MgF2掺杂对0.95MgTiO3-0.05CaTiO3陶瓷结构与微波性能的影响

冉文; 刘凡; 李昊; 刘绍军

doi:10.19976/j.cnki.43-1448/TF.2023022

粉末冶金材料科学与工程 >

2023 , Vol. 28 >Issue 3: 253 - 261

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2023022

工艺技术

MgF₂掺杂对0.95MgTiO₃-0.05CaTiO₃陶瓷结构与微波性能的影响

冉文 ,
刘凡 ,
李昊 ,
刘绍军

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中南大学粉末冶金国家重点实验室,长沙 410083

收稿日期: 2023-03-17

修回日期: 2023-04-23

网络出版日期: 2023-07-06

基金资助

湖南省自然科学基金资助项目(2021JJ30831)

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Effects of MgF₂ doping on structure and microwave property of 0.95MgTiO₃-0.05CaTiO₃ ceramics

RAN Wen ,
LIU Fan ,
LI Hao ,
LIU Shaojun

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State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Received date: 2023-03-17

Revised date: 2023-04-23

Online published: 2023-07-06

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摘要

采用传统固相合成法制备MgF₂掺杂0.95MgTiO₃-0.05CaTiO₃(95MCT)微波陶瓷,结合X射线衍射谱、拉曼光谱、X射线光电子能谱、扫描电镜及矢量网络分析等表征技术,系统研究MgF₂掺杂对95MCT陶瓷烧结温度、晶体结构、微观形貌与微波性能的影响。结果表明：少量MgF₂掺杂能够促进陶瓷晶粒均匀生长,抑制Ti⁴⁺离子向Ti³⁺离子转变,增强[TiO₆]八面体中Ti—O键的结合强度,从而使95MCT陶瓷的品质因子由30 335 GHz提高至89 470 GHz。1 225 ℃烧结的MgF₂质量分数为1%的95MCT陶瓷具有优异的综合微波性能：相对介电常数ε_r 约为19.74,品质因子Q×f 值约为89 470 GHz,谐振频率温度系数τ_f约为-10.2×10^-6 ℃^-1。

关键词： MgTiO₃-CaTiO₃陶瓷; MgF₂掺杂; [TiO₆]八面体; 烧结温度; 微波性能

本文引用格式

冉文 , 刘凡 , 李昊 , 刘绍军 . MgF₂掺杂对0.95MgTiO₃-0.05CaTiO₃陶瓷结构与微波性能的影响[J]. 粉末冶金材料科学与工程, 2023 , 28(3) : 253 -261 . DOI: 10.19976/j.cnki.43-1448/TF.2023022

Abstract

MgF₂ doped 0.95MgTiO₃-0.05CaTiO₃ (95MCT) microwave ceramics were synthesized by solid-phase reaction. The effects of MgF₂ doping on the sintering temperature, crystal structure, microstructure and microwave properties of 95MCT ceramics were characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and vector network analyzer. The results show that a small amount of MgF₂ doping can promote the uniform growth of ceramic grains. The addition of MgF₂ inhibits the transition of Ti⁴⁺ ions to Ti³⁺ ions and enhances the Ti—O bonding strength of [TiO₆] octahedra, thus significantly improving the quality factor of ceramics from 30 335 GHz to 89 470 GHz. MgF₂ doped with 1% (mass fraction) of 95MCT ceramic sintered at 1 225 ℃ has excellent microwave properties: the relative permittivity ε_r is about 19.74, the Q×f value is about 89 470 GHz, and the resonant frequency temperature coefficient τ_f is about -10.2×10^-6 ℃^-1.

Key words： MgTiO₃-CaTiO₃ceramic; MgF₂ doping; [TiO₆] octahedra; sintering temperature; microwave property

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