AC impedance analysis of LaLiMo 2O 8 electroceramics

Sanjaya Brahma, R. N.P. Choudhary, Awalendra K. Thakur

研究成果: Article同行評審

169 引文 斯高帕斯(Scopus)

摘要

Complex impedance analysis of a new rare earth-based ceramic oxide, LaLiMo 2O 8, prepared by a standard solid-state reaction technique has been carried out. Material formation under the reported conditions has been confirmed by X- ray diffraction studies. A preliminary structural analysis indicates the crystal structure to be orthorhombic. Electrical properties of the material sample have been studied using AC impedance spectroscopy technique. Impedance spectrum results indicate that the electrical properties of the material are strongly dependent on temperature and it bears a good correlation with the sample microstructure (i.e. the presence of bulk, grain boundary, etc.) in different temperature ranges. Evidences of temperature-dependent electrical relaxation phenomena in the material have also been observed. The bulk resistance, evaluated from complex impedance spectrum has been observed to decrease with rise in temperature showing a typical negative temperature coefficient of resistance (NTCR)-type behavior like that of semiconductors. The DC conductivity shows typical Arrhenius behavior when observed as a function of temperature. The AC conductivity spectrum has provided typical signature of an ionically conducting system and is found to obey Jonscher's universal power law. Modulus analysis has indicated the possibility of hopping mechanism for electrical transport processes in the system with non-exponential-type conductivity relaxation.

原文English
頁(從 - 到)188-201
頁數14
期刊Physica B: Condensed Matter
355
發行號1-4
DOIs
出版狀態Published - 2005 1月 31

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 電氣與電子工程

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