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通过朗道二级相交理论中热力学势最小值的计算,给出了Oh1至Oh10空间群r点二级结构相变的方向,并讨论了“最大子群”条件。By calculating the minimum of thermodynamic potential in Landau's theory of second order phase transition, the direction of second order structural phase transition at Γ point of Ohn space groups are obtained. "Maximal subgroup" condition is discussed.
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