Open AccessTHE PRESSURE DEPENDENCE OF ENERGY GAP FOR MIXED CRYSTAL Hg0.3Cd0.7Te
Author(s) -
Shan Jiang,
Zhu Haorong,
Xuechu Shen,
J. Schilz
Publication year - 1989
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.38.1858
Subject(s) - band gap , materials science , absorption edge , pressure coefficient , thermodynamics , attenuation coefficient , range (aeronautics) , condensed matter physics , dielectric , optics , physics , optoelectronics , composite material
The absorption edge of p-Hg1-xCdxTe with x = 0.7 has been measured at different pressures in the range of 0-36kbar and room temperature. The experimental energy gap is basically in agreement with the result calculated by empirical formula The first order pressure coefficient of Hg1-xCdx Te obtained by a least square fitting to experimental data under different pressures is a = 8.7×10-11eV/Pa, which can be explained by chemical bond dielectric function theory. The second order pressure coefficient of energy gap has also been obtained experimentally as β= -6.3×l0-13eV/ kbar which is hard to understand theoretically. In addition, a structural phase transition has been found under 34-36kbar.