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问题12(1分)第三章 第 11 题晶体由N个原子组成，如图3-2所示.当原子离开正常位置而占据图中的格点间隙位置时，晶体中就出现空位和填隙原子.晶体的这种缺陷称为弗仑克尔(Frenkel)缺陷.假设正常位置和填隙位置数均为N，在晶体中形成n个空位和填隙原子，（1）求出熵S； （2）设原子在填隙位置和正常位置的能量差为u，求当n<A.
(1)
B.
(1)
C.
(1)
D.
(1)
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