Dielectric nonlinear capacitor ceramic material and its making technique

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...

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, its dielectric coefficient is high under high field strength conditions. The electrical coefficient will drop significantly, and ferroelectric ceramics with high dielectric coefficient usually have lower electrical breakdown strength

However, lead zirconate titanate antiferroelectric ceramics have problems such as narrow antiferroelectric-ferroelectric phase transition temperature range, wide hysteresis, and large strain, and it is difficult to meet the requirements of capacitor materials.

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