Abstract
A quasi-closed-space method is proposed for accurately measuring the vapor pressure of a volatile component over solid compounds (solutions) and melts containing this component. The method is used to determine the equilibrium Hg vapor pressure pHg over the Hg0.8Cd0.2Te solid solution between 623 and 1268 K within the homogeneity range of HgCdTe and at its boundaries. The results indicate a jump in pHg and a break in its temperature dependence at about 920 K, corresponding to the onset of melting. Above 623 K, the total equilibrium excess of Te in solid homogeneous Hg0.8Cd0.2Te is close to the concentration of charged Hg vacancies, as determined by Hall effect measurements.
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