Dielectric composition, dielectric element, and laminated electronic component

Abstract

This dielectric composition contains a strontium component, a sodium component, a niobium component, a calcium component, an yttrium component, and a zirconium component, and the molar ratios (%) of the components in the dielectric composition in terms of oxides are 14.7 < = strontium component < = 20.7, 13.5 < = sodium component < = 23.5, 60.1 < = niobium component < = 63.2, 0.66 < = calcium component < = 2.93, 0.53 < = yttrium component < = 2.23, and 0.48 < = zirconium component < = 2.27.

Description

Technical Field

[0001] The present invention relates to a dielectric composition, a dielectric element, and a multilayer electronic component. Background Art

[0002] A dielectric capacitor (e.g., a multilayer ceramic capacitor) is a capacitor having a dielectric layer formed of a dielectric composition and is used as a main component in various electronic devices such as home electric appliances and automotive control devices. In such a dielectric capacitor, for example, a capacitor for a power transmission system of an electric vehicle is applied with a high voltage (e.g., 400V to 800V) as the battery voltage increases, and thus high withstand voltage (non-destruction against the applied high voltage) is required, and a high relative dielectric constant is maintained under a high electric field. In addition, for such a dielectric capacitor, in addition to high withstand voltage and high relative dielectric constant under a high electric field, a large electrostatic capacitance (i.e., large capacity) is also required.

[0003] In addition, as shown in Patent Document 1, in an environment where a high voltage is applied, in order to obtain a large electrostatic capacitance, a small change (reduction amplitude) in the relative dielectric constant when a DC voltage is applied is required.

[0004] Conventionally, as a dielectric capacitor, a dielectric composition containing BaTiO3 having a high dielectric constant has been used, but the relative dielectric constant of the dielectric composition containing BaTiO3 is significantly reduced under a high electric field. Therefore, for example, it has been proposed to use a dielectric composition having a tungsten bronze type structure as shown in Patent Document 1 in a dielectric capacitor.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: WO 2017 / 163845 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] For a conventional dielectric composition having a tungsten bronze type structure, although the change (reduction amplitude) in the relative dielectric constant is small, it cannot be said that the relative dielectric constant under a high electric field is sufficiently high, which is a problem.

[0010] An object of the present invention is to provide a dielectric composition etc. having a small reduction amplitude in the relative dielectric constant before and after application of a DC high voltage and a high relative dielectric constant under a high electric field.

[0011] Means for Solving the Problems

[0012] Means for solving the above problems are as follows.

[0013] That is, <1> A dielectric composition, which is a dielectric composition containing a strontium component, a sodium component, a niobium component, a calcium component, a yttrium component, and a zirconium component, wherein the molar ratio (%) of each component in the above dielectric composition in terms of oxide conversion is:

[0014] 14.7 ≤ strontium component ≤ 20.7,

[0015] 13.5 ≤ sodium component ≤ 23.5,

[0016] 60.1 ≤ niobium component ≤ 63.2,

[0017] 0.66 ≤ calcium component ≤ 2.93,

[0018] 0.53 ≤ yttrium component ≤ 2.23,

[0019] 0.48 ≤ zirconium component ≤ 2.27.

[0020] In this way, an effect can be obtained that the relative dielectric constant at 8 kV / mm is 600 or more, and the change rate of the relative dielectric constant from 0 kV / mm to 8 kV / mm is greater than -41%.

[0021] <2> The dielectric composition according to the above <1>, which contains a strontium component, a sodium component, a niobium component, a calcium component, a yttrium component, and a zirconium component, wherein the molar ratio (%) of each component in the above dielectric composition in terms of oxide conversion is:

[0022] 14.7 ≤ strontium component ≤ 20.7,

[0023] 14.2 ≤ sodium component ≤ 23.5,

[0024] 60.1 ≤ niobium component ≤ 63.2,

[0025] 0.66 ≤ calcium component ≤ 1.56,

[0026] 0.53 ≤ yttrium component ≤ 1.25,

[0027] 0.48 ≤ zirconium component ≤ 1.24.

[0028] In this way, an effect can be obtained that the relative dielectric constant at 8 kV / mm is 700 or more, and the change rate of the relative dielectric constant from 0 kV / mm to 8 kV / mm is greater than -41%.

[0029] <3> The dielectric composition according to the above <1>, which is a dielectric composition containing a strontium component, a sodium component, a niobium component, a calcium component, a yttrium component, and a zirconium component, wherein the molar ratio (%) of each component in the above dielectric composition in terms of oxide conversion is:

[0030] 16.8 ≤ strontium component ≤ 20.4,

[0031] 13.5 ≤ sodium component ≤ 14.3,

[0032] 61.7 ≤ niobium component ≤ 63.1,

[0033] 1.21 ≤ calcium component ≤ 2.93,

[0034] 1.09 ≤ yttrium component ≤ 2.23,

[0035] 1.00 ≤ zirconium component ≤ 2.27.

[0036] In this way, an effect can be obtained that the relative permittivity at 8 kV / mm is 600 or more, and the change rate of the relative permittivity from 0 kV / mm to 8 kV / mm is -5.9% or more.

[0037] <4> The dielectric composition according to <1> above, wherein the molar ratio (%) of each of the above components in terms of oxide conversion is:

[0038] 14.7 ≤ strontium component ≤ 20.7,

[0039] 14.3 ≤ sodium component ≤ 23.5,

[0040] 60.1 ≤ niobium component ≤ 63.2,

[0041] 0.66 ≤ calcium component ≤ 0.76,

[0042] 0.53 ≤ yttrium component ≤ 0.59,

[0043] 0.48 ≤ zirconium component ≤ 0.59.

[0044] <5> The dielectric composition according to <1> above, wherein the molar ratio (%) of each of the above components in terms of oxide conversion is:

[0045] 18.2 ≤ strontium component ≤ 20.7,

[0046] 14.3 ≤ sodium component ≤ 17.3,

[0047] 62.6 ≤ niobium component ≤ 63.2,

[0048] 0.67 ≤ calcium component ≤ 0.76,

[0049] 0.53 ≤ yttrium component ≤ 0.55,

[0050] 0.49 ≤ zirconium component ≤ 0.59.

[0051] <6>A dielectric element includes a dielectric ceramic formed from the dielectric composition according to any one of <1> to <5> above and an electrode mounted on the dielectric ceramic.

[0052] <7>A multilayer electronic component includes a laminate in which dielectric layers and internal electrode layers formed from the dielectric composition according to any one of <1> to <5> above are alternately laminated.

[0053] Advantages of the Invention

[0054] According to the present invention, it is possible to provide a dielectric composition etc. having a small reduction in relative permittivity before and after application of a high DC voltage and a high relative permittivity under a high electric field. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a perspective view of the dielectric element.

[0056] Figure 2 is a cross-sectional view of the multilayer electronic component. DETAILED DESCRIPTION

[0057] Hereinafter, the dielectric composition, the dielectric element, and the multilayer electronic component according to the embodiments will be described.

[0058] The dielectric composition is a sintered body of a ceramic containing a strontium component, a sodium component, a niobium component, a calcium component, a yttrium component, and a zirconium component.

[0059] The molar ratio (%) in terms of oxide conversion of each component in the above dielectric composition is 14.7 ≤ strontium component ≤ 20.7, 14.3 ≤ sodium component ≤ 23.5, 60.1 ≤ niobium component ≤ 63.2, 0.656 ≤ calcium component ≤ 0.763, 0.531 ≤ yttrium component ≤ 0.586, 0.483 ≤ zirconium component ≤ 0.589.

[0060] The molar ratio (%) in terms of oxide conversion is a value expressed as a molar ratio (%) of the amount of the oxide of each component contained in the above dielectric composition when the total amount of the oxide is assumed to be 100 mol% in the case where the above dielectric composition is completely decomposed and changed to an oxide.

[0061] The strontium component (hereinafter sometimes referred to as "Sr component") exists in the dielectric composition in the form of an oxide, an ion, etc.

[0062] In the dielectric composition, the molar ratio (%) in terms of oxide conversion (SrO conversion) of the Sr component is 14.7 or more and 20.7 or less.

[0063] As a raw material for the Sr component, compounds that can become the Sr component through firing can be cited. As compounds that can become the above Sr component, for example, various inorganic powders such as oxides of Sr, composite oxides of Sr, hydroxides of Sr, carbonates of Sr, chlorides of Sr, sulfates of Sr, nitrates of Sr, and phosphates of Sr can be cited. Specifically, strontium carbonate powder can be cited. It should be noted that the usage amount of the compounds that can become the above Sr component is grasped by the molar ratio (%) in terms of oxide conversion (SrO conversion).

[0064] The sodium component (hereinafter sometimes referred to as "Na component") exists in the dielectric composition in the form of oxides, ions, etc.

[0065] In the dielectric composition, the molar ratio (%) of the Na component in terms of oxide conversion (NaO 0.5 conversion) is 14.3 or more and 23.5 or less.

[0066] As a raw material for the Na component, compounds that can become the Na component through firing can be cited. As compounds that can become the above Na component, for example, various inorganic powders such as oxides of Na, composite oxides of Na, hydroxides of Na, carbonates of Na, chlorides of Na, sulfates of Na, nitrates of Na, and phosphates of Na can be cited. Specifically, sodium carbonate powder can be cited. It should be noted that the usage amount of the compounds that can become the above Na component is grasped by the molar ratio (%) in terms of oxide conversion (NaO 0.5 conversion).

[0067] The niobium component (hereinafter sometimes referred to as "Nb component") exists in the dielectric composition in the form of oxides, ions, etc.

[0068] In the dielectric composition, the molar ratio (%) of the Nb component in terms of oxide conversion (NbO 2.5 conversion) is 60.1 or more and 63.2 or less.

[0069] As a raw material for the Nb component, compounds that can become the Nb component through firing can be cited. As compounds that can become the above Nb component, for example, various inorganic powders such as oxides of Nb, composite oxides of Nb, hydroxides of Nb, carbonates of Nb, chlorides of Nb, sulfates of Nb, nitrates of Nb, and phosphates of Nb can be cited. Specifically, niobium oxide powder can be cited. It should be noted that the usage amount of the compounds that can become the above Nb component is grasped by the molar ratio (%) in terms of oxide conversion (NbO 2.5 conversion).

[0070] The calcium component (hereinafter sometimes referred to as "Ca component") exists in the dielectric composition in the form of oxides, ions, etc.

[0071] In the dielectric composition, the molar ratio (%) of the Ca component in terms of oxide conversion (CaO conversion) is 0.656 or more and 0.763 or less.

[0072] As a raw material for the Ca component, compounds that can become the Ca component through firing can be cited. As compounds that can become the above-mentioned Ca component, for example, various inorganic powders such as oxides of Ca, composite oxides of Ca, hydroxides of Ca, carbonates of Ca, chlorides of Ca, sulfates of Ca, nitrates of Ca, and phosphates of Ca can be cited. Specifically, calcium carbonate powder can be cited. It should be noted that the usage amount of the compounds that can become the above-mentioned Ca component is grasped by the molar ratio (%) in terms of oxide conversion (CaO conversion).

[0073] The yttrium component (hereinafter sometimes referred to as "Y component") exists in the dielectric composition in the form of oxides, ions, etc.

[0074] In the dielectric composition, the molar ratio (%) of the Y component in terms of oxide conversion (YO 1.5 conversion) is 0.531 or more and 0.586 or less.

[0075] As a raw material for the Y component, compounds that can become the Y component through firing can be cited. As compounds that can become the above-mentioned Y component, for example, various inorganic powders such as oxides of Y, composite oxides of Y, hydroxides of Y, carbonates of Y, chlorides of Y, sulfates of Y, nitrates of Y, and phosphates of Y can be cited. Specifically, yttrium oxide powder can be cited. It should be noted that the usage amount of the compounds that can become the above-mentioned Y component is grasped by the molar ratio (%) in terms of oxide conversion (YO 1.5 conversion).

[0076] The zirconium component (hereinafter sometimes referred to as "Zr component") exists in the dielectric composition in the form of oxides, ions, etc.

[0077] In the dielectric composition, the molar ratio (%) of the Zr component in terms of oxide conversion (ZrO2 conversion) is 0.483 or more and 0.589 or less.

[0078] As a raw material for the Zr component, compounds that can be converted into the Zr component by firing can be cited. As the compounds that can become the above Zr component, for example, various inorganic powders such as oxides of Zr, composite oxides of Zr, hydroxides of Zr, carbonates of Zr, chlorides of Zr, sulfates of Zr, nitrates of Zr, and phosphates of Zr can be cited. Specifically, zirconia powder can be cited. It should be noted that the usage amount of the compounds that can become the above Zr component is grasped by the molar ratio (%) in terms of oxide conversion (ZrO2 conversion).

[0079] As long as the object of the present invention is not impaired, the dielectric composition may also contain elements other than the strontium component, sodium component, niobium component, calcium component, yttrium component, and zirconium component at a ratio of 1000 ppm or less as inevitable impurities.

[0080] In addition, the manufacturing method of the dielectric composition will be appropriately described in the description of each manufacturing method of the dielectric element and the multilayer electronic component described later.

[0081] In the dielectric composition, when the molar ratio (%) of each of the strontium component, sodium component, niobium component, calcium component, yttrium component, and zirconium component in terms of oxide conversion is within the above range, the relative dielectric constant under a high electric field (8 kV / mm) is 900 or more, and the reduction rate of the relative dielectric constant before and after applying a DC high voltage is greater than -41%, and the reduction amplitude of the relative dielectric constant is suppressed to be small.

[0082] It should be noted that in the above dielectric composition, the relative dielectric constant in the state where no electric field is applied (0 kV / mm) is not particularly limited as long as the object of the present invention is not impaired, and it is preferably 1400 or more, more preferably 1500 or more.

[0083] In particular, in the dielectric composition, the molar ratio (%) of each of the above components in terms of oxide conversion is preferably 18.2 ≤ strontium component ≤ 20.1, 15.0 ≤ sodium component ≤ 17.3, 62.6 ≤ niobium component ≤ 63.1, 0.756 ≤ calcium component ≤ 0.763, 0.536 ≤ yttrium component ≤ 0.549, 0.489 ≤ zirconium component ≤ 0.548. When the molar ratio (%) of each of the above components is within such a range, the relative dielectric constant under a high electric field (8 kV / mm) is 1000 or more, and the reduction rate of the relative dielectric constant before and after applying a DC high voltage is -35% or more, and the reduction amplitude of the relative dielectric constant is suppressed to be even smaller.

[0084] Next, with reference to Figure 1 , a dielectric element 200 including a dielectric ceramic 100 made of a dielectric composition will be described. Figure 1 is a perspective view of the dielectric element 200. As Figure 1As shown, the dielectric element 200 has a disc shape, and includes a disc-shaped dielectric ceramic (dielectric layer) 100 and electrodes 301 and 302 mounted on the upper and lower surfaces of the dielectric ceramic 100. The dielectric ceramic 100 is formed of the above dielectric composition. The electrodes 301 and 302 are made of Au, for example.

[0085] Here, an example of the manufacturing method of the dielectric element 200 will be described. First, as raw material powders, powders of strontium carbonate (an example of a compound that can become the Sr component), sodium carbonate (an example of a compound that can become the Na component), niobium oxide (an example of a compound that can become the Nb component), calcium carbonate (an example of a compound that can become the Ca component), yttrium oxide (an example of a compound that can become the Y component), and zirconium oxide (an example of a compound that can become the Zr component) are prepared, and these powders are weighed so as to achieve the target composition.

[0086] Ethanol is added to the weighed raw material powders, and then they are wet-mixed with a ball mill for 15 hours or more to obtain a slurry. The obtained slurry is appropriately dried to obtain a mixed powder. The obtained mixed powder is pre-fired at a temperature of 1100°C to 1300°C for 5 to 7 hours in an air atmosphere to obtain a pre-fired powder.

[0087] A dispersant, a binder, and ethanol are added to the obtained pre-fired powder, and then they are pulverized and mixed to obtain a slurry. The slurry is dried and granulated to obtain a granulated product, and the obtained granulated product is uniaxially pressed at a pressure of 20 MPa to obtain a disc-shaped preform. Then, the disc-shaped preform is subjected to CIP treatment (cold isostatic pressing treatment) at a pressure of 150 MPa to obtain a formed body.

[0088] The obtained formed body is held at 650°C for 4 hours to perform a debinding treatment. The formed body after the debinding treatment is subjected to air firing by being held at a temperature of 1300 to 1350°C for 4 hours in an air atmosphere to obtain a dielectric ceramic (dielectric layer) composed of the dielectric composition. Grinding treatment is performed on the two main surfaces (upper surface, lower surface) of the obtained dielectric ceramic, and then external electrodes made of Au are formed on the two main surfaces by sputtering to obtain the dielectric element 200.

[0089] Next, with reference to Figure 2 , the multilayer electronic component 1 including the dielectric layer 11 composed of the dielectric composition will be described. Figure 2 is a cross-sectional view of the multilayer electronic component 1. The multilayer electronic component 1 is a so-called multilayer ceramic capacitor, as Figure 2As shown, there is a laminate 10 having a plurality of dielectric layers 11 formed of a dielectric composition, a first internal electrode layer (an example of an internal electrode layer) 12 and a second internal electrode layer (an example of an internal electrode layer) 13 alternately laminated with the dielectric layer 11 therebetween, and a first external electrode 14 and a second external electrode 15 that are electrically connected to the first internal electrode layer 12 and the second internal electrode layer 13 and formed on the outer surface of the laminate 10. On one side of the multilayer electronic component 1, the first internal electrode layer 12 is connected to the first external electrode 14, and on the opposite side, the second internal electrode layer 13 is connected to the second external electrode 15.

[0090] As materials constituting the first internal electrode layer 12 and the second internal electrode layer 13, for example, Cu, Ag, Ni, etc. can be cited. As materials constituting the first external electrode 14 and the second external electrode 15, for example, Au, etc. can be cited.

[0091] Here, an example of the manufacturing method of the multilayer electronic component 1 will be described. First, as raw material powders, powders of strontium carbonate (an example of a compound that can become the Sr component), sodium carbonate (an example of a compound that can become the Na component), niobium oxide (an example of a compound that can become the Nb component), calcium carbonate (an example of a compound that can become the Ca component), yttrium oxide (an example of a compound that can become the Y component), and zirconium oxide (an example of a compound that can become the Zr component) are prepared, and these powders are weighed so as to achieve a target composition.

[0092] Ethanol is added to the weighed raw material powders, and then wet mixed with a ball mill for 15 hours or more to obtain a slurry. The obtained slurry is appropriately dried to obtain mixed powders. The obtained mixed powders are pre-fired in an air atmosphere at a temperature condition of 1100°C to 1300°C for 5 to 7 hours to obtain pre-fired powders.

[0093] A dispersant, a binder, and ethanol are added to the obtained pre-fired powders, and then pulverized and mixed to obtain a slurry. The slurry is processed into a sheet shape by a doctor blade method to produce a plurality of ceramic green sheets.

[0094] Next, using a conductive paste for an internal electrode, an electrode layer that becomes an internal electrode layer (first internal electrode layer, second internal electrode layer) is formed on one surface of the ceramic green sheet, for example, by screen printing. The electrode layer has gold (Au) as a main component. It should be noted that the electrode layer may also be an electrode layer having a base metal such as nickel (Ni) or platinum (Pt) as a main component other than Au, or an electrode layer composed of other components such as Ag-Pd.

[0095] Then, a plurality of green ceramic sheets formed with electrode layers are stacked in such a manner that the electrode layers are exposed alternately from both side surfaces, and green ceramic sheets not formed with electrode layers are further stacked on the front and back surfaces of the obtained stacked body respectively. By pressing the obtained stacked body, a stacked body in which the green ceramic sheets and the electrode layers are alternately stacked is obtained. The stacked body is cut into a desired shape, and then, for example, it is held at a temperature of 200 to 400 °C for 2 to 10 hours, thereby performing a debinding treatment.

[0096] The stacked body after the debinding treatment is held at a temperature of 1300 to 1350 °C for 4 hours in an air atmosphere or a reducing atmosphere, thereby performing firing in air. After firing, the green ceramic sheets become dielectric layers 11, and the electrode layers become internal electrode layers (first internal electrode layer, second internal electrode layer).

[0097] After appropriately grinding (such as barrel grinding, sandblasting, etc.) the side surfaces of the fired stacked body 10, a pair of external electrodes (first external electrode 14, second external electrode 15) made of Au are formed on the side surfaces of the stacked body 10 by, for example, sputtering method. Thus, the stacked electronic component 1 is obtained.

[0098] The dielectric constant reduction amplitude of the dielectric composition disclosed in this specification before and after applying a DC high voltage is small, and the relative dielectric constant under a high electric field is high. In addition, the above dielectric composition has high withstand voltage.

[0099] A dielectric element having a dielectric layer formed of the above dielectric composition, a stacked electronic component, for example, is used in a power transmission system of an electric vehicle for applying a high voltage (such as 400V to 800V). As the above stacked electronic component, for example, a dielectric capacitor, a multilayer ceramic capacitor, etc. can be cited. In addition, the above dielectric composition can be used in various electronic devices such as home appliances and automotive control devices.

[0100] Examples

[0101] Hereinafter, the present invention will be described in more detail based on examples. It should be noted that the present invention is not limited by any of these examples.

[0102] [Examples 1 to 5, Comparative Examples 1 to 4]

[0103] As raw material powders, powders of strontium carbonate, calcium carbonate, sodium carbonate, potassium carbonate, niobium oxide, yttrium oxide, and zirconium oxide are prepared, the required powders are selected from them, and they are weighed in such a manner as to become the respective compositions shown in Table 1. Ethanol is added to the weighed raw material powders, and then they are wet-mixed with a ball mill for 15 hours or more, thereby obtaining a slurry. The obtained slurry is appropriately dried, thereby obtaining a mixed powder. The obtained mixed powder is pre-fired at a temperature of 1200 °C for 6 hours in an air atmosphere, thereby obtaining a pre-fired powder.

[0104] A dispersant, a binder, and ethanol are added to the obtained pre-fired powder, followed by pulverization and mixing to obtain a slurry. The slurry is dried and granulated, and the obtained granulated product is uniaxially pressed at a pressure of 20 MPa to obtain a disc-shaped preform. Then, the disc-shaped preform is subjected to CIP treatment (cold isostatic pressing) at a pressure of 150 MPa to obtain a formed body.

[0105] The obtained formed body is held at 650 °C for 4 hours to perform a debinding treatment. The formed body after the debinding treatment is subjected to atmospheric firing by holding it at a temperature of 1300 - 1350 °C in an atmospheric atmosphere for 4 hours to obtain a dielectric ceramic composed of a dielectric composition. Grinding treatment is performed on two main surfaces (upper surface, lower surface) of the obtained dielectric ceramic to obtain a measurement sample including two mirror-like main surfaces.

[0106] Then, in order to evaluate the electrical properties, external electrodes made of Au are formed on two main surfaces of the dielectric ceramic by sputtering to obtain a dielectric element (measurement sample for electrical property evaluation).

[0107] [Evaluation]

[0108] For each of the samples of Examples 1 - 5 and Comparative Examples 1 - 4, the following tests are conducted.

[0109] (Composition analysis)

[0110] Composition analysis of each sample is performed by X-ray fluorescence analysis (XRF). The measurement surface of each sample is the mirror-like main surface, and the measurement diameter is 1 mm. The results are shown in Table 1. It should be noted that each composition is expressed as a molar ratio (%) in terms of oxide conversion.

[0111] The molar ratio (%) in terms of oxide conversion here refers to the value expressed as a molar ratio (%) of the amount of each component oxide contained in the sample (dielectric composition) when the total amount of the oxide is assumed to be 100 mol% in the case where the sample (dielectric composition) is completely decomposed and changed into oxides.

[0112] (Relative dielectric constant)

[0113] The relative dielectric constants (0 kV / mm, 8 kV / mm) of the measurement samples for electrical property evaluation are calculated from the values of the electrostatic capacitance at 1 kHz measured using an impedance analyzer in a state where no DC voltage is applied at room temperature (i.e., 0 kV / mm), and the values of the electrostatic capacitance at 1 kHz measured using an impedance analyzer in a state where a DC voltage of 8 kV / mm is applied at room temperature. The results are shown in Table 1.

[0114] (Rate of decrease in relative permittivity)

[0115] The rate of decrease (rate of change) [%] of the relative permittivity from the relative permittivity at an applied voltage of 0 kV / mm to the relative permittivity at an applied voltage of 8 kV / mm is obtained by [(relative permittivity at 8 kV / mm) - (relative permittivity at 0 kV / mm)] / (relative permittivity at 0 kV / mm) × 100. The results are shown in Table 1.

[0116] [Table 1]

[0117]

[0118] For the dielectric compositions of Examples 1 to 4 and 8, as shown in Table 1, the relative permittivity at a high electric field (8 kV / mm) is 900 or more, and the rate of decrease (rate of change) in the relative permittivity before and after the application of a DC high voltage is greater than -41%, and the reduction in the relative permittivity is suppressed to be small. In particular, for the dielectric compositions of Examples 3, 4, and 8, the following results are obtained: the relative permittivity at 8 kV / mm is 1000 or more, and the rate of decrease (rate of change) in the relative permittivity is greater than -41%.

[0119] The results of the dielectric compositions of Examples 1 to 9 are as follows: the relative permittivity at 8 kV / mm is 600 or more, and the rate of decrease (rate of change) in the relative permittivity is greater than -41%. The results of the dielectric compositions of Examples 1 to 5, 8, and 9 are as follows: the relative permittivity at 8 kV / mm is 700 or more, and the rate of decrease (rate of change) in the relative permittivity is greater than -41%. The results of the dielectric composition of Example 9 are as follows: the relative permittivity at 8 kV / mm is 600 or more, and the rate of decrease (rate of change) in the relative permittivity is -5.9% or more.

[0120] The dielectric composition of Comparative Example 1 has a small relative permittivity at a high electric field (8 kV / mm). In addition, for the dielectric composition of Comparative Example 1, the reduction in the relative permittivity is larger than that of Examples 1 to 9.

[0121] In addition, for the dielectric compositions of Comparative Examples 2 to 4, the relative permittivity at a high electric field (8 kV / mm) is large, but the reduction in the relative permittivity is larger than that of Examples 1 to 9.

[0122] In addition, for the dielectric compositions of Examples 3 and 4, the relative permittivity at a high electric field (8 kV / mm) is 1000 or more, and the rate of decrease (rate of change) in the relative permittivity before and after the application of a DC high voltage is -35% or more, and the reduction in the relative permittivity is suppressed to be even smaller.

[0123] Symbol Explanation

[0124] 100…Dielectric ceramic (dielectric layer), 200…Dielectric element, 301, 302…Electrodes, 1…Multilayer electronic component, 10…Stacked body, 11…Dielectric layer, 12…First internal electrode layer (internal electrode layer), 13…Second internal electrode layer (internal electrode layer), 14…First external electrode, 15…Second external electrode.

Claims

1. A dielectric composition, which is a dielectric composition containing a strontium component, a sodium component, a niobium component, a calcium component, a yttrium component, and a zirconium component, wherein, The molar ratio (%) of each component in the dielectric composition in terms of oxide conversion is as follows: 14.7 ≤ strontium component ≤ 20.7, 13.5 ≤ sodium component ≤ 23.5, 60.1 ≤ niobium component ≤ 63.2, 0.66 ≤ calcium component ≤ 2.93, 0.53 ≤ yttrium component ≤ 2.23, 0.48 ≤ zirconium component ≤ 2.

27.

2. The dielectric composition according to claim 1, wherein The molar ratio (%) of each component in terms of oxide conversion is as follows: 14.7 ≤ strontium component ≤ 20.7, 14.2 ≤ sodium component ≤ 23.5, 60.1 ≤ niobium component ≤ 63.2, 0.66 ≤ calcium component ≤ 1.56, 0.53 ≤ yttrium component ≤ 1.25, 0.48 ≤ zirconium component ≤ 1.

24.

3. The dielectric composition according to claim 1, wherein, The molar ratio (%) of each component in terms of oxide conversion is as follows: 16.8 ≤ strontium component ≤ 20.4, 13.5 ≤ sodium component ≤ 14.3, 61.7 ≤ niobium component ≤ 63.1, 1.21 ≤ calcium component ≤ 2.93, 1.09 ≤ yttrium component ≤ 2.23, 1.00 ≤ zirconium component ≤ 2.

27.

4. The dielectric composition according to claim 1, wherein The molar ratio (%) of each component in terms of oxide conversion is as follows: 14.7 ≤ strontium component ≤ 20.7, 14.3 ≤ sodium component ≤ 23.5, 60.1 ≤ niobium component ≤ 63.2, 0.66 ≤ calcium component ≤ 0.76, 0.53 ≤ yttrium component ≤ 0.59, 0.48 ≤ zirconium component ≤ 0.

59.

5. The dielectric composition according to claim 1, wherein The molar ratio (%) of each component in terms of oxide conversion is as follows: 18.2 ≤ strontium component ≤ 20.7, 14.3 ≤ sodium component ≤ 17.3, 62.6 ≤ niobium component ≤ 63.2, 0.67 ≤ calcium component ≤ 0.76, 0.53 ≤ yttrium component ≤ 0.55, 0.49 ≤ zirconium component ≤ 0.

59.

6. A dielectric element, comprising a dielectric ceramic formed from the dielectric composition according to any one of claims 1 to 5 and an electrode mounted on the dielectric ceramic.

7. A multilayer electronic component, comprising a laminate in which dielectric layers and internal electrode layers formed from the dielectric composition according to any one of claims 1 to 5 are alternately laminated.

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