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氧化铈复合钛酸镧钙介质陶瓷的微波性能
作者:钱俊 胡明哲 顾豪爽  
单位:湖北大学物理与电子技术学院 湖北大学物理与电子技术学院 湖北大学材料物理与化学省级重点实验室 武汉430062 
关键词:复合钙钛矿  微波介质陶瓷  微波介电性能  温度补偿 
分类号:TQ174.1
出版年,卷(期):页码:2007,35(1):41-45
DOI:
摘要:

以1%(质量分数)CuO为烧结助剂,采用固相合成法制备了(1–x)Ca0.6La0.27TiO3+xCeO2单纯和复合微波介质陶瓷材料。研究了此体系陶瓷的微观结构和微波介电性能。研究表明:当x从0增加到1时,体系的相对介电常数εr从111.2线性降低到22.5;谐振频率温度系数τf从x=0时的正值+297.8×10–6/℃线性变化为x=1的负值–54.2×10–6/℃;而无载品质因数与谐振频率乘积Qf值则呈非线性增加。当x=0.85,且在1400℃烧结,可获得εr=32.2,Qf=6682GHz,τf=+5×10–6/℃的新型微波介质陶瓷。

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Simple and complex microwave dielectric ceramics of (1–x)Ca0.6La0.27TiO3+xCeO2 were prepared by conventional solid-state reaction method with 1% in mass CuO as a sintering additive. The microstructures and microwave dielectric properties of the serial ceramics were investigated. The results show that the dielectric constant εr decreases linearly from 111.2 to 22.5 as the x value increases from 0 to 1 and the temperature coefficient of resonance frequency τf also varies linearly from a positive value of +297.8×10–6/℃ at x=0 to a negative value of ?54.2×10–6/℃ at x=1. Also, as the x value increased, the product of unloaded quality factor and resonance frequency Qf of the ceramics increased nonlinearly. When the ceramics with x=0.85 were sintered at 1 400 ℃, it had a relative dielectric constant εr of 32.2, a Qf value of 6 682 GHz and a near zero τf value of 5×10–6/℃.

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基金项目:
国家自然科学基金(50572026);; 湖北省教育厅(030094105)资助项目。
作者简介:
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参考文献:

[1]HUANG Chengliang,PAN Chunglong,HSU Juifeng.Dielectric prop-erties of(1–x)(Mg0.95Co0.05)TiO3–xCaTiO3[J].Mater Res Bull,2002,37(15):2483–2490. [2]HUANG Chengliang,TSAI Jsungta,CHEN Yuanbin.Dielectric propertiesof(1–y)Ca(1–x)La2x/3TiO3ceramic system at microwave frequency[J].Ma-ter Res Bull,2001,36(3–4):547–556. [3]SEBASTIAN M T,SANTHA N,BIJUMON P V,et al.Microwave dielectric properties of(1–x)CeO2–CaTiO3and(1–x)CeO2–xSm2O3ceramics[J].J Eur Ceram Soc,2004,24(9):2583–2589. [4]HUANG Chengliang,CHIANG Kuohau.Microwave dielectric proper-ties and microstructures of Mg2Ta2O6ceramics with CuO addition[J].Mater Chem Phys,2005,92(2–3):373–377. [5]HARROP P J.Temperature coefficients of capacitance of solids[J].J Mater Sci,1960,4:370–374. [6]MICHIURA N,TATEKAWA T,HIGUCHI Y,et al.Role of donor and acceptor ions in the dielectric loss tangent of(Zr0.8Sn0.2)TiO4dielectric resonator material[J].J Am Ceram Soc,1995,78(3):793–796. [7]HUANG Chengliang,WENG Minhung.The effect of PbO loss on microwave dielectric properties of(Pb,Ca)(Zr,Ti)O3ceramics[J].Mater Res Bull,2001,36(3–4):683–691. [8]YOON S O,YOON J H,KIM KS,et al.Microwave dielectric proper-ties of LiNb3O8ceramics with TiO2additions[J].J Eur Ceram Soc,2006,26(10–11):2031–2034. [9]KUANG Xiaojun,JING Xiping.Dielectric loss spectrum of ceramic MgTiO3investigated by AC impedance and microwave resonator measurements[J].J Am Ceram Soc,2006,89(1):241–246.

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