Direct observation of the 3C-2H transformation in ZnSe by high-temperature x-ray diffraction

Abstract

The crystal structures of ZnSe at high temperatures up to 1440°C are directly observed by a high-temperature oscillation technique. ZnSe samples cut from melt-grown crystals with a zincblende structure are sealed in fused quartz ampoules to avoid sublimation. The ampoule is fixed in a graphite heater. An X-ray diffraction study of the structural transformation in ZnSe is performed through the graphite heater. The X-ray patterns by the 12° oscillation method with Cu K α show that the cubic zincblende (3C) structure of ZnSe transforms to the hexagonal wurtzite (2H) structure above a reported transition temperature of 1425°C and that the 2H to 3C transformation in ZnSe occurs by cooling.