Abstract
Solution hardening due to the incorporation of Zn in CdTe is studied theoretically by means of a model which starts from the differences between the Cd-Te and Zn-Te bond lengths. The critical resolved shear stress (CRSS) for plastic deformation is calculated for the entire composition range. Plastic deformation experiments performed at room temperature on CdTe, Zn0.04Cd0.96Te and Mn0.1Cd0.9Te crystals confirm that the Zn alloy is harder (by a factor of four) while the Mn alloy does not show any hardening effect. These results are complemented by microhardness measurements which give CRSS values in ZnxCd1-xTe in qualitative agreement with the model. Finally the superior crystalline quality of Zn0.04Cd0.96Te is demonstrated by a lower dislocation density (5x104 cm-2) and a narrower rocking curve width (25 arc sec).
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