Isotopically pure ZnSe crystals grown from the vapor

For the study of isotope effects in ZnSe, Zn-64 and Zn-68 isotopes have bee n combined with Se-76 and Se-80 isotopes. Synthesis, purification and cryst al growth were carried out via the vapor phase in the same sealed ampoule. The [1 1 1] directed growth was favored by repeated formation of twins. Rod -shaped crystals up to 8 mm in length were obtained from small quantities o f source materials. The physical vapor transport in an argon atmosphere wit h a Zn reservoir has been studied quantitatively. (C) 1999 Elsevier Science B.V. All rights reserved.