前言碲镉汞(MCT)可以看成是由Ⅱ—Ⅵ族化合物Cd Te和Hg Te按不同化学计量比组成的。其相图的固相线和液相线分离得很宽,也就是说从液态缓慢地结晶成固态时,Cd Te相对于Hg Te要产生严重的分凝,以致晶体不具有均匀的组分。为克服这一严重缺陷,使熔体通过强制冷却快速凝固,是一种广泛用来制备MCT晶体的工艺。用这种方 Preface HgCdTe can be considered as consisting of Group II-VI compounds Cd Te and Hg Te in different stoichiometric proportions. The phases of the solid phase and the liquid phase of the phase diagram are separated widely, that is to say, the Cd Te undergoes severe segregation with respect to HgTe when slowly crystallized from the liquid state to the solid state, so that the crystal does not have a homogeneous composition. To overcome this serious flaw, the melt is quickly solidified by forced cooling, which is a widely used process for preparing MCT crystals. Use this side