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    題名: Preparation and Magnetic Properties of (La1−xSr1+x)(Mn0.5Co0.5)O4
    作者: Lin, M. Y.;Wang, Y. F.;Ling, D. C.;Sheu, H. S.;Kao, H.C.I.
    貢獻者: 淡江大學化學學系
    關鍵詞: (La1−x Sr1+x )(Mn0.5Co0.5)O4;K2NiF4;Unit cell parameters;Paramagnetic;Ferromagnetic
    日期: 2010-07
    上傳時間: 2011-10-15 23:28:39 (UTC+8)
    出版者: New York: Springer New York LLC
    摘要: A series of single phase (La1−x Sr1+x ) (Mn0.5Co0.5)O4 (0≤x≤0.40) materials with a tetragonal K2NiF4 structure was prepared by a solid state reaction method at 1400 or 1450 °C with a short period of heating time. Powder X-ray diffraction (XRD) and the Rietveld refinement method were employed for the structural analysis. Unit cell a- and c-axes decrease with increasing amount of Sr substitution. A discrepancy between the zero-field-cooled and the field-cooled magnetization is observed in all samples investigated below a characteristic temperature, T *, which likely arises from the canted nature of spins or the random freezing of spins. It appears that T * decreases with increasing amount of Sr substitution, which is possibly due to the enhancement of chemical pressure induced by Sr and a corresponding increases of the valence of Mn and/or Co.
    關聯: Journal of Superconductivity and Novel Magnetism 23(5), pp.721-724
    DOI: 10.1007/s10948-010-0674-3
    顯示於類別:[化學學系暨研究所] 期刊論文


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