Growth and characterisation of bulk Zn1-xBexSe, Zn1-x-yMgxBeySe and Zn1-xBexTe crystals

In this paper we report an extension of our earlier results for Zn1-xMgxSe and low-Be Zn1-xBexSe to related ternary (high-Be Zn1-xBexSe and Zn1-xBexTe ) and quaternary (Zn1-x-yMgxBeySe) alloys. ii dependence of defect structur e on crystal composition, growth and thermal treatment is observed. X-ray d iffraction was used for phase analysis and determination of lattice paramet ers. High-resolution transmission electron microscopy was used to compare k ind and density of defect. Among the studied crystals, the lowest defect de nsity was found for Zn1-x-yMgxBeySe. (C) 2000 Elsevier Science B.V. All rig hts reserved.