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Published online by Cambridge University Press: 15 July 2004
The long-term diffusion processes of defects in HgxCd$_{1-x}$Te mixed crystals were investigated. Measurements of reflectivity and surface characterisation by means of scanning electron microscopy (SEM) were performed for samples with x = 0.4 and x = 0.62. The experiments were repeated after wet chemical etching. Optical results were compared with the reflectivity spectra obtained 20 years ago using the same samples of investigated material. We discuss the observed large changes in the optical spectra on the basis of comparative analysis and SEM results.