Low dielectric ultra-low loss high temperature stable dysprosium and zinc niobate co-doped barium titanate ceramic and method of making

By doping barium titanate ceramics with ZnNb2O6 and Dy2O3, barium titanate ceramics co-doped with dysprosium oxide and zinc niobate were prepared, which solved the problems of high dielectric constant, high loss and poor stability of barium titanate-based ceramics, and achieved ultra-low dielectric loss and high frequency stability, which is suitable for new NPO type capacitors.

CN122277245APending Publication Date: 2026-06-26SHAANXI NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHAANXI NORMAL UNIV
Filing Date
2026-04-28
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing barium titanate-based ceramic materials cannot simultaneously meet the requirements of low dielectric constant, ultra-low dielectric loss, and high temperature stability, thus failing to meet the stringent performance requirements of the new NPO type capacitor.

Method used

A method for preparing barium titanate ceramics co-doped with dysprosium oxide and zinc niobate was adopted. By synergistically doping ZnNb2O6 and rare earth oxide Dy2O3 into barium titanate ceramics, and using the traditional solid-state sintering method, BaTiO3-based ceramic materials with ultra-low dielectric loss and high breakdown field strength were prepared.

Benefits of technology

It achieves a dielectric loss reduction to 0.0002, a breakdown field strength increase to 300-350 kV/cm, and a temperature stability of ΔC/C20℃≤±0.5% within the range of -150-200℃, meeting the application requirements of the new NPO type capacitor. Moreover, the process is simple and easy to industrialize.

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Abstract

This invention discloses a low-dielectric-value, ultra-low-loss, high-temperature-stability barium titanate and zinc niobate co-doped barium titanate ceramic, and its preparation method. The ceramic material has the general formula 0.85BaTiO3-0.15ZnNb2O6-xDy2O3, where x ranges from 0.008 to 0.02. It is prepared using a traditional solid-state sintering method, which is simple, reproducible, and has a high yield. This invention introduces Zn into the BaTiO3 matrix. 2+ 、Nb 5+ and Dy 3+ Multi-doping was performed to achieve lattice manipulation and defect engineering in the BaTiO3 matrix. When x=0.15, the resulting ceramic material maintained a suitable dielectric constant. e r While achieving a dielectric loss of 138, it also achieves excellent overall performance: extremely low dielectric loss (tanδ=0.0002, 1kHz), and excellent temperature stability (Δδ). C / C 20°C With a voltage rating of ≤ ±0.5% (-150~200°C) and a high breakdown field strength of 330kV / cm, these performance indicators fully meet the highest standards of the new NPO type ceramic capacitors, and have significant application value and market prospects in high-end fields such as microwave communication, automotive electronics and aerospace.
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