(Na1/2Bi1/2) TiO3/BaTiO3 ceramic dielectric material and preparation of capacitor thereof

Abstract

The invention relates to a (Na1 / 2Bi1 / 2) TiO3 / BaTiO3 ceramic dielectric material and a preparation of a capacitor thereof. The ceramic dielectric material contains the following components of BaCO3, SrCO3, Bi2O3, SnO2, TiO2, (Na1 / 2Bi1 / 2) TiO3, Y2O3, ZnO and MnO2, and the sum of the mole percents of the components is 100%. The method for preparing the capacitor by using the material comprises the following steps of synthesizing the (Na1 / 2Bi1 / 2) TiO3; preparing a pre-synthesizing material by using the BaCO3, the SrCO3, the Bi2O3, the SnO2 and the TiO2, (Na1 / 2Bi1 / 2) TiO3; preparing a dry grinding material by using the Y2O3, the ZnO, MnO2and the pre-synthesizing material; adding a polyvinyl alcohol solution in the dry grinding material, and then pelleting, screening, pressing and sintering and preparing a silver electrode to obtain the capacitor. The ceramic dielectric material has the characteristics of high dielectric constant, low dielectric loss and low temperature change rate of the dielectric constant. The prepared capacitor has good performance parameters.

Description

technical field [0001] The present invention relates to a kind of (Na 1 / 2 Bi 1 / 2 )TiO 3 / BaTiO 3 The invention relates to a preparation method of a ceramic dielectric material and a capacitor thereof, belonging to the technology of ceramic dielectric materials and capacitors. Background technique [0002] Capacitors are essential electronic devices in electronic equipment. Commonly used capacitors are divided into paper capacitors, mica capacitors, ceramic capacitors, electrolytic capacitors, etc. according to the medium. Among them, ceramic dielectric capacitors have the characteristics of small size, good heat resistance, high insulation resistance, and low price. With the development of the electronics industry, ceramic dielectric capacitors have been widely used in electronic equipment. Traditional ceramic dielectric materials, especially medium and high voltage ceramic capacitors contain lead elements that are harmful to the environment and human health [Peng Jiag...

AI Technical Summary

Problems solved by technology

In recent years, scientists from all over the world are developing lead-free ceramic dielectric materials with superior performance to replace traditional lead-containing ceramic dielectric materials, but their performance is poor, and they still cannot achieve the dielectric properties of lead-containing ceramic dielectric materials. For example, the existing SrTiO 3 The dielectric loss (tanδ) of the base ceramic dielectric material is small, but the dielectric constant (ε r ) is also smaller [[1] Xiao Jun, Zhang Qilong, etc. New BST-based high-voltage capacitor ceramics [J]. Electronic Components and Materials, 2006, 25(11): p47-49; [2] Wei Chen, Xi Yao and Xiaoyong Wei.Tunability and ferroelectric relaxorproperties of bismuth strontium titanate ceramics[J].APPLIED PHYSICSLETTERS 2007, (9)0182902】; BaTiO 3 The dielectric constant of the base ceramic dielectric material (ε r ) is large, but the dielectric loss (tanδ) and the temperature change rate of the dielectric constant (Δε / ε) are relatively large [Zhang Jilin, Mao Zuyou, etc. AC high-voltage dielectric ceramics [J]. Electronic Components and Materials, 2002, 21( 6): p1-3]