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Influence of CeO2 on microstructure and microwave dielectric properties of Na1/2Sm1/2TiO3 ceramics

  • Zi-xuan Fang
  • Bin Tang
  • Feng Si
  • Shu-ren Zhang
Article

Abstract

Crystal structures and microwave dielectric properties of wt% CeO2-added Na1/2Sm1/2TiO3 (NST) ceramics were investigated systematically (x = 0.0, 0.3, 0.6, 0.9 and 1.2). Samples with CeO2 content ≤1.2 wt% were crystallized as single phase of orthorhombic perovskite structures. When Ce4+ initially entered into the A-site of perovskite structure, uniform grain growth was observed and the dielectric constant increased, but then as Ce4+ began to enter into the B-site of the perovskite structure, abnormal grains appeared and the ε r value reduced. The Q × f value was firstly enhanced to its maxim value of 9640 GHz due to the improvement of density and elimination of pores as Ce4+ content was in the range of 0.0–0.6 wt%, then sharply decreased. The temperature coefficient of resonant frequency (τ f ) slightly decreased from 199.7 to 185.1 ppm/°C. Typically, specimens sintered in air at 1425 °C for 2 h exhibited excellent microwave dielectric properties of ε r = 103.01, Q × f = 9640 GHz and τ f  = 192.8 ppm/°C. The relationships between microwave properties and crystal structures were also discussed in this paper.

Keywords

Dielectric Constant Perovskite CeO2 Resonant Frequency Apparent Density 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work is supported by National Natural Science Funds of China (Grant No. 51402039).

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Zi-xuan Fang
    • 1
  • Bin Tang
    • 1
  • Feng Si
    • 1
  • Shu-ren Zhang
    • 1
  1. 1.State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengduChina

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