Selenium solubility in solid zinc selenide


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Abstract

Selenium solubility in solid s-ZnSe (F43m) under mono- and divariant equilibrium conditions has been determined by a direct physicochemical method in the temperature range 850–1173 K. The maximum concentration of excess selenium is 3.76 × 10–4 mol of excess Se per mole of ZnSe at 1173 K. The homogeneity range of the s-ZnSe phase has been shown to be characterized by retrograde solubility at its Se-rich phase boundary. A model has been proposed for defect formation in nonstoichiometric s-ZnSe at temperatures in the range 963–1173 K and pSe2 pressures in the range 1.05 × 10]4 to 5.01 × 105 Pa according to which the dissolution of excess Se is accompanied by the formation of electrically neutral associated vacancy defects in the zinc sublattice.

About the authors

Khanh Cong Tran

Mendeleev University of Chemical Technology

Email: aich@rctu.ru
Russian Federation, Miusskaya pl. 9, Moscow, 125047

E. N. Mozhevitina

Mendeleev University of Chemical Technology

Email: aich@rctu.ru
Russian Federation, Miusskaya pl. 9, Moscow, 125047

K. A. Potapova

Mendeleev University of Chemical Technology

Email: aich@rctu.ru
Russian Federation, Miusskaya pl. 9, Moscow, 125047

B. N. Levonovich

Mendeleev University of Chemical Technology

Email: aich@rctu.ru
Russian Federation, Miusskaya pl. 9, Moscow, 125047

I. Ch. Avetissov

Mendeleev University of Chemical Technology

Author for correspondence.
Email: aich@rctu.ru
Russian Federation, Miusskaya pl. 9, Moscow, 125047

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