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AC impedance analysis of LaLiMo2O8 electroceramics

✍ Scribed by Sanjaya Brahma; R.N.P. Choudhary; Awalendra K. Thakur


Book ID
103883488
Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
620 KB
Volume
355
Category
Article
ISSN
0921-4526

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✦ Synopsis


Complex impedance analysis of a new rare earth-based ceramic oxide, LaLiMo 2 O 8 , prepared by a standard solidstate 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.


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