Structure and dielectric properties of Nd substituted Bi1.5MgNb1.5O7 ceramics

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• 作者：Baoshuai Huang (1)
  Yunfei Liu (1)
  Yinong Lu (1)
  Hong Gao (1)
  Hu Chen (1)
  
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：24
• 期：8
• 页码：2785-2789
• 全文大小：795KB
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• 作者单位：Baoshuai Huang (1)
  Yunfei Liu (1)
  Yinong Lu (1)
  Hong Gao (1)
  Hu Chen (1)
  
  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, 210009, People’s Republic of China
  

文摘

New pyrochlore ceramics Bi(1.5?em class="a-plus-plus">x)Nd x MgNb1.5O7 with x?=?0-.6 were synthesized by doping Nd into the A site in the Bi1.5MgNb1.5O7 pyrochlore. The Nd substituted Bi1.5MgNb1.5O7 ceramics were prepared utilizing solid-state reaction and investigated by X-ray diffraction, scanning electron microscope and dielectric measurements. The crystal structure was characterized as single cubic pyrochlore phase for x?≤?.5 while the second phase appeared at x?=?0.6. With increasing Nd content from 0 to 0.5, the lattice parameters decreased slightly and the average grain size pronouncedly reduced from ~7.5 to ~5.0?μm. The Nd incorporation resulted in attractive enhancement of the dielectric properties including the temperature coefficient of dielectric constant that was remarkably optimized with the lowest value of ?6?ppm/°C at x?=?0.5. A good combination of low dielectric loss, superior temperature coefficient and high dielectric permittivity can be achieved for the composition of x?=?0.5, which seems to be very appealing for the practical use in high-frequency multilayer ceramic capacitors.