High dielectric constant X8R type MLCC medium material and preparation method

Abstract

The invention relates to a high dielectric constant X8R type MLCC medium material and a preparation method, the high dielectric constant X8R type MLCC medium material takes 100 weight parts of barium titanate as a base material, and the medium material comprises the following components by weight: 1.6-2.5 parts of niobium cobalt compound, 0.722-1.805 parts of titanium bismuth sodium compound, 1.25-2.0 parts of zirconium calcium compound, 1-3 parts of glass powder, 0.369-1.2 parts of one or a plurality of oxides of Ce, Yb, Dy and Ho and 0.1-0.25 part of manganese carbonate. The key and core of the present invention are characterized in that a proper amount of manganese carbonate, rare earth elements and a zirconium calcium compound are added, the rare earth element can be taken as a donor or an acceptor in the barium titanate dielectric ceramic material for doping and modifying, the movement of the intrinsic oxygen vacancy and the oxygen vacancy brought by other B site donor doping can be inhibited, the insulation resistivity of a material system, the ageing resistance and the reduction resistance of a material system can be increased, and the method provided by the invention can be used for making silver-palladium electrodes and nickel electrodes MLCC.

Description

technical field

[0001] The invention relates to the field of functional ceramics, in particular to a high dielectric constant X8R type MLCC dielectric material and a preparation method thereof. Background technique

[0002] In recent years, X7R (working temperature range -55°C ~ 125°C, capacity temperature change rate within ±15%) MLCC materials have been extensively studied and successfully applied at home and abroad, among which barium titanate-based materials are not used in production and application. It will cause harm to the environment and human body, and the performance of the prepared MLCC is excellent and stable, so it has attracted widespread attention and developed rapidly. However, with the continuous development of national defense technology, automobile industry, etc., the demand for MLCCs that can be applied in harsh working environments is becoming more and more extensive. For example, various vehicle-mounted electronic control systems include ABS, engine e...

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