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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Nd3+A位置换对(Pb0.5Ca0.5)(Fe0.5Nb0.5)O3陶瓷微波介电性能的影响

杨秋红1; 金应秀2; 徐军3   

  1. 1. 上海大学材料学院, 上海 201800; 2. 韩国京畿大学陶瓷工程系, 韩国水原 442—760; 2. 中科院上海光学精密机械研究所 上海 201800
  • 收稿日期:2002-07-31 修回日期:2002-10-17 出版日期:2003-09-20 网络出版日期:2003-09-20

Effect of A-site Substitution by Nd~3+ on the Microwave Dielectric Properties of (Pb0.5Ca0.5)(Fe0.5Nb0.5)O3 Ceramics

YANG Qiu-Hong1; KIM Eung-Soo2; XU Jun3   

  1. 1. School of Materials Science and Engineering; Shanghai University; Shanghai 201800; China; 2. Department of Materials Engineering; Kyonggi University; Suwon 442-760; Korea; 3. Shanghai Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; China
  • Received:2002-07-31 Revised:2002-10-17 Published:2003-09-20 Online:2003-09-20

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摘要： 研究了Nd3+离子A位置换改性(Pb0.5Ca0.5)(Fe0.5Nb0.5)O3陶瓷的微波介电性能.[(Pb0.5Ca0.5)1-xNdx](Fe0.5Nb0.5)O3(PCNFN)陶瓷的微波介电性能得到改善是由于少量过剩的Nd3+与(Pb,Ca)2+的固溶能够消除氧空位.当x=0.02时,能够形成单相的钙钛矿相,随着Nd3+置换量的增加,过剩的Nd3+将导致第二相焦绿石的形成,焦绿石会恶化PCNFN的微波介电性能.PCNFN介电性能随x的增加而下降是由于焦绿石相随x增加的结果.当x=0.02-0.05,PCNFN陶瓷有很好的微波介电性能,介电常数K>100,Qf值为5385-5797GHz,频率温度系数TCF随Nd3+含量的增加从正的变为负的.

关键词: （Pb, Ca, Nd）（Fe, Nb）O3, 微波介质陶瓷, 钙钛矿

Abstract: Microwave dielectric properties of A-site substitution by Nd3+ in (Pb0.5Ca0.5)(Fe0.5Nb0.5)O3 system were investigated.
Microwave dielectric properties of [(Pb0.5Ca0.5)1-xNdx](Fe0.5Nb0.5)O3 (PCNFN) were improved because the solid solution of small amount of surplus Nd3+
with (Pb,Ca)2+ could eliminate oxygen vacancies. A single perovskite phase was formed when x=0.02. Surplus Nd3+ resulted in the formation of secondary
phase (pyrochlore), which can deteriorate to the microwave dielectric properties of PCNFN ceramics. The decreasing of dielectric properties with x content was
mainly caused by the formation of pyrochlore. Dielectric constant was above 100 and quality factor Qf values were 5385～5797GHz as x=0.02～0.05. Temperature
coefficient of resonant frequency (TCF) was changed from positive to negative with the increase of x content.

Key words: （Pb, Ca, Nd）（Fe, Nb）O3, microwave dielectric ceramics, perovskite

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