CN108794004B - Lanthanum-neodymium doped nickelate ceramic and preparation method and application thereof - Google Patents
Lanthanum-neodymium doped nickelate ceramic and preparation method and application thereof Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 77
- JKAYFQPEIRPZPA-UHFFFAOYSA-N lanthanum neodymium Chemical compound [La][Nd] JKAYFQPEIRPZPA-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 34
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005245 sintering Methods 0.000 claims abstract description 17
- 239000003292 glue Substances 0.000 claims abstract description 16
- 238000007873 sieving Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000000498 ball milling Methods 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims abstract description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 9
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 8
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 8
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims abstract description 8
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000007864 aqueous solution Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 claims description 6
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 4
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims 2
- 239000002002 slurry Substances 0.000 claims 1
- 238000004146 energy storage Methods 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 2
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 description 7
- 238000012360 testing method Methods 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
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- 238000005303 weighing Methods 0.000 description 2
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- 229910052797 bismuth Inorganic materials 0.000 description 1
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- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
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- 229910052745 lead Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
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- 229910052716 thallium Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
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Abstract
The invention discloses a lanthanum-neodymium doped nickelateThe lanthanum-neodymium doped nickelate ceramic has a chemical formula of L a2‑xNdxNiO4Wherein x is more than or equal to 0.1 and less than or equal to 0.6; the preparation method of the lanthanum-neodymium doped nickelate ceramic comprises the following steps: (1) mixing lanthanum source, neodymium source and nickel source raw materials with alumina balls and absolute ethyl alcohol, and carrying out ball milling to obtain powder; (2) sieving the powder obtained in the step (1) and roasting; (3) adding a polyvinyl alcohol (PVA) aqueous solution into the powder obtained after roasting in the step (2), grinding, granulating, sieving, pressing into a ceramic blank, and removing the glue to obtain a ceramic blank after removing the glue; (4) and (4) sintering the ceramic blank after the glue is removed, which is obtained in the step (3), so as to obtain the lanthanum-neodymium doped nickelate ceramic. The operation is convenient, the synthesis process is simple, and the preparation cost is low; the lanthanum neodymium doped nickelate ceramics can be used as dielectric ceramics, for example, as capacitor (e.g., energy storage capacitor) materials.
Description
Technical Field
The invention relates to the technical field of dielectric ceramic materials, in particular to lanthanum-neodymium doped nickelate ceramic and a preparation method and application thereof.
Background
Is generally considered to have A2BO4(e.g. K)2NiF4) The perovskite-like composite oxide has a structure formed by a perovskite layer (ABO)3) And a saltbed (AO) layer in which the smaller B-site ions have a hexa-coordinate [ BO ] by alternating superposition in a molar ratio of 1:16]The structure, generally occupied by transition metal ions, is the framework of a perovskite; the larger A-site ion having nine coordinates [ AO9]Structure, normally occupied by alkaline earth, rare earth (L n) ions due to intercalation of the salt formation (AO), such that A is present2BO4The perovskite-like composite oxide of the structure has wider variation space. While also permitting the formation of the original perovskite layer (ABO)3) Middle six coordination [ BO6]The octahedral structure undergoes lattice distortion, pair A2BO4The structure can play a stabilizing role. However, A, B ions capable of forming a perovskite-like composite oxide having a stable structure are few as known in the prior art, and generally only alkaline earth, rare earth, and Tl, Bi, Pb, and the like are suitable as a-site ions; transition metal ions are suitable as B site ions and more commonly include Ni, Cu and Co ions, among others.
With the rapid development of electronic information technology, the miniaturization, miniaturization and high stability of electronic components have become important research subjects in the modern information field. Dielectric materials are key materials for energy storage capacitors, wherein ceramic dielectrics are receiving increasing attention due to high dielectric constant, slow aging speed, high mechanical strength, wide application range and capability of being used in complex environments, and are typically represented by nickelate ceramics.
The miniaturization and weight reduction of energy storage elements place increasing demands on the energy storage density of dielectric ceramics. Therefore, how to increase the dielectric breakdown strength of the dielectric ceramic to increase the energy storage density of the dielectric ceramic is a key to the preparation of high energy storage capacitors.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a lanthanum-neodymium doped nickelate ceramic having a chemical formula of L a2-xNdxNiO4Wherein x is more than or equal to 0.1 and less than or equal to 0.6.
Examples of x for the ceramic according to the invention may be 0.1, 0.2, 0.3, 0.4, 0.5 or 0.6, for example.
The ceramic has a particle size of 3-15 μm, preferably 3-8 μm, such as 5 μm.
The invention also provides a preparation method of the lanthanum-neodymium doped nickelate ceramic, which comprises the following steps:
(1) mixing lanthanum source, neodymium source and nickel source raw materials with alumina balls and absolute ethyl alcohol, and carrying out ball milling to obtain powder;
(2) sieving the powder obtained in the step (1) and roasting;
(3) adding a polyvinyl alcohol (PVA) aqueous solution into the powder obtained after roasting in the step (2), grinding, granulating, sieving, pressing into a ceramic blank, and removing the glue to obtain a ceramic blank after removing the glue;
(4) and (4) sintering the ceramic blank after the glue is removed, which is obtained in the step (3), so as to obtain the lanthanum-neodymium doped nickelate ceramic.
According to an embodiment of the present invention, in the step (1), the lanthanum source raw material is selected from lanthanum oxide (L a)2O3) (ii) a The neodymium source material is selected from neodymium oxide (Nd)2O3) (ii) a The nickel source material is selected from nickel oxide (NiO).
According to an embodiment of the invention, in step (1), the amounts of the raw materials of the lanthanum source, the neodymium source and the nickel source are selected so that the lanthanum-neodymium doped nickelate ceramic prepared by the method meets the chemical formula L a2-xNdxNiO4The range defined.
According to an embodiment of the present invention, the step (1) may include the steps of:
(1a) adding lanthanum source, neodymium source and nickel source raw materials into a ball milling tank, adding alumina balls and absolute ethyl alcohol, and carrying out ball milling for 1-48 h (such as 12-24 h) to obtain powder with the particle size of 100 nm-10 mu m;
(1b) and drying the mixed powder at 60-80 ℃.
According to an embodiment of the present invention, in the step (1a), the mass ratio of the alumina spheres to the raw material to the absolute ethyl alcohol may be (5-15): 3-8): 2-6, for example, 10:5: 4.
According to an embodiment of the present invention, in the step (2), the sieving is preferably performed by a 100-200 mesh sieve, such as a 150 mesh sieve.
According to an embodiment of the present invention, the step (2) may include placing the powder obtained after the sieving in a crucible (e.g., an alumina crucible) and calcining;
preferably, the roasting temperature is 1000-1200 ℃, and the roasting time is 1-12 h; for example, the roasting temperature is 1050-1150 ℃, such as 1100 ℃, and the roasting time is 2-5 hours, such as 3 hours.
According to an embodiment of the present invention, the step (3) may include at least one of the following steps:
(3a) grinding the powder obtained after roasting, and sieving (such as 100-200 mesh sieve) to uniformly disperse the powder;
preferably, the grinding can be performed in a ball mill or an agate mortar; or the combination of the two grinding modes;
(3b) adding 1-45% (such as 2-10%, for example 5%) PVA aqueous solution by mass percent into the uniformly dispersed powder, grinding, granulating, and sieving (such as 40-80 mesh sieve, such as 60 mesh sieve);
(3c) tabletting the sieved and granulated mixed material to prepare a ceramic blank;
preferably, the diameter of the ceramic blank body can be 10-15 mm, and the thickness can be 0.8-1.5 mm; for example, the ceramic green body may have a diameter of 12mm and a thickness of 1 mm;
preferably, tableting may be performed using a powder tableting machine; the tabletting pressure of the powder tabletting machine can be 5-20 MPa, such as 10 MPa;
(3d) removing glue from the ceramic blank;
preferably, the rubber discharging is carried out at 300-800 ℃, such as 500-700 ℃ (such as 600 ℃); the heating rate can be 1-10 ℃/min, such as 5 ℃/min; the time for the degumming treatment can be 0.5-12 h, such as 1-5 h, such as 3 h; and naturally cooling after removing the glue.
According to an embodiment of the present invention, in step (4), the ceramic green body after the binder removal is placed in an alumina crucible for sintering, for example, in an alumina crucible using nickel oxide as a padding material for sintering.
Preferably, the sintering temperature can be 1300-1500 ℃, and the sintering time is 1-5 h; for example, the sintering temperature is 1400 ℃, and the sintering time is 3 h; the heating rate can be 1-10 ℃/min, such as 5 ℃/min;
preferably, the temperature reduction treatment after sintering can be performed in stages, for example, the temperature of the sample is reduced to 1000-1200 ℃, such as 1100 ℃; the cooling rate is 2-5 ℃/min, such as 2 ℃/min, so that the cracking of the sample caused by the excessively high cooling speed of the sample along with the hearth at high temperature is prevented; then, the sample was allowed to cool naturally to room temperature.
The invention also provides the use of the above-described neodymium lanthanum doped nickelate ceramic as a dielectric ceramic, for example as a capacitor (e.g. energy storage capacitor) material.
The invention has the advantages of
The invention provides lanthanum-neodymium doped nickelate ceramic and a preparation method and application thereof, wherein the chemical formula of the lanthanum-neodymium doped nickelate ceramic is L a2-xNdxNiO4Wherein x is more than or equal to 0.1 and less than or equal to 0.6; the preparation method of the lanthanum-neodymium doped nickelate ceramic is convenient to operate, the synthesis process is simple, the prepared lanthanum-neodymium doped nickelate ceramic is uniform in particle size, controllable in particle size and less in pollution, meanwhile, the hard agglomeration phenomenon which is easy to occur in a liquid phase can be avoided or reduced, and the cost is low; the lanthanum neodymium doped nickelate ceramics can be used as dielectric ceramics, for example, as capacitor (e.g., energy storage capacitor) materials.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a method of making a neodymium lanthanum doped nickelate ceramic in accordance with the present invention.
FIG. 2 shows an La-Nd doped nickelate ceramic (L a) in accordance with example 1 of the present invention2-xNdxNiO4And X ═ 0.1, 0.2, 0.3, and 0.4).
FIG. 3 shows an La-Nd doped nickelate ceramic (L a) in accordance with example 1 of the present invention2-xNdxNiO4And x is 0.1).
FIG. 4 shows a lanthanum neodymium doped nickelate ceramic (L a) in accordance with example 2 of the present invention2-xNdxNiO4X ═ 0.1, 0.2, 0.3, and 0.4) the dielectric loss versus frequency plot at room temperature.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. In addition, it should be understood that various changes or modifications can be made by those skilled in the art after reading the description of the invention, and the equivalents also fall into the protection scope of the invention.
Unless otherwise indicated, the starting materials or reagents used in the following examples are either commercially available or prepared by known methods.
The instrument test method comprises the following steps:
x-ray diffraction spectra Using a Rigaku Miniflex600 instrument, the specific conditions were as follows: the test range is 5-85 DEG, and the test speed is 5 DEG/min. The scanning electron microscope atlas uses a Hitachi novel high-resolution field emission scanning electron microscope SU8010 instrument, and the specific conditions are as follows: resolution ratio: 1.0nm/15 kV-1.3 nm/1 kV; multiplying power: 80x to 2000000 x.
Example 1 preparation example
(1) L a2O3、Nd2O3NiO raw material powders were each represented by the chemical formula L a2-xNdxNiO4(wherein x is 0.1, 0.2, 0.3 and 0.4, respectively) weighing the ingredients;
(2) putting the raw materials prepared in the step (1) into a ball milling tank, adding alumina balls and absolute ethyl alcohol (wherein the mass ratio of the alumina balls to the raw materials to the absolute ethyl alcohol is 10:5:4), ball milling for 24 hours, and putting the ball-milled powder into an oven to dry at 70 ℃;
(3) sieving the powder prepared in the step (2) by a 150-mesh sieve, roasting in an alumina crucible at 1100 ℃ for 3h, and then putting into a ball milling tank for ball milling;
(4) and (4) drying the powder subjected to ball milling in the step (3), grinding the powder in an agate mortar to uniformly disperse the powder, weighing the powder, adding a PVA (polyvinyl alcohol) aqueous solution with the mass percent of 5%, grinding and granulating the powder, and sieving the powder with a 60-mesh sieve. Pressing the granulated powder into a ceramic blank with the diameter of 12mm and the thickness of 1mm in a powder tablet machine under the pressure of 10MPa, then placing the ceramic blank into an alumina crucible, and carrying out glue discharging treatment for 3 hours at the temperature of 600 ℃ (the heating rate is 5 ℃/min, and the ceramic blank is naturally cooled);
(5) and (3) putting the ceramic blank body subjected to the glue discharging and prepared in the step (4) into an alumina crucible using nickel oxide as a padding material, placing the alumina crucible into a high-temperature electric furnace, keeping the temperature for 3h (the heating rate is 5 ℃/min) at 1400 ℃, sintering, cooling to 1100 ℃ at the speed of 2 ℃/min, and naturally cooling the sample to room temperature along with the hearth to obtain the neodymium-lanthanum-doped nickelate ceramic.
FIG. 2 shows an La-Nd doped nickelate ceramic (L a) in accordance with example 1 of the present invention2-xNdxNiO4X is 0.1, 0.2, 0.3 and 0.4) from which the lanthanum neodymium doped nickelate ceramic (L a) was prepared2-xNdxNiO4X ═ 0.1, 0.2, 0.3, and 0.4) has a tetragonal crystal phase, comparable to L a in standard cards2NiO4The diffraction patterns are substantially coincident.
FIG. 3 shows an La-Nd doped nickelate ceramic (L a) in accordance with example 1 of the present invention2-xNdxNiO4X is 0.1) in a scanning electron microscope image, L a2-xNdxNiO4The ceramic has a uniform crystal grain size of about 5 μm when x is 0.1.
Example 2 performance testing example
And (2) grinding and polishing the surface of the most compact sintered sample by using alumina waterproof abrasive paper, cleaning by using ultrasonic waves, drying, coating a layer of low-temperature silver paste on the upper surface and the lower surface of the sample, sintering at 600 ℃ for 30min in an air environment, cooling to room temperature along with a furnace to prepare a sample surface silver electrode, and flattening the silver electrode on A4 paper. And (3) testing the dielectric properties of the ceramic wafer under different frequencies by using a precision impedance analyzer (Agilent 4294A).
L a in FIG. 42-xNdxNiO4(x ═ 0.1, 0.2, 0.3, and 0.4) dielectric loss versus frequency plot at room temperature. As can be seen, at room temperature, the dielectric loss decreases first and then with increasing frequencyIncrease by a value between 10-1～100A minimum of 10-1Left and right.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A lanthanum neodymium doped nickelate ceramic with a chemical formula of L a2-xNdxNiO4Wherein x is more than or equal to 0.1 and less than or equal to 0.4, the grain size of the ceramic is 3-8 mu m, and the lanthanum-neodymium doped nickelate ceramic has a tetragonal phase;
the lanthanum-neodymium doped nickelate ceramic is prepared by the following method:
(1) mixing lanthanum source, neodymium source and nickel source raw materials with alumina balls and absolute ethyl alcohol, and carrying out ball milling to obtain powder;
(2) sieving the powder obtained in the step (1) and roasting;
(3) adding a polyvinyl alcohol aqueous solution into the powder obtained after roasting in the step (2), grinding, granulating, sieving, pressing into a ceramic blank, and removing the glue to obtain a ceramic blank after removing the glue;
(4) sintering the ceramic blank body subjected to the glue discharging and obtained in the step (3) to obtain lanthanum-neodymium doped nickelate ceramic;
the step (1) comprises the following steps:
(1a) adding lanthanum source, neodymium source and nickel source raw materials into a ball milling tank, adding alumina balls and absolute ethyl alcohol, and carrying out ball milling for 1-48 h to obtain powder with the particle size of 100 nm-10 mu m;
the alumina balls are prepared from (5-15) anhydrous ethanol and (3-8) anhydrous ethanol in a mass ratio of (2-6);
(1b) drying the slurry at 60-80 ℃;
in the step (2), sieving by a sieve of 100-200 meshes;
the step (2) comprises placing the powder obtained after sieving in a crucible and roasting;
wherein the roasting temperature is 1000-1200 ℃, and the roasting time is 1-12 h;
the diameter of the ceramic blank is 10-15 mm, and the thickness of the ceramic blank is 0.8-1.5 mm;
tabletting by using a powder tabletting machine; the tabletting pressure of the powder tabletting machine is 5-20 MPa;
the rubber discharging is carried out at the temperature of 300-800 ℃; the heating rate is 1-10 ℃/min; the glue discharging treatment time is 0.5-12 h; naturally cooling after rubber discharging;
in the step (4), the ceramic blank after the binder removal is placed in an alumina crucible for sintering;
the sintering temperature is 1300-1500 ℃, and the sintering time is 1-5 h; the heating rate is 1-10 ℃/min.
2. The ceramic of claim 1, wherein x is 0.1, 0.2, 0.3, or 0.4.
3. The ceramic of claim 1, wherein in step (1), the lanthanum source material is selected from lanthanum oxide L a2O3(ii) a The neodymium source material is selected from neodymium oxide Nd2O3(ii) a The nickel source raw material is selected from nickel oxide NiO.
4. The ceramic according to claim 1, wherein the firing temperature is 1050-1150 ℃ and the firing time is 2-5 hours.
5. The ceramic of claim 1, step (3) comprising the steps of:
(3a) grinding and sieving the powder obtained after roasting to uniformly disperse the powder;
(3b) adding 1-45% polyvinyl alcohol aqueous solution by mass percent into the uniformly dispersed powder, grinding, granulating and sieving;
(3c) tabletting the sieved and granulated mixed material to prepare a ceramic blank;
(3d) and (5) removing the glue from the ceramic blank.
6. The ceramic of claim 1, wherein the ceramic green body has a diameter of 12mm and a thickness of 1 mm.
7. The ceramic according to claim 1, wherein the binder removal is carried out at 500-700 ℃; the heating rate is 5 ℃/min; the glue removing treatment time is 1-5 h.
8. The ceramic according to claim 1, wherein the sintering temperature is 1400 ℃ and the sintering time is 3 h; the heating rate was 5 ℃/min.
9. The ceramic of claim 1, wherein the sample is first cooled to 1000-1200 ℃ at a cooling rate of 2-5 ℃/min; then, the sample was allowed to cool naturally to room temperature.
10. Use of a neodymium lanthanum doped nickelate ceramic according to any of claims 1-9 as a dielectric ceramic.
11. Use according to claim 10 as a capacitor material.
12. A capacitor material comprising the neodymium lanthanum doped nickelate ceramic of any of claims 1-9.
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