Surface oxide chemistry of Hg0.8Cd0.2Te

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Abstract
The surface oxide chemistry of Hg0.8Cd0.2Te in aqueous solutions with the pH ranging from 1–11 has been determined from the electrophoresis zeta potential. A four parameter acid dissociation model was developed to fit the experimental data. The dissociation of tellurous acid, which was formed by a surface oxide of TeO2 combining with water, was found to dominate the surface oxide chemistry for pH between 1 and 9. The point of zero zeta potential (PZZP) occurred at pH = 1.8. The tellurous acid dissociated in a two-step pattern with surface charge densities of approximately −2×1012 electrons/cm2 from pH of 4 to 6.5 and −4×1012 electrons/cm2 from pH of 9 to 9.5. As the pH was increased beyond 10, oxidized Cd dominated the surface oxide chemistry.

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