AC impedance analysis of LaLiMo2O8 electroceramics |
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| Institution: | 1. School of Materials and Energy, Guangdong University of Technology, Guangzhou, Guangdong 510006, China;2. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;1. Unité de Recherche de Physique des Matériaux Isolants et Semi Isolants, Faculté des Sciences de Sfax, Université du Sfax, Route de Soukra Km 3.5, BP 1171, 3000, Sfax, Tunisia;2. Laboratoire Physico-Chimique de L''Etat Solide, Université du Sfax, Faculté des Sciences de Sfax, Route de Soukra Km 3.5, BP 802, 3018 Sfax, Tunisia;3. Laboratoire de Physique des Matériaux et des Nanomatériaux Appliquée a l''Environnement, Faculté des Sciences de Gabes, Cité Erriadh, 6079 Gabés, Tunisia;1. Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Université de Sfax, B. P 1171, 3000, Sfax, Tunisia;2. Laboratoire de Physique des Matériaux et des Nanomatériaux appliquée à l’Environnement, Faculté des Sciences de Gabès, Université de Gabès, cité Erriadh, 6079, Gabès, Tunisia;1. Laboratoire de Chimie Appliquée et Génie Chimique de l’Université Mouloud Mammeri de Tizi-Ouzou, Algeria;2. Laboratoire des Matériaux Céramiques et Procédés Associés – Université de Valenciennes et du Hainaut-Cambrésis, Z.I. du Champ de l’Abbesse, 59600 Maubeuge, France;3. Univ. Lille Nord de France, F-59000 Lille, France;1. Engineering Physics and Mathematics Department, Faculty of Engineering, Tanta University, Tanta 31521, Egypt;2. Physics Department, Faculty of Science, Tanta University, Tanta, Egypt |
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| Abstract: | Complex impedance analysis of a new rare earth-based ceramic oxide, LaLiMo2O8, 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. |
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