Dielectric nonlinear capacitor ceramic material and its making technique

A ceramic capacitor and ceramic technology, which is applied in the field of materials and components for electrical energy storage and release, can solve the problems of low electrical breakdown strength, wide electrical hysteresis, and difficulty in reaching capacitor materials.

Inactive Publication Date: 2005-10-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of traditional dielectric materials used to make capacitors are as follows: (1) For linear dielectric materials, their dielectric coefficients are usually relatively small, and it is necessary to increase their energy storage density by applying a high electric field strength, which affects the durability of the material. (2) For ferroelectric materials with high dielectric coefficient, although its dielectric coefficient is relatively high under low field strength conditions,

Method used

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  • Dielectric nonlinear capacitor ceramic material and its making technique
  • Dielectric nonlinear capacitor ceramic material and its making technique
  • Dielectric nonlinear capacitor ceramic material and its making technique

Examples

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Embodiment 1

[0033] Embodiment 1: Nonlinear relationship of polarization intensity of antiferroelectric ceramics of the present invention as a function of applied voltage

[0034] Partially replace the positive divalent lead element in the lead zirconate titanate compound with positive trivalent lanthanum, and partially replace the positive tetravalent zirconium element in the lead zirconate titanate compound with positive tetravalent tin element to form lanthanum-modified zirconium tin lead titanate solid solution, the chemical composition expression that obtains the antiferroelectric ceramic capacitor of the present invention is (Pb 0.925 La 0.05 )[(Zr 0.70 sn 0.30 ) 0.85 Ti 0.15 ]O 3 . Using oxides PbO and ZrO containing the above elements 2 , SnO 2 、TiO 2 , La 2 o 3 After weighing and mixing according to the molar ratio of the elements, the bulk antiferroelectric ceramics are produced through ball milling, pre-sintering, secondary ball milling, granulation, compacting, plast...

Embodiment 2

[0036] Embodiment 2: the embodiment of antiferroelectric ceramics of the present invention as discharge capacitor

[0037] Use positive trivalent lanthanum and positive divalent strontium to partially replace the positive divalent lead element in the lead zirconate titanate compound, and use positive tetravalent tin elements to partially replace the positive tetravalent zirconium element in the positive zirconate lead titanate compound to form a common combination of lanthanum and strontium. Doping modified lead zirconium tin titanate solid solution to obtain the chemical composition expression of the antiferroelectric ceramic capacitor of the present invention is (Pb 0.91 La 0.02 Sr 0.06 )(Zr 0.54 sn 0.30 Ti 0.16 )O 3 . The antiferroelectric ceramics and capacitors were obtained under conditions similar to those of the ceramics and capacitors in Example 1. The antiferroelectric ceramics were discs with a thickness of 0.060 cm and an area of ​​7.80 cm. After applying a ...

Embodiment 3

[0038] Embodiment 3: the embodiment of antiferroelectric ceramics of the present invention as discharge capacitor

[0039] The difference between this example and Example 2 is that the positive divalent lead element in the lead zirconate titanate compound is partially replaced with the positive divalent barium to form a co-doped and modified zirconium tin lead titanate solid solution with lanthanum and barium. The chemical composition expression of antiferroelectric ceramic capacitor of the present invention is (Pb 0.92 La 0.04 Ba 0.02 )(Zr 0.56 sn 0.40 Ti 0.12 )O 3 , all the other are with embodiment 2.

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Abstract

This invention discloses an anti-ferroelectric ceramic capacitor material and its preparation technology, which applies Sn of positive four valency to replace Zr of positive 4 valency, applies the positive 3 valency La to replace 2 valency Pb in the compound of Pb(Zr, Ti) O3 to form a multi-component solid solution with Pb vacancy. The balanced formula of the charge and the valency is: (Pb1-3 2/2Laz)[(Zri-ysny)1-Tix]O3, in which, x varies between 0.06`0.20, y: 0.2010.40, z varies between 0.02-0.08, or positive 2 valency Sr or Ba is added to replace 2 valency Pb in Pb(zr, Ti) O3, the formula is [(Pb1-wBw)1-3z/2Laz][Zr1-ySny]1-xTix ]O3, B expresses Sr or Ba of 2 valency, w varies between 0.02-0.12. A conventional electronic ceramic preparation method is applied in the method.

Description

technical field [0001] The invention belongs to the technical field of materials and components for electric energy storage and release. In particular, it relates to the ceramic material and its manufacturing process for making dielectric nonlinear capacitors. Background technique [0002] A capacitor is a component used to store and release electrical energy and is widely used in electronics and power instruments. Energy storage density (electrical energy stored per unit volume) is an important performance indicator of a capacitor. The higher the energy storage density of a capacitor, the greater its ability to store and release electrical energy. With the development of high efficiency and miniaturization of electronic and electric equipment, the industry has an urgent need for capacitors with high energy storage density and high output electric power. At present, the materials used to make capacitors are mainly organic and inorganic dielect...

Claims

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Application Information

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IPC IPC(8): H01G4/12
Inventor 冯玉军徐卓魏晓勇姚熹
Owner XI AN JIAOTONG UNIV
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