Vol. 42, No. 9 ABSTRACTS OF ARTICLES TO BE PUBLISHED IN THE J. PHYS. CHEM. SOLIDS V

14. ANISTROPY AND TWINNING IN CUBIC ZINC SULFIDE CRYSTALS

Wayne L. Garrett, U.S. Army Armament Research and Development Command, Dover, N.J. 07801, U.S.A. Gerhard Ruban, Institut fti Kristallographie, Freie Universit5t Berlin, 1000 Berlin 33, Germany; and Ferd Williams, Physics Department, University of Delaware, Newark, Del. 19711, U.S.A.

The structure of zinc sulfide single crystals grown from the vapor has been studied by a unique com-

bination of X-ray crystallography and thermal con- ductivity measurements. Weissenberg patterns reveal the face centered cubic structure with rotational twirming in the [ 11 l] direction, which could be ascribed to two overlapping lattices. These could be explained by normal stacking faults or by inverted twins. A strong anistropy in thermal conductivity was measured and interpreted as favoring the inverted twin model.

Received 22 September 1980 Revised 28 October 1981