晶体线膨胀系数的讨论  

Discussion on Linear Expansion Coefficient of Crystals

作　　者：杜学东[1] 张锦红[2] 李隆庚[3] 

机构地区：[1]唐山师范学院,河北唐山063000 [2]唐山师范学院物理系,河北唐山063000 [3]唐山师范学院信息技术中心,河北唐山063000

出　　处：《唐山师范学院学报》2007年第2期15-16,共2页Journal of Tangshan Normal University

摘　　要：在非简谐效应下,把势能U(r0+δ)相对于平衡位置r0用泰勒级数展开,保留到δ3项与保留到δ4项时,晶体的线膨胀系数与温度的关系是不同的。以Zn,Cd,Co几种具有六角密积结构的金属晶体为例进行了讨论。Under the presence of the nonharmic effect, expanding the potential energy U（r0 ＋ δ） into Taylor series around the equilibrium to, it was found that the relation between linear expansion coefficient and temperature T with U（r0 ＋δ） of the terms up to theδ^3 is different from the one with U（r0 ＋ δ） of the terms up to thetδ^4. Several crystals with hop structure such as Zn, Cd, Co were taken for example to discuss the linear expansion coefficient, and the terms up to δ^4 must be included in the expansion formula of Taylor series at least.

关 键 词：非简谐效应 线膨胀系数 平均位移 

分 类 号：O522.2[理学—高压高温物理]