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Alternating-Current Transport Properties in Nd0.7Sr0.3MnO3 Ceramic with Secondary Phases

  • 1School of Mathematics and Physics, Hubei Polytechnic University, Huangshi 435003

  • 2Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062

  • 3Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg 620219

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  • Received Date: December 21, 2011
  • Revised Date: June 28, 2012
  • Published Date: June 30, 2012
    Abstract
  • Nd0.7Sr0.3MnO3 ceramics with secondary phases were prepared by ball-milling and post heat- treatment at 1623 K for 3, 7 and 13 h, respectively. The results from x-ray diffraction and energy dispersed spectroscopy show that some secondary phases are introduced and grow gradually with sintering time. These secondary phases have significant effects on the ac transport. For all the samples, the real part of impedance (Zr ) decreases with increasing frequency and the Zr peak moves to a higher temperature. Interestingly, for a given frequency the Zr peak decreases with sintering time. However, for samples B and C which were sintered for a longer time than sample A, an additional Zr peak appears at a higher temperature and gradually increases with sintering time. The reposition of trapped charges in phase/grain boundaries or secondary phases is supposed to be responsible for the unusual relaxation process.
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