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    題名: Structural, electrical transport and x-ray absorption spectroscopy studies of LaFe1−xNixO3(x≦0.6…)
    作者: Kumar, Ravi;Choudhary, R. J.;Khan, M. Wasi;Srivastava, J. P.;Bao, C. W.;Tsai, H. M.;Chiou, J. W.;Asokan, K.;彭維鋒;Pong, W. F.
    貢獻者: 淡江大學物理學系
    日期: 2005-05-01
    上傳時間: 2009-12-31 10:22:20 (UTC+8)
    出版者: College Park: American Institute of Physics (AIP)
    摘要: Electronic structures of LaFe1−xNixO3 sxø0.6d have been studied by x-ray absorption near edge structure spectra of O K, Fe L2,3 and La M4,5 edges. Upon substitution of Ni at Fe site in LaFeO3, the O K-edge spectra show a feature about 2.0 eV lower than that of LaFeO3. This feature is growing as the concentration of Ni is increasing. This is consistent with our resistivity data which show that the resistivity decreases very fast with Ni substitution from GV cm for LaFeO3 to a few mV cm for the sample with 60% Ni substitution. The resistivity data have been fitted with a variable-range hopping model and it is found that the gap parameter reduces from 2 eV to 2.1 meV with the Ni substitution. This gap parameter decreases very systematically with the increase in Ni concentration. The structural analysis of these samples shows that they have single-phase orthorhombic structure with space-group Pnma in the studied range s0øxø0.6d. The study of Fe L2,3-edge structures confirm the trivalent state of Fe. The observed features have been explained on the basis of charge-carrier doping in LaFeO3. The disorder-induced localization is found to effectively control the resistivity behavior.
    關聯: Journal of Applied Physics 97(9), pp.093526
    DOI: 10.1063/1.1884754
    顯示於類別:[物理學系暨研究所] 期刊論文


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