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    题名: Structural and Magnetic Properties of (R0.5A0.5)NiO3 Perovskites (R = Gd, Yb and A = Ce, Th)
    作者: Chen, J. W.;Liu, H. M.;高惠春;Kao, H. C. I.;Sheu, H. S.;Lee, J. F.;Ling, D. C.;彭維鋒;Pong, Way-faung;Horng , L.
    贡献者: 淡江大學物理學系;淡江大學化學學系
    日期: 2007-07-20
    上传时间: 2009-12-31 10:13:54 (UTC+8)
    出版者: World Scientific Publishing
    摘要: Four perovskite compounds with nominal compositions of (Gd0.5Th0.5)NiO3, (Gd0.5Ce0.5)NiO3, (Yb0.5Th0.5)NiO3 and (Yb0.5Ce0.5)NiO3 were prepared by a polymeric citrate precursor method. They were either slow-cooled in the furnace or quenched to room temperature. All of them have monoclinic symmetry. Quenched samples have a slightly bigger unit cell volume and longer Ni-O bond length, and a smaller grain size than that of the furnace-cooled compounds. All samples are paramagnetic insulators in the range of 2 K to 300 K. The Th containing compounds have larger tolerance factor and Ni(1)–O(1)–Ni(2) bond angle than that of the Ce containing compounds. No mixed valence of Ce, Th and Ni is observed in these samples.
    關聯: International Journal of Modern Physics B 21(18-19), pp.3443-3447
    DOI: 10.1142/S0217979207044718
    显示于类别:[物理學系暨研究所] 期刊論文
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