Composition control of low-volatility solids through chemical vapor transport reactions. I. Theory of selective chemical vapor transportстатья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Composition control of low-volatility solids through chemical vapor transport reactions. i. theory of selective chemical vapor transport / A. Y. Zavrazhnov, I. D. Zartsyn, A. V. Naumov et al. // Journal of Phase Equilibria and Diffusion. — 2007. — Vol. 28, no. 6. — P. 510–516. A new method is proposed for controlling the composition (nonstoichiometry) of low-volatility inorganic compounds. It is based on the introduction/elimination of one of the components into/from the low-volatility compound using reversible selective chemical vapor transport. The conditions for composition control through selective chemical vapor transport are deduced from the principles of nonequilibrium thermodynamics, in which the direction of the mass-transfer of a component is unambiguously defined by the temperature and composition of the source (T-1, x(1)) and of the sample (T-2, x(2)). This approach can be employed to control the sample composition in a closed vapor-transport system, in which composition x(2) of the sample is defined by the fixed values of x(1), T-1, and T-2, provided the steady-state (no mass-transfer) condition is achieved. The effect of steady-state conditions on sample composition is visualized using T-2-T-1-x(2) diagram for the following system: sample (Ga-S phases)-vapor-charge (pure Ga). [ DOI ]

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