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 Research articleInfluence of sintering temperature on resistivity, magnetoresistance and thermopower of La0.67Ca0.33MnO3G Venkataiah1,2 1Department of Physics, Osmania University, Hyderabad 500 007, India 2Department of Physics, National Cheng Kung University, Tainan 701, Taiwan, Republic of China ROC
PMC Physics B 2008, 1:7doi:10.1186/1754-0429-1-7
AbstractA systematic investigation of La0.67Ca0.33MnO3 manganites has been undertaken, mainly to understand the influence of varying crystallite size (nano meter range) on electrical resistivity, magnetic susceptibility and thermoelectric power. The materials were prepared by the sol-gel method of sintering at four different temperatures between 800–1100°C. The samples were characterized by X-ray diffraction and data were analyzed using Rietveld refinement. The metal-insulator transition temperatures (TP) are found to increase with increasing sintering temperatures, while the magnetic transition temperatures (TC) decrease. The electrical resistivity and thermoelectric power data at low temperatures (T < TP) have been analyzed by considering various scattering phenomena, while the high temperature (T > TP) data were analyzed with Mott's small polaron hopping conduction mechanisms. PACS Codes: 73.50.Lw, 75.47.Gk, 75.47.Lx |
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