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无机材料学报

无机材料学报

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NdAlO3掺杂对Ba4.2Nd9.2Ti18O54陶瓷微波介电性能的影响

吕文中, 朱建华, Eric Rop Kipkoech   

  1. 华中科技大学电子科学与技术系, 武汉 430074
  • 收稿日期:2005-01-24 修回日期:2005-03-14 出版日期:2006-01-20 网络出版日期:2006-01-20

Effects of NdAlO3 Additives on the Properties of Ba4.2Nd9.2Ti18O54 Ceramics

Lü Wen-Zhong, ZHU Jian-Hua, Eric Rop Kipkoech   

  1. Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2005-01-24 Revised:2005-03-14 Published:2006-01-20 Online:2006-01-20

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摘要： 研究了NdAlO3掺杂对Ba4.2Nd9.2Ti18O54(简称BNT)陶瓷材料微观结构及其微波介电性能的影响. 采用XRD和场发射扫描电子显微镜分析了掺NdAlO3后的BNT陶瓷材料的微观结构. 结果表明, 掺入的NdAlO3与Ba4.2Nd9.2Ti18O54形成了固溶体. 随着NdAlO3掺入量的增加, 材料的介电常数和谐振频率温度系数逐渐减小, Q×f值先增大后减小. 当NdAlO3的掺入量为10wt%时, 材料的Q×f值达到最大(11400GHz), 谐振频率温度系数接近为零(-0.7ppm/℃),此时材料的相对介电常数为66.29(3.5GHz).

关键词: 微波介电性能, Ba4.2Nd9.2Ti18O54, NdAlO3, 钨青铜矿结构

Abstract: The effects of NdAlO3 additives on the microstructure and the dielectric properties of Ba4.2Nd9.2Ti18O 54 (BNT) materials were investigated.
The microstructure of BNT doped with NdAlO3 was analyzed by X-ray diffraction and FESEM. The results show that the solid solutions are
formed between Ba4.2Nd9.2Ti18O54 and the NdAlO3 additives. The relative permittivity and the TCf values show a linear
decrease with the increase of NdAlO3 additive. The Q values exhibit a non-linear behaviour and reach maximiun (11400GHz) for the NdAlO3
additive at approximately 10wt%, while the relative permittivity and the TCf values are 66.29 (3.5GHz) and -0.7ppm/℃, respectively.

Key words: microwave dielectric properties, Ba4.2Nd9.2Ti18O54, NdAlO3, tungsten-bronzes structure

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