Method for Improving Dielectric Temperature Stability of Barium Titanate-Based Ceramics Based on Composition Gradient

Abstract

The invention discloses a method for improving the dielectric temperature stability of barium titanate-based ceramic based on component gradient. The method comprises the following steps: doping TiO2 and BaCO3 base materials with Sn<4+> ions, carrying out a traditional solid phase synthesis preparation technology, and pre-burning the synthesized solid to obtain barium titanate-based ceramic powders having different curie temperatures; designing the components and the sequence of gradient materials by adopting a component corresponding to the tricritical point (tricritical effect) of the above sysyem as a core, tiling the powders layer by layer, and compacting the tiled powders to form a block; and carrying out solid phase sintering to obtain barium titanate-based gradient ceramic, and cutting the obtained cylindrical ceramic along the component change direction by a fretsaw cutter to obtain two flat cross sections in order to realize the improvement the dielectric temperature stability of ferroelectric ceramic through parallel component gradient. The method improves the temperature stability on the basis of keeping the high dielectric constant of the barium titanate-based ceramic, provides a new idea for the optimization of the performances of multilayer ceramic capacitors (MLCCs), and is simple to operate.

Description

technical field [0001] The invention belongs to the field of electronic ceramic materials, and in particular relates to a method for improving the dielectric temperature stability of barium titanate-based ceramics based on composition gradients. Background technique [0002] Barium titanate series electronic ceramics is a new type of functional ceramics developed in recent decades. It is one of the most widely used perovskite ferroelectrics and is known as "the pillar of the electronic ceramics industry". Barium titanate ceramic materials can be used in thermistors (PTCR), piezoelectric devices, multilayer ceramic capacitors (MLCC), electric Scalable devices, electro-optical devices and DRAM devices. In recent years, the miniaturization of mobile electronic devices has made MLCCs gradually develop in the direction of low cost, miniaturization, and large capacity. Because barium titanate ceramics have a high dielectric constant, can store a large amount of electrical energy...

AI Technical Summary

Problems solved by technology

For the existing chemical methods, whether it is a small amount of doping or a "shell-core" structure, the improved dielectric temperature spectrum of ceramics cannot be clearly predicted, and the results are accidental.

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