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Browsing by Author "鄭招仁"

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    K2SnCl6單晶之低溫結構相變的電子順磁共振研究
    (1997) 鄭招仁
      本論文是利用電子順磁共振的方法研究含雜質Cr3+之K2SnCl6晶體在室溫及低溫的結構相變.   室溫時,K2SnCl6屬於立方晶系,空間群Fm3m,勞厄群T,晶格常數a=9.9877A以[111] 為其對稱軸,其spin-Hamiltonian參數為 g=1.9820 D/b=1827(G) E/b=0 (有軸對稱)   降溫時發現其相變溫度TC1在266K~267K之間,TC2約在260K附近.   在溫度為200時,分析其E.P.R譜圖,相變後形成雙晶,其晶格結構屬於斜方晶系(orthorhombic)勞厄群D2,其spin-Hamiltonian參數為 g=1.990 D/b=2000(G) E/b=200(G)

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