Rare earth ion doped barium titanate-based ceramic material and preparation method thereof

By employing a method for preparing barium titanate-based ceramic materials co-doped with rare earth ions and multiple elements, the problems of low Curie temperature and unstable dielectric constant of barium titanate-based ceramics have been solved, resulting in ceramic materials with high dielectric constant and low loss, suitable for high-temperature and high-stability capacitors.

CN121651920APending Publication Date: 2026-03-13LIAONING SILICATE RES INST
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Patent Information

Application Number
CN202512040373.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-31
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

Pure barium titanate-based ceramics have a low Curie temperature and their dielectric constant varies greatly with temperature and frequency, making it difficult to meet the requirements of high-temperature, high-stability capacitors.

Method used

High-purity tetragonal barium titanate powder was prepared by hydrothermal synthesis using multi-element co-doping technology with rare earth ions Eu, Dy and synergistic doping elements Na, Mg, Bi, Nb, Co and La. Combined with high-energy ball milling, pressing and solid-state sintering processes, the lattice and defect structure were controlled to improve the Curie temperature and dielectric properties of the material.

Benefits of technology

It achieves high dielectric constant and low loss over a wide temperature range, meeting the application requirements of high-end multilayer ceramic capacitors and is suitable for high-temperature and high-stability capacitors.

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Abstract

The invention relates to the technical field of barium titanate-based ceramic preparation, in particular to a rare earth ion doped barium titanate-based ceramic material and a preparation method thereof.High-purity tetragonal-phase barium titanate is prepared through a hydrothermal synthesis process, doped ions comprise two rare earth ion elements including europium and dysprosium, and one or more of sodium, magnesium, bismuth, niobium, cobalt, lanthanum and the like are cooperatively doped; barium titanate powder and ion-doped oxide powder are mixed according to a certain proportion, and the ion-doped barium titanate ceramic is prepared through solid-phase sintering. By adopting the formula and the preparation method disclosed by the invention, a barium titanate-based ceramic capacitor product with excellent dielectric property, high stability and low loss can be obtained, and the preparation method is suitable for preparing a high-temperature and high-performance multilayer ceramic capacitor.
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