Abstract
The initial stages of the formation of CdAs2-ZnAs2 solid solutions are analyzed in terms of crystal-chemical energetics. Given that the bond enthalpies decrease in the order H(Zn-As) < H(Cd-As) < H(As-As), it is concluded that, most likely, CdAs2-based solid solutions are substitutional and ZnAs2-based solid solutions are interstitial, and that the thermochemical stability of the substitutional solid solutions is higher than that of CdAs2 . The conclusions drawn from crystal-chemical analysis correlate with the reported x-ray diffraction, chemical analysis, resistivity, and Hall data for the solid solutions.
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