Phase equilibria in the Ag4SSe-ZnTe system

The Ag4SSe-ZnTe phase diagram has been determined on the basis of X-ray dif fraction, differential thermal and metallographic analyses, as well as micr ohardness and density data. It has been divided into two subdiagrams of eut ectic type by an intermediate A-phase with most probable composition of 2Ag (4)SSe.ZnTe. The unit-cell parameters of the low-temperature alpha -2Ag(4)S Se . ZnTe modification have been determined (a=3.330 Angstrom, b=3.010 Angs trom, c=2.895 Angstrom, alpha =95.04 degrees, beta =107.83 degrees, gamma = 92.62 degrees). It has been supposed that in the ZnTe-rich part a second in termediate B-phase with a composition of Ag4SSe . 2ZnTe is formed, which is stable in the range of 320 divided by 500 degreesC. (C) 2001 Kluwer Academ ic Publishers.