Dielectric composition, dielectric element, and laminated electronic component

Abstract

The dielectric composition of the present invention contains a strontium component, a sodium component, a niobium component, a calcium component, an yttrium component, and a zirconium component. The molar ratios (%) of the respective components in the dielectric composition in terms of oxide satisfy: 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

Dielectric composition, dielectric element, and laminated electronic component

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

[0002] Dielectric capacitors (e.g., multilayer ceramic capacitors) are capacitors having a dielectric layer formed from a dielectric composition, and are used as key components in various electronic devices such as home appliances and automobile control devices. Among these dielectric capacitors, for example, those used in the powertrains of electric vehicles are subjected to high voltages (e.g., 400 V to 800 V) as batteries become higher voltages. Therefore, they are required to have a high withstand voltage (not break down under the applied high voltage) as well as a high relative dielectric constant under a high electric field. Furthermore, in addition to the high withstand voltage and high relative dielectric constant under a high electric field, these types of dielectric capacitors are also required to have a large capacitance (i.e., a large capacitance).

[0003] As shown in Patent Document 1, in order to obtain a large capacitance in an environment where a high voltage is applied, it is required that the change (decreasing amount) in the relative dielectric constant when a DC voltage is applied is small.

[0004] Conventionally, high dielectric constant BaTiO ３ Dielectric compositions containing BaTiO ３ Dielectric compositions containing tungsten bronze have a significantly reduced dielectric constant under high electric fields. For this reason, it has been proposed to use a dielectric composition having a tungsten bronze structure in a dielectric capacitor, as shown in Patent Document 1, for example.

[0005] International Publication No. 2017 / 163845

[0006] In conventional dielectric compositions having a tungsten bronze structure, although the change (reduction) in the dielectric constant is small, the dielectric constant under a high electric field is not sufficiently high, which has been a problem.

[0007] An object of the present invention is to provide a dielectric composition or the like which shows a small decrease in relative dielectric constant before and after application of a high DC voltage and which has a high relative dielectric constant under a high electric field.

[0008] The means for solving the above problems are as follows: <1> 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 ratios (%) of the components in the dielectric composition, calculated as oxides, are 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. This achieves the effects of a relative dielectric constant of 600 or more at 8 kV / mm and a rate of change in relative dielectric constant from 0 kV / mm to 8 kV / mm of greater than −41%.

[0009] <2> A dielectric composition according to <1>, containing a strontium component, a sodium component, a niobium component, a calcium component, a yttrium component, and a zirconium component, wherein the molar ratios (%) of the components in the dielectric composition, calculated as oxides, are 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, and 0.48≦zirconium component≦1.24. This achieves the effects of a relative dielectric constant of 700 or more at 8 kV / mm and a rate of change in relative dielectric constant of greater than −41% when the voltage is changed from 0 kV / mm to 8 kV / mm.

[0010] <3> A dielectric composition according to <1>, containing a strontium component, a sodium component, a niobium component, a calcium component, a yttrium component, and a zirconium component, wherein the molar ratios (%) of the components in the dielectric composition, calculated as oxides, are 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, and 1.00≦zirconium component≦2.27. This provides the effects of a relative dielectric constant of 600 or more at 8 kV / mm and a rate of change in relative dielectric constant of −5.9% or more when the voltage is changed from 0 kV / mm to 8 kV / mm.

[0011] <4> The dielectric composition according to <1>, wherein the molar ratios (%) of the components calculated as oxides are 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.

[0012] <5> The dielectric composition according to <1>, wherein the molar ratios (%) of the components calculated as oxides are 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.

[0013] <6> A dielectric element comprising a dielectric ceramic formed from the dielectric composition according to any one of <1> to <5>, and an electrode attached to the dielectric ceramic.

[0014] <7> A laminated electronic component comprising a laminate formed by alternately laminating dielectric layers made of the dielectric composition according to any one of <1> to <5> and internal electrode layers.

[0015] According to the present invention, it is possible to provide a dielectric composition or the like which shows a small decrease in relative dielectric constant before and after application of a high DC voltage and has a high relative dielectric constant under a high electric field.

[0016] Perspective view of a dielectric element Cross-sectional view of a laminated electronic component

[0017] The dielectric composition, the dielectric element, and the laminated electronic component according to the embodiment will be described below.

[0018] The dielectric composition is a sintered ceramic body containing a strontium component, a sodium component, a niobium component, a calcium component, a yttrium component, and a zirconium component.

[0019] The molar ratios (%) of the respective components in the dielectric composition calculated as oxides are as follows: 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.

[0020] The molar ratio (%) in terms of oxides is the amount of oxide of each component contained in the dielectric composition expressed as a molar ratio (%) when the total amount of oxides is 100 mol % assuming that the dielectric composition is completely decomposed and converted into oxides.

[0021] The strontium component (hereinafter sometimes referred to as "Sr component") is present in the dielectric composition as an oxide, ions, or the like.

[0022] In the dielectric composition, the molar ratio (%) of the Sr component calculated as an oxide (calculated as SrO) is 14.7 or more and 20.7 or less.

[0023] The raw material of the Sr component includes a compound that can be converted to the Sr component by firing. Examples of the compound that can be converted to the Sr component include various inorganic powders such as Sr oxide, Sr composite oxide, Sr hydroxide, Sr carbonate, Sr chloride, Sr sulfate, Sr nitrate, and Sr phosphate. A specific example is strontium carbonate powder. The amount of the compound that can be converted to the Sr component is determined as a molar ratio (%) in terms of oxide (SrO equivalent).

[0024] The sodium component (hereinafter sometimes referred to as "Na component") is present in the dielectric composition as an oxide, ions, or the like.

[0025] In the dielectric composition, the oxide equivalent of the Na component (NaO ０．５ The molar ratio (%) in terms of the total amount of the hydroxyl group (as converted) is 14.3 or more and 23.5 or less.

[0026] The raw material of the Na component includes a compound that can be converted to a Na component by firing. Examples of the compound that can be converted to the Na component include various inorganic powders such as oxide of Na, composite oxide of Na, hydroxide of Na, carbonate of Na, chloride of Na, sulfate of Na, nitrate of Na, and phosphate of Na. A specific example is sodium carbonate powder. The amount of the compound that can be converted to the Na component used is calculated as an oxide (NaO ０．５ This is determined by the molar ratio (%) of the converted amount.

[0027] The niobium component (hereinafter sometimes referred to as "Nb component") is present in the dielectric composition as an oxide, ions, or the like.

[0028] In the dielectric composition, the oxide equivalent of the Nb component (NbO ２．５ The molar ratio (%) in terms of the total amount of the hydroxyl group (as converted) is 60.1 or more and 63.2 or less.

[0029] The raw material of the Nb component includes a compound that can be converted to the Nb component by firing. Examples of the compound that can be converted to the Nb component include various inorganic powders such as Nb oxide, Nb composite oxide, Nb hydroxide, Nb carbonate, Nb chloride, Nb sulfate, Nb nitrate, and Nb phosphate. Specifically, niobium oxide powder can be used. The amount of the compound that can be converted to the Nb component is calculated as an oxide (NbO ２．５ This is determined by the molar ratio (%) of the converted amount.

[0030] The calcium component (hereinafter sometimes referred to as "Ca component") is present in the dielectric composition as an oxide, ions, or the like.

[0031] In the dielectric composition, the molar ratio (%) of the Ca component calculated as an oxide (calculated as CaO) is 0.656 or more and 0.763 or less.

[0032] The raw material of the Ca component includes a compound that can be converted to the Ca component by firing. Examples of the compound that can be converted to the Ca component include various inorganic powders such as Ca oxide, Ca composite oxide, Ca hydroxide, Ca carbonate, Ca chloride, Ca sulfate, Ca nitrate, and Ca phosphate. A specific example is calcium carbonate powder. The amount of the compound that can be converted to the Ca component is determined as a molar ratio (%) in terms of oxide (CaO).

[0033] The yttrium component (hereinafter sometimes referred to as "Y component") is present in the dielectric composition as an oxide, ions, or the like.

[0034] In the dielectric composition, the amount of the Y component in terms of oxide (YO １．５ The molar ratio (%) in terms of the total amount of hydroxyl groups (as converted) is 0.531 or more and 0.586 or less.

[0035] The raw material of the Y component includes a compound that can be converted to the Y component by firing. Examples of the compound that can be converted to the Y component include various inorganic powders such as oxide of Y, composite oxide of Y, hydroxide of Y, carbonate of Y, chloride of Y, sulfate of Y, nitrate of Y, and phosphate of Y. Specifically, yttrium oxide powder can be used. The amount of the compound that can be converted to the Y component is calculated as an oxide (YO １．５ This is determined by the molar ratio (%) of the converted amount.

[0036] The zirconium component (hereinafter sometimes referred to as "Zr component") is present in the dielectric composition as an oxide, ions, or the like.

[0037] In the dielectric composition, the amount of the Zr component converted into oxide (ZrO ２ The molar ratio (%) in terms of the total amount of hydroxyl groups (as converted) is 0.483 or more and 0.589 or less.

[0038] The raw material of the Zr component includes a compound that can be converted to a Zr component by firing. Examples of the compound that can be converted to a Zr component include various inorganic powders such as Zr oxide, Zr composite oxide, Zr hydroxide, Zr carbonate, Zr chloride, Zr sulfate, Zr nitrate, and Zr phosphate. A specific example is zirconium oxide powder. The amount of the compound that can be converted to a Zr component used is calculated as an oxide (ZrO ２ This is determined by the molar ratio (%) of the converted amount.

[0039] The dielectric composition may contain elements other than the strontium component, sodium component, niobium component, calcium component, yttrium component and zirconium component as unavoidable impurities in a proportion of 1000 ppm or less, as long as the object of the present invention is not impaired.

[0040] The method for producing the dielectric composition will be explained appropriately in the explanation of the methods for producing the dielectric element and laminated electronic component described later.

[0041] In the dielectric composition, when the molar ratios (%) of the strontium component, sodium component, niobium component, calcium component, yttrium component, and zirconium component, calculated as oxides, are within the above-mentioned ranges, the dielectric constant under a high electric field (8 kV / mm) becomes 900 or more, and the rate of decrease in the dielectric constant before and after application of a high DC voltage becomes larger than −41%, so that the decrease in the dielectric constant is kept small.

[0042] In the 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 it does not impair the object of the present invention, but is preferably 1400 or more, more preferably 1500 or more.

[0043] In particular, in the dielectric composition, the molar ratios (%) of the respective components, calculated as oxides, are preferably as follows: 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, and 0.489≦zirconium component≦0.548. When the molar ratios (%) of the respective components are within these ranges, the relative dielectric constant under a high electric field (8 kV / mm) is 1000 or more, and the rate of decrease in the relative dielectric constant before and after application of a high DC voltage is −35% or more, further minimizing the decrease in the relative dielectric constant.

[0044] Next, a dielectric element 200 including a dielectric porcelain 100 made of a dielectric composition will be described with reference to Fig. 1. Fig. 1 is a perspective view of the dielectric element 200. As shown in Fig. 1, the dielectric element 200 has a disk-shaped appearance and comprises a disk-shaped dielectric porcelain (dielectric layer) 100 and electrodes 301 and 302 attached to the upper and lower surfaces of the dielectric porcelain 100. The dielectric porcelain 100 is formed from the above-mentioned dielectric composition. The electrodes 301 and 302 are made of, for example, Au.

[0045] Here, an example of a method for manufacturing the dielectric element 200 will be described. First, as raw material powders, powders of strontium carbonate (an example of a compound that can become an Sr component), sodium carbonate (an example of a compound that can become an Na component), niobium oxide (an example of a compound that can become an Nb component), calcium carbonate (an example of a compound that can become a Ca component), yttrium oxide (an example of a compound that can become a Y component), and zirconium oxide (an example of a compound that can become a Zr component) are prepared, and these powders are weighed out so as to obtain the desired composition.

[0046] Ethanol is added to the weighed raw material powders and the mixture is wet-mixed in a ball mill for 15 hours or more to obtain a slurry. The resulting slurry is dried appropriately to obtain a mixed powder. The resulting mixed powder is calcined in an air atmosphere at a temperature of 1100°C to 1300°C for 5 to 7 hours to obtain a calcined powder.

[0047] The calcined powder was mixed with a dispersant, a binder, and ethanol to obtain a slurry, which was then dried and granulated. The granulated material was then uniaxially pressed at a pressure of 20 MPa to obtain a disk-shaped pre-formed body. The disk-shaped pre-formed body was then subjected to cold isostatic pressing (CIP) at a pressure of 150 MPa to obtain a compact.

[0048] The obtained compact is subjected to a binder removal treatment by holding it at 650°C for 4 hours. The compact after the binder removal treatment is subjected to air firing by holding it in an air atmosphere at a temperature condition of 1300 to 1350°C for 4 hours, thereby obtaining a dielectric ceramic (dielectric layer) made of the dielectric composition. Both main surfaces (upper and lower surfaces) of the obtained dielectric ceramic are subjected to a polishing treatment, and then external electrodes made of Au are formed on both main surfaces by a sputtering method, thereby obtaining the dielectric element 200.

[0049] Next, a laminated electronic component 1 including a dielectric layer 11 made of a dielectric composition will be described with reference to Fig. 2 . Fig. 2 is a cross-sectional view of the laminated electronic component 1. The laminated electronic component 1 is a so-called multilayer ceramic capacitor, and as shown in Fig. 2 , includes a laminate 10 having a plurality of dielectric layers 11 made of a dielectric composition, first internal electrode layers (an example of internal electrode layers) 12 and second internal electrode layers (an example of internal electrode layers) 13 alternately stacked with the dielectric layers 11 interposed therebetween, and first external electrodes 14 and second external electrodes 15 electrically connected to the first internal electrode layers 12 and second internal electrode layers 13 and formed on the outer surface of the laminate 10. The first internal electrode layers 12 and the first external electrode 14 are connected on one side of the laminated electronic component 1, and the second internal electrode layers 13 and the second external electrode 15 are connected on the other opposing side.

[0050] Examples of materials that form the first internal electrode layers 12 and the second internal electrode layers 13 include Cu, Ag, Ni, etc. Examples of materials that form the first external electrode 14 and the second external electrode 15 include Au, etc.

[0051] Here, we will explain one example of a method for manufacturing the laminate electronic component 1. First, as raw material powders, powders of strontium carbonate (an example of a compound that can become an Sr component), sodium carbonate (an example of a compound that can become an Na component), niobium oxide (an example of a compound that can become an Nb component), calcium carbonate (an example of a compound that can become a Ca component), yttrium oxide (an example of a compound that can become a Y component), and zirconium oxide (an example of a compound that can become a Zr component) are prepared, and these powders are weighed out to obtain the desired composition.

[0052] Ethanol is added to the weighed raw material powders and the mixture is wet-mixed in a ball mill for 15 hours or more to obtain a slurry. The resulting slurry is dried appropriately to obtain a mixed powder. The resulting mixed powder is calcined in an air atmosphere at a temperature of 1100°C to 1300°C for 5 to 7 hours to obtain a calcined powder.

[0053] A dispersant, a binder, and ethanol are added to the calcined powder, and the mixture is pulverized and mixed to obtain a slurry, which is then processed into a sheet shape by a doctor blade method to produce a plurality of ceramic green sheets.

[0054] Next, an electrode layer that will become the internal electrode layer (first internal electrode layer, second internal electrode layer) is formed on one side of the ceramic green sheet using a conductive paste for the internal electrodes, for example by screen printing. The electrode layer is mainly composed of gold (Au). Note that the electrode layer may be composed of a base metal such as nickel (Ni) or platinum (Pt) as the main component, or may be composed of other components such as Ag-Pd, in addition to Au.

[0055] Next, multiple ceramic green sheets with electrode layers formed thereon are stacked so that the electrode layers are exposed alternately from both sides, and ceramic green sheets without electrode layers are stacked on both the front and back sides of the resulting laminate. The resulting laminate is then pressed together to obtain a laminate in which ceramic green sheets and electrode layers are alternately stacked. This laminate is then cut into a desired shape and then subjected to a binder removal treatment, for example, by holding it at a temperature of 200 to 400°C for 2 to 10 hours.

[0056] The laminate after the binder removal treatment is subjected to air firing by being held for 4 hours in an air atmosphere or a reducing atmosphere at a temperature of 1300 to 1350°C. After firing, the ceramic green sheets become the dielectric layers 11, and the electrode layers become the internal electrode layers (first internal electrode layers, second internal electrode layers).

[0057] After the firing, the side surfaces of the laminate 10 are polished appropriately (by barrel polishing, sandblasting, or the like), and then a pair of external electrodes (first external electrode 14, second external electrode 15) made of Au are formed, for example, by sputtering, on the side surfaces of the laminate 10. In this manner, the laminate electronic component 1 is obtained.

[0058] The dielectric composition disclosed herein exhibits a small decrease in relative permittivity before and after application of a high DC voltage, a high relative permittivity under a high electric field, and a high withstand voltage.

[0059] Dielectric elements and laminated electronic components having a dielectric layer formed from the dielectric composition are used, for example, in the powertrain of an electric vehicle to which a high voltage (e.g., 400 V to 800 V) is applied. Examples of the laminated electronic components include dielectric capacitors and laminated ceramic capacitors. The dielectric composition may also be used in various electronic devices such as home appliances and automobile control devices.

[0060] The present invention will be described in more detail below with reference to examples, although the present invention is not limited to these examples in any way.

[0061] Examples 1 to 5, Comparative Examples 1 to 4 Powders of strontium carbonate, calcium carbonate, sodium carbonate, potassium carbonate, niobium oxide, yttrium oxide, and zirconium oxide were prepared as raw material powders, and necessary powders were selected from these and weighed to obtain the compositions shown in Table 1. Ethanol was added to the weighed raw material powders, and the mixture was wet-mixed in a ball mill for 15 hours or more to obtain a slurry. The obtained slurry was appropriately dried to obtain a mixed powder. The obtained mixed powder was calcined in an air atmosphere at a temperature of 1200°C for 6 hours to obtain a calcined powder.

[0062] The calcined powder was mixed with a dispersant, a binder, and ethanol to obtain a slurry. The slurry was dried and granulated, and the granulated material was uniaxially pressed at a pressure of 20 MPa to obtain a disk-shaped pre-formed body. The disk-shaped pre-formed body was then subjected to cold isostatic pressing (CIP) at a pressure of 150 MPa to obtain a compact.

[0063] The obtained compact was subjected to a binder removal treatment by holding it at 650°C for 4 hours. The compact after the binder removal treatment was subjected to air firing by holding it in an air atmosphere at a temperature condition of 1300 to 1350°C for 4 hours, thereby obtaining a dielectric porcelain made of the dielectric composition. Both main surfaces (upper and lower surfaces) of the obtained dielectric porcelain were subjected to a polishing treatment to obtain a measurement sample including both mirror-like main surfaces.

[0064] Thereafter, in order to evaluate the electrical properties, external electrodes made of Au were formed on both main surfaces of the dielectric ceramic by sputtering, thereby obtaining a dielectric element (a measurement sample for evaluating the electrical properties).

[0065] [Evaluation] The samples of Examples 1 to 5 and Comparative Examples 1 to 4 were subjected to the following tests.

[0066] (Composition Analysis) The composition of each sample was analyzed by X-ray fluorescence analysis (XRF). The measurement surface of each sample was the mirror-like main surface, and the measurement diameter was 1 mm in diameter. The results are shown in Table 1. Each composition is expressed as a molar ratio (%) in terms of oxide.

[0067] The molar ratio (%) in terms of oxides herein refers to the amount of oxide of each component contained in the sample (dielectric composition) expressed as a molar ratio (%) when the total amount of oxides is taken as 100 mol % assuming that the sample (dielectric composition) is entirely decomposed and converted into oxides.

[0068] (Dielectric Constant) The dielectric constants (0 kV / mm, 8 kV / mm) of the measurement samples for evaluating electrical properties were calculated from the capacitance value at 1 kHz measured using an impedance analyzer at room temperature without applying a DC voltage (i.e., 0 kV / mm) and the capacitance value at 1 kHz measured using an impedance analyzer at room temperature with applying a DC voltage of 8 kV / mm. The results are shown in Table 1.

[0069] (Reduction Rate of Dielectric Constant) The reduction rate (change rate) [%] of the dielectric constant at an applied voltage of 0 kV / mm to the dielectric constant at an applied voltage of 8 kV / mm was calculated by [(Dielectric constant at 8 kV / mm) - (Dielectric constant at 0 kV / mm)] / (Dielectric constant at 0 kV / mm) x 100. The results are shown in Table 1.

[0070]

[0071] In the dielectric compositions of Examples 1 to 4 and 8, the dielectric constant under a high electric field (8 kV / mm) was 900 or more, and the rate of decrease (rate of change) in the dielectric constant before and after application of a high DC voltage was greater than -41%, so the decrease in the dielectric constant was kept small, as shown in Table 1. In particular, in the dielectric compositions of Examples 3, 4 and 8, the dielectric constant at 8 kV / mm was 1000 or more, and the rate of decrease (rate of change) in the dielectric constant was greater than -41%.

[0072] The dielectric compositions of Examples 1 to 9 had a dielectric constant of 600 or more at 8 kV / mm, and the rate of decrease (rate of change) of the dielectric constant was greater than -41%. The dielectric compositions of Examples 1 to 5, 8, and 9 had a dielectric constant of 700 or more at 8 kV / mm, and the rate of decrease (rate of change) of the dielectric constant was greater than -41%. The dielectric composition of Example 9 had a dielectric constant of 600 or more at 8 kV / mm, and the rate of decrease (rate of change) of the dielectric constant was greater than -5.9%.

[0073] The dielectric constant of the dielectric composition of Comparative Example 1 was low under a high electric field (8 kV / mm). Furthermore, the dielectric constant of the dielectric composition of Comparative Example 1 decreased by a larger amount than that of Examples 1 to 9.

[0074] Furthermore, in the dielectric compositions of Comparative Examples 2 to 4, although the relative dielectric constant under a high electric field (8 kV / mm) was large, the extent of decrease in the relative dielectric constant was larger than in Examples 1 to 9.

[0075] In the dielectric compositions of Examples 3 and 4, the dielectric constant under a high electric field (8 kV / mm) was 1000 or more, and the rate of decrease (rate of change) in the dielectric constant before and after application of a high DC voltage was −35% or more, so the decrease in the dielectric constant was further reduced.

[0076] 100...Dielectric ceramic (dielectric layer), 200...Dielectric element, 301, 302...Electrodes, 1...Laminated electronic component, 10...Laminate, 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 containing a strontium component, a sodium component, a niobium component, a calcium component, a yttrium component and a zirconium component, wherein the molar ratios (%) of each component in the dielectric composition calculated as an oxide are 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 ratios (%) of the components calculated as oxides are 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, and 0.48≦zirconium component≦1.

24.

3. The dielectric composition according to claim 1, wherein the molar ratios (%) of the respective components calculated as oxides are 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, and 1.00≦zirconium component≦2.

27.

4. The dielectric composition according to claim 1, wherein the molar ratios (%) of the components calculated as oxides are 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, and 0.48≦zirconium component≦0.

59.

5. The dielectric composition according to claim 1, wherein the molar ratios (%) of the respective components calculated as oxides are 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, and 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 attached to the dielectric ceramic.

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

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