Ceramic component

Abstract

To provide a ceramic component capable of improving migration suppressing properties.SOLUTION: A ceramic component 1 includes: a ceramic body 10; a plurality of internal electrodes disposed inside the ceramic body 10; a first external electrode 21 disposed on a first end surface S11 and extending from the first end surface S11 to cover a part of a first side surface S21; a second external electrode 22 disposed on a second end surface S12 and extending from the second end surface S12 to cover a part of the first side surface S21; and a third external electrode 23 disposed on the first side surface S21 and extending from the first side surface S21 to cover a part of a first main surface S31 and a part of a second main surface S32. The ceramic body 10 contains a particular element that is at least one of alkali metal and alkaline earth metal. In a surface layer of the first side surface S21, a first total concentration of the particular element in a vicinity N1 of the first external electrode and in a vicinity N2 of the second external electrode is different from a second total concentration of the particular element in a vicinity N3 of the third external electrode.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a ceramic component, and more particularly to a ceramic component including a ceramic body. [Background technology]

[0002] Various ceramic components such as varistors are used in various electronic devices, electronic equipment, etc. Varistors are used to protect various electronic devices, electronic equipment, etc. from abnormal voltages caused by lightning surges, static electricity, etc., and to prevent malfunctions of electronic devices, electronic equipment, etc. caused by noise generated in circuits.

[0003] Patent Document 1 discloses a chip varistor. This chip varistor comprises an element body having a laminated structure, first and second conductors extending within the element body, a third conductor positioned intermediate the first and second conductors and extending to form a first functional layer and a second functional layer, a first electrode, a second electrode, and a third electrode connected to the conductors, respectively, and an alkali metal-containing portion that constitutes the surface of the element body and extends from the surface of the element body inward along the interface between the conductors and the element body, the alkali metal-containing portion having increased electrical resistance by containing an alkali metal, the alkali metal-containing portion constituting the surface of the element body and extending inward from the surface of the element body along the interface between the conductors and the element body, the alkali metal-containing portion not reaching the first or second functional layer. In this chip varistor, the electrical resistance is increased by having the alkali metal present along the entire outer surface of the element body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-096075 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in conventional ceramic components, such as the chip varistor of Patent Document 1, if alkali metal is present on the entire outer surface of the ceramic body, migration may occur on the surface of the ceramic body.

[0006] An object of the present disclosure is to provide a ceramic component that can improve migration suppression properties. [Means for solving the problem]

[0007] A ceramic component according to one aspect of the present disclosure includes a ceramic body having a first end face and a second end face opposing each other in a first direction, a first side face and a second side face opposing each other in a second direction, and a first main face and a second main face opposing each other in a third direction; a plurality of internal electrodes disposed inside the ceramic body; a first external electrode disposed on the first end face, wrapping around from the first end face side and covering a portion of the first side face; a second external electrode disposed on the second end face, wrapping around from the second end face side and covering a portion of the first side face; and a third external electrode disposed on the first side face, wrapping around from the first side face side and covering a portion of the first main face and a portion of the second main face. The ceramic body includes a specific element that is at least one of an alkali metal and an alkaline earth metal. In a surface layer of the first side face, a first total concentration of the specific element near the first external electrode and the second external electrode is different from a second total concentration of the specific element near the third external electrode. [Effects of the Invention]

[0008] According to the ceramic part of the present disclosure, migration suppression can be improved. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic perspective view showing an example of the ceramic part of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] 1. Overview The ceramic part 1 will now be outlined with reference to the drawings. Note that the drawings are schematic diagrams, and the ratios of the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensional ratios.

[0011] In the following description, the X-axis direction parallel to the long side direction of the ceramic body 10 is defined as the first direction, the Y-axis direction as the second direction, and the Z-axis direction as the third direction, as shown in Fig. 1. However, these directions are merely examples and are not intended to limit the directions in which the ceramic component 1 may be used.

[0012] Through extensive research to solve the above-mentioned problems, the inventors discovered that there is a relationship between the distribution of concentrations of a specific element, which is at least one of an alkali metal and an alkaline earth metal, and various characteristics of a ceramic component, and thus completed the present disclosure.

[0013] The "specific element" includes alkali metals such as lithium, sodium, potassium, rubidium, cesium, etc., and alkaline earth metals such as beryllium, magnesium, calcium, strontium, barium, etc. Among these, sodium, potassium, magnesium, and calcium are preferred.

[0014] As shown in FIG. 1, the ceramic component 1 of this embodiment includes a ceramic body 10, a plurality of internal electrodes (not shown), and a plurality of external electrodes, namely, a first external electrode 21, a second external electrode 22, and a third external electrode 23.

[0015] The ceramic body 10 has a first end face S11 and a second end face S12 that face each other in a first direction (X-axis direction), a first side face S21 and a second side face S22 that face each other in a second direction (Y-axis direction), and a first main face S31 and a second main face S32 that face each other in a third direction (Z-axis direction).

[0016] The first external electrode 21 is provided on the first end face S11 and wraps around from the first end face S11 side to cover a part of the first side face S21. The second external electrode 22 is provided on the second end face S12 and wraps around from the second end face S12 side to cover a part of the first side face S21. The third external electrode 23 is provided on the first side face S21 and wraps around from the first side face S21 side to cover a part of the first main face S31 and a part of the second main face S32. In this way, the first external electrode 21 and the second external electrode 22 are external electrodes (hereinafter also referred to as end surface electrodes) provided on the end surfaces S11, S12 of the ceramic body 10, and the third external electrode 23 is an external electrode (hereinafter also referred to as side surface electrode) provided on the side surface S21 of the ceramic body 10.

[0017] 1, the ceramic body 10 has, as regions near the external electrodes, a first external electrode neighborhood N1 near the first external electrode 21, which is an end surface electrode, and a second external electrode neighborhood N2 near the second external electrode 22. It also has a third external electrode neighborhood N3 near the third external electrode 23, which is a side electrode. The "near the external electrode" refers to a region of the ceramic body that is within 50 μm of the end of the external electrode in the first direction (X-axis direction).

[0018] In the ceramic component 1 of this embodiment, the ceramic body 10 contains a specific element, and in the surface layer of the first side surface S21, a first total concentration of the specific element in the vicinity of the first external electrode N1 and the vicinity of the second external electrode N2 is different from a second total concentration of the specific element in the vicinity of the third external electrode 23 N3. That is, the concentration of the specific element in the surface layer of the first side surface S21 of the ceramic component 1 is different between the concentration near the end electrode (first total abundance concentration) and the concentration near the side electrode (second total abundance concentration).

[0019] The "surface layer" refers to a region whose depth from the surface is within the detection depth of an EPMA (Electron Probe Micro Analyzer). EPMA is a measuring device that analyzes constituent elements based on the wavelength and intensity of characteristic X-rays generated by irradiating an object with an electron beam. The detection depth is usually in the range of 0.1 μm to 10 μm, preferably 0.5 μm to 2 μm, and more preferably 1 μm.

[0020] The "total concentration" of a specific element refers to the total concentration of the specific element in the surface layer of the first side surface S21 and in the vicinity of the external electrode, and the "total concentration" refers to the percentage (wt%) of the total weight of the specific element relative to the weight of the ceramic body in a certain volume. The "total concentration" can be approximated by calculating, for example, the percentage of the total peak area of ​​the specific element relative to the peak area of ​​the Zn element of ZnO, the main component of the ceramic body, in EPMA measurement (total peak area of ​​the specific element × 100 / peak area of ​​the Zn element). The term "different total concentrations" means that the first total concentration and the second total concentration differ from each other by 5 wt% or more.

[0021] In the ceramic component 1 of this embodiment, the first total abundance concentration and the second total abundance concentration are different, that is, the concentration near the end electrode is different from the concentration near the side electrode, thereby improving migration suppression. The reason why the ceramic component 1 of this embodiment has the above configuration and exhibits the above effect is thought to be, for example, that the total abundance of the specific element is reduced by making the specific element locally present near the external electrode.

[0022] Furthermore, as will be described later, the ceramic component 1 of this embodiment can achieve both improved migration suppression and improved properties such as sealing ability, suppression of plating runaway, and moisture resistance, depending on the magnitude of the concentration near the end electrode and the concentration near the side electrode, the concentration of specific elements in specific regions, etc.

[0023] 2.Details <Ceramic parts> The ceramic component 1 according to the present disclosure includes a ceramic body 10, a plurality of internal electrodes, and a plurality of external electrodes, including a first external electrode 21, a second external electrode 22, and a third external electrode 23. As shown in FIG. 1 , the ceramic component 1 typically includes a fourth external electrode 24 that is provided on the second side surface S22, wraps around from the second side surface S22, and covers a portion of the first main surface S31 and a portion of the second main surface S32. Alternatively, the third external electrode 23 and the fourth external electrode 24 in FIG. 1 may be connected to each other on the first main surface S31 and the second main surface S32, and may surround the ceramic body 10. The ceramic component 1 may also include plated electrodes that are provided to cover at least a portion of the surface of each of the external electrodes 21, 22, 23, and 24.

[0024] Examples of the ceramic part 1 of the present disclosure include a varistor, a thermistor, a ceramic capacitor, etc. Below, an example will be described in which the ceramic part 1 of the present disclosure is a varistor 1.

[0025] [Ceramic body] The shape of the ceramic body 10 in the varistor 1 of this embodiment is, for example, a rectangular parallelepiped with the longer sides in the first direction (X-axis direction). The dimensions of the ceramic body 10 are, for example, a length in the first direction (X-axis direction) of 0.6 to 1.6 mm, a length (width) in the second direction (Y-axis direction) of 0.3 to 0.8 mm, and a length (height) in the third direction (Z-axis direction) of 0.3 to 0.8 mm. The corners of the ceramic body 10 may be chamfered as appropriate, or may be rounded.

[0026] In the varistor 1, the ceramic body 10 is made of, for example, a semiconductor ceramic component having nonlinear resistance characteristics. The ceramic body 10 usually contains ZnO as the main component and Bi2O3, Co2O3, MnO2, Sb2O3, and Pr6O as secondary components. 11, CaCO3, Cr2O3, etc. The ceramic body 10 is formed by sintering a main component such as ZnO with a part of the secondary component in the semiconductor ceramic component to form a solid solution, and then precipitating the remaining secondary component at the grain boundaries.

[0027] With regard to the concentration of a specific element in the surface layer of the first side surface S21 of the varistor 1 of this embodiment, a first total concentration in the vicinity of the first external electrode N1 and the second external electrode N2 is different from a second total concentration in the vicinity of the third external electrode N3. In this case, the varistor 1 can improve its migration suppression properties.

[0028] The specific elements present in the vicinity of the external electrodes N1 to N4 in the ceramic body 10 have diffused into the ceramic body 10 from the external electrode paste, for example, during the firing process that forms the external electrodes during the manufacturing process of the varistor 1. Therefore, the first total concentration and second total concentration of the specific elements can be adjusted between the end electrode and the side electrode by, for example, (1) changing the number of times the external electrode paste is applied or fired, (2) changing the firing temperature, time, etc., or (3) using external electrode pastes with different concentrations of the specific elements.

[0029] The ceramic body 10 may have an insulating layer on its surface. That is, a high-resistance region may be formed in a layered form on the surface of the ceramic body 10. In this case, the ceramic body 10 contains a specific element on its surface to form an insulating layer, thereby further improving migration suppression.

[0030] [Internal electrode] A plurality of internal electrodes are arranged inside the ceramic body 10. The number of internal electrodes in the varistor 1 in Fig. 1 is, for example, three, and the three internal electrodes are electrically connected to a first external electrode 21 and a second external electrode 22, which are end electrodes, and a third external electrode 23 and a fourth external electrode 24, which are side electrodes.

[0031] The internal electrodes contain metals such as Ag, Pd, PdAg, PtAg, etc. The ceramic element 10 having internal electrodes therein can be produced by applying, for example, by printing, an internal electrode paste containing the above metal to ceramic sheets produced using, for example, a slurry containing ZnO, stacking, pressing, and cutting the obtained ceramic sheets, removing the binder at a temperature of, for example, 300°C or higher and 500°C or lower, and then firing, for example, at a temperature of 600°C or higher and 1100°C or lower.

[0032] [External electrode] As shown in FIG. 1, the varistor 1 comprises a first external electrode 21 and a second external electrode 22 as end surface electrodes, and a third external electrode 23 and a fourth external electrode 24 as side surface electrodes.

[0033] The first external electrode 21 is provided on the first end face S11 and wraps around from the first end face S11 side to cover a portion of the first side face S21. The second external electrode 22 is provided on the second end face S12 and wraps around from the second end face S12 side to cover a portion of the first side face S21. The third external electrode 23 is provided on the first side face S21 and wraps around from the first side face S21 side to cover a portion of the first main face S31 and a portion of the second main face S32. The fourth external electrode 24 is provided on the second side face S22 and wraps around from the second side face S22 side to cover a portion of the first main face S31 and a portion of the second main face S32.

[0034] The external electrodes 21, 22, 23, and 24 are formed by applying an external electrode paste containing a metal component such as Ag, AgPd, or AgPt and a glass component such as Bi2O3, SiO2, or B2O3 by dipping, printing, or the like so as to cover, for example, the side surfaces S11 and S12, the side surfaces S21 and S22, and parts of the main surfaces S31 and S32 of the ceramic body 10, and then baking the paste at a temperature of, for example, 700°C or higher and 800°C or lower.

[0035] [Plating electrode] The plating electrodes are provided so as to cover at least a portion of each of the external electrodes 21, 22, 23, and 24. The plating electrodes include, for example, Ni electrodes provided so as to cover at least a portion of each of the external electrodes, and Sn electrodes provided so as to cover at least a portion of each of the Ni electrodes.

[0036] It is believed that the ceramic component 1 of this embodiment, such as a thermistor or ceramic capacitor other than the varistor 1, can also have improved migration suppression properties.

[0037] First to third embodiments of the ceramic part 1 will be described below. [First embodiment] In the ceramic component 1 of the first embodiment, the second total abundance concentration is greater than the first total abundance concentration. That is, the concentration of the specific element near the side electrode is greater than the concentration near the end electrode. Methods for making the concentration near the side electrode greater than the concentration near the end electrode in this way include, for example, (A) making the concentration (wt %) of the specific element in the external electrode paste used higher for the side electrode than for the end electrode, (B) baking the external electrodes more times for the side electrode than for the end electrode, and (C) baking the external electrodes at a higher temperature and / or for a longer time for the side electrode than for the end electrode.

[0038] The ceramic component 1 of the first embodiment not only has the above-described improved migration suppression capability, but also has the effect of improving sealing performance against plating solutions, flux during mounting, and the like, and also improving plating run suppression capability. In other words, the ceramic component 1 of the first embodiment can achieve both improved migration suppression capability and improved sealing performance and plating run suppression capability.

[0039] This effect of improved sealing is thought to be due to the presence of a large amount of glass formed from specific elements near the side electrodes, which would normally be at a disadvantage in sealing, thereby improving sealing against plating solution, flux during mounting, etc. Also, the effect of improved plating flow suppression is thought to be due to the presence of a larger amount of specific elements that do not have free electrons near the side electrodes, which would normally be prone to plating flow, preventing Ni ions and Sn ions in the plating solution from receiving electrons near the external electrodes.

[0040] The second total concentration is preferably 1.2 times or more the first total concentration. In this case, migration suppression, sealing properties, and plating run suppression properties can be further improved. The second total concentration is more preferably 1.4 times or more the first total concentration, even more preferably 1.5 times or more, and particularly preferably 1.7 times or more. The upper limit of the second total concentration is not particularly limited, but is, for example, 3.0 times or less, and preferably 2.0 times or less.

[0041] [Second embodiment] In the ceramic part 1 of the second embodiment, the first total abundance concentration is greater than the second total abundance concentration, that is, the concentration of the specific element near the end surface electrode is greater than the concentration near the side surface electrode.

[0042] The ceramic component 1 of the second embodiment has the effect of improving moisture resistance in addition to the above-mentioned improvement in migration suppression. In other words, the ceramic component 1 of the second embodiment can achieve both improvement in migration suppression and improvement in moisture resistance.

[0043] This effect of improving moisture resistance is thought to be due to the fact that surface insulation deterioration during a moisture load test starts near the end electrode, and by having a large amount of glass containing specific elements near this end electrode, the starting point of this surface deterioration is protected.

[0044] The first total concentration is preferably 1.2 times or more the second total concentration. In this case, migration suppression and moisture resistance can be further improved. The first total concentration is more preferably 1.4 times or more the second total concentration, even more preferably 1.5 times or more, and particularly preferably 1.7 times or more. There is no particular limit to the upper limit of the first total concentration, but it is, for example, 3.0 times or less, and preferably 2.0 times or less.

[0045] [Third embodiment] In the ceramic component 1 of the third embodiment, the ceramic body 10 has specific ridge portions between the first side face S21 and the first main surface S31 and between the first side face S21 and the second main surface S32. In the ceramic component 1 of the third embodiment, the total concentration of the specific element at the specific ridge portions is higher than the total concentration of the specific element in the surface layer of the first side face S21. That is, in the ceramic component 1 of the third embodiment, the concentration of the specific element at the ridge portion between the first side face S21 and the first main surface S31 and at the ridge portion between the first side face S21 and the second main surface S32 in the ceramic body 10 is higher than the concentration in the entire surface layer of the first side face S21. The "ridge portion" refers to a region of the ceramic body 10 that is within 50 μm of an edge where the plane including the first side face S21 intersects with the plane including the first main surface S31 or the second main surface S32, and that is a surface layer.

[0046] The ceramic part 1 of the third embodiment has the effect of improving the above-mentioned migration suppression property, as well as improving the plating wash suppression property. In other words, the ceramic part 1 of the third embodiment can achieve both improved migration suppression property and improved plating wash suppression property.

[0047] The effect of achieving both this migration suppression and plating flow suppression is thought to be achieved by, for example, having a large amount of a specific element present at the edge of the element, since migration is likely to occur on the surface of the element and plating flow is likely to occur at the edge of the element. [Example]

[0048] The present disclosure will be specifically described below using examples, but the present disclosure is not limited to these examples.

[0049] <Ceramic parts manufacturing> A ceramic body containing ZnO as the main component was formed, and an insulating layer made of SiO was formed as the surface layer of this ceramic body. Then, an external electrode paste was applied to the surface of this insulating layer and baked, thereby producing the ceramic parts of Examples 1 and 2 and Comparative Example 1. Example 1 In the ceramic part of Example 1, the side electrodes contained glass frit containing K, and Ag paste containing 0.45 wt% of K was used. The end electrodes contained glass frit containing K, and Ag paste containing 0.225 wt% of K was used. These Ag pastes were applied to the side and end surfaces, respectively, and dried, and then baked at 700°C for 6 minutes (heating rate: 30°C / min). Example 2 For the ceramic part of Example 2, the side electrodes were formed by applying the same external electrode paste for the side electrodes as in Example 1 to the side surfaces and then baking at 700°C for 6 minutes (heating rate: 30°C / min), and then applying the same external electrode paste as for the side electrodes to the end surfaces and then baking under the same conditions as for baking the side electrodes to form the end electrodes. That is, in Example 2, the side electrodes were manufactured by using an external electrode paste with a high glass component and baking twice under conditions with a long baking time, and the end electrodes were manufactured by baking once under the same conditions. (Comparative Example 1) The ceramic part of Comparative Example 1 was manufactured by applying the same external electrode paste containing Ag powder but not the specific element to the side and end faces, and then baking the paste.

[0050] <Evaluation> [Alkali metals / alkaline earth metals / Zn ratio] Using an EPMA measuring device, specific elements (K element) and Zn element were measured near the side electrode and near the end electrode of each ceramic part, and the alkali metal / alkaline earth metal / Zn ratio (wt%) was determined by calculating the peak area ratio.

[0051] [Plating flow rate (%)] Regarding plating flow, the state of occurrence of plating flow on the surface of the ceramic part after plating was observed using a metallurgical microscope, and the occurrence rate (%) of plating flow per n=1000 was calculated.

[0052] The alkali metal / alkaline earth metal / Zn ratio near the side electrode and near the end electrode, the near the side electrode / near the end electrode ratio, and the plating flow rate (%) measured for the ceramic parts of Example 1, Example 2, and Comparative Example 1 are shown in Table 1 below.

[0053] [Table 1]

[0054] As is clear from the results in Table 1, the ceramic parts of Examples 1 and 2 have improved plating flow suppression properties compared to the ceramic part of Comparative Example 1.

[0055] (summary) As is clear from the above embodiments, the present disclosure includes the following aspects. In the following, reference numerals are given in parentheses only to clarify the correspondence with the embodiments.

[0056] The ceramic part (1) of the first aspect includes a ceramic body (10) having a first end face (S11) and a second end face (S12) facing each other in a first direction (X-axis direction), a first side face (S21) and a second side face (S22) facing each other in a second direction (Y-axis direction), and a first main face (S31) and a second main face (S32) facing each other in a third direction (Z-axis direction), a plurality of internal electrodes arranged inside the ceramic body (10), and a first end face (S11) and a second end face (S12) facing each other in a first direction (X-axis direction). The ceramic body (10) includes a first external electrode (21) provided on the first main surface (S11) and extending from the first end surface (S11) to cover a portion of the first side surface (S21), a second external electrode (22) provided on the second end surface (S12) and extending from the second end surface (S12) to cover a portion of the first side surface (S21), and a third external electrode (23) provided on the first side surface (S21) and extending from the first side surface (S21) to cover a portion of the first main surface (S31) and a portion of the second main surface (S32). The ceramic body (10) includes a specific element that is at least one of an alkali metal and an alkaline earth metal. In a surface layer of the first side surface (S21), a first total concentration of the specific element near the first external electrode (N1) and the second external electrode (N2) is different from a second total concentration of the specific element near the third external electrode (N3).

[0057] According to the first aspect, the ceramic part (1) can have improved migration suppression properties.

[0058] In the ceramic part (1) of the second embodiment, the second total concentration is greater than the first total concentration in the first embodiment.

[0059] According to the second aspect, the ceramic part (1) can achieve both improved migration suppression and improved sealing and plating run suppression.

[0060] In the ceramic part (1) of the third aspect, in the second aspect, the second total concentration is 1.2 times or more the first total concentration.

[0061] According to the third aspect, the ceramic part (1) can further improve migration suppression, sealing properties, and plating flow suppression properties.

[0062] In the ceramic part (1) of the fourth aspect, the first total concentration is greater than the second total concentration in the first aspect.

[0063] According to the fourth aspect, the ceramic part (1) can achieve both improved migration suppression and improved moisture resistance.

[0064] In the ceramic part (1) of the fifth aspect, in the fourth aspect, the first total concentration is 1.2 times or more the second total concentration.

[0065] According to the fifth aspect, the ceramic part (1) can have further improved migration suppression and moisture resistance.

[0066] In a ceramic part (1) of a sixth aspect, in any one of the first to fifth aspects, the ceramic body (10) has specific ridge lines between the first side face (S21) and the first main face (S31) and between the first side face (S21) and the second main face (S32), and the total concentration of the specific element in the specific ridge lines is greater than the total concentration of the specific element in a surface layer of the first side face (S21).

[0067] According to the sixth aspect, the ceramic part (1) can achieve both improved migration suppression and improved plating run suppression.

[0068] The ceramic part (1) of the seventh aspect is the ceramic part (1) of any one of the first to sixth aspects, in which the ceramic body (10) has an insulating layer on the surface thereof.

[0069] According to the seventh aspect, the ceramic part (1) can further improve the migration suppression property. [Explanation of symbols]

[0070] 1. Ceramic parts (varistors) 10 Ceramic element 21 1st external electrode 22 2nd external electrode 23 Third external electrode 24 4th external electrode S11 1st end surface S12 2nd end face S21 1st side S22 2nd side S31 First main surface S32 Second main surface N1 Near the first external electrode N2 Near the second external electrode N3 Near the third external electrode N4 Near the fourth external electrode

Claims

1. a ceramic body having a first end face and a second end face opposing each other in a first direction, a first side face and a second side face opposing each other in a second direction, and a first main face and a second main face opposing each other in a third direction; a plurality of internal electrodes disposed inside the ceramic body; a first external electrode provided on the first end surface, extending from the first end surface side to cover a portion of the first side surface; a second external electrode provided on the second end surface, extending from the second end surface side to cover a portion of the first side surface; a third external electrode provided on the first side surface, wrapping around from the first side surface side, and covering a part of the first main surface and a part of the second main surface; Equipped with the ceramic body contains a specific element that is at least one of an alkali metal and an alkaline earth metal, In the surface layer of the first side surface, a first total concentration of the specific element in the vicinity of the first external electrode and the vicinity of the second external electrode is different from a second total concentration of the specific element in the vicinity of the third external electrode; Ceramic parts.

2. The second total concentration is greater than the first total concentration. The ceramic part of claim 1.

3. The second total concentration is 1.2 times or more the first total concentration. The ceramic part of claim 2.

4. The first total concentration is greater than the second total concentration. The ceramic part of claim 1.

5. The first total concentration is 1.2 times or more the second total concentration. The ceramic part according to claim 4.

6. the ceramic body has specific ridge lines between the first side surface and the first main surface and between the first side surface and the second main surface, the total concentration of the specific element in the specific edge portion is greater than the total concentration of the specific element in the surface layer of the first side surface; The ceramic part of claim 1.

7. The ceramic body has an insulating layer on its surface. The ceramic part of claim 1.

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