ELASTIC COEFFICIENTS IN TLGA(S1-XSEX)2 AND TLINXGA1-XS2 LAYER MIXED-CRYSTALS BY BRILLOUIN-SCATTERING


GASANLY N. , AKINOGLU B., ELLIALTIOGLU S., LAIHO R., BAKHYSHOV A.

PHYSICA B, vol.192, no.4, pp.371-377, 1993 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 192 Issue: 4
  • Publication Date: 1993
  • Doi Number: 10.1016/0921-4526(93)90013-v
  • Title of Journal : PHYSICA B
  • Page Numbers: pp.371-377

Abstract

The compositional variation of the elastic coefficients C-11 and C33 for TlGa(S1-xSex) and TlInxGa1-xS2 layer mixed crystals are discussed using Brillouin scattering measurements. Clear anomalies are observed for the longitudinal phonons propagating parallel to the (00 1) plane (elastic coefficient C-11) at x(c) congruent-to 0.8 and x(c) congruent-to 0.3 in TlInxGa1-xS2 and TlGa(S1-xSex)2, respectively. These anomalies are explained by the formation of infinite clusters. A considerable difference in the rate of change of the elastic coefficient C33 with the composition for the mixed crystals TlGa(S1-xSex)2 and TlInxGa1-xS2 is observed. The temperature variation of C33 for a TlIn0.95Ga0.05S2 mixed crystals is also given and the results are discussed.