Composition Control of Low-Volatile Solids Through Chemical Vapor Transport Reactions I. Theory of Non-Destructive Vapor Transport

Published

October 12, 2021

Author(s)

A Y. Zavrazhnov, I D. Zartsyn, A V. Naumov, V P. Ziomanov, Albert Davydov

Abstract

A new method is proposed for controlling the composition (nonstoichiometry) of low-volatile inorganic compounds. It is based on the introduction/elimination of one of the components into/from the low-volatile compound using reversible selective chemical vapor transport. The conditions for composition control through non-destructive vapor transport (NVT) are deduced from the principles of non-equilibrium thermodynamics, in which the direction of component's mass transfer is unambiguously defined by the temperature (T_subscript 1, T _subscript 2) and composition (alpha _subscript 1, alpha_subscript 2) of the source and of the sample, respectively. This approach can be employed to control sample composition in a closed vapor-transport system, in which composition alpha_subscript 2 of the sample is defined by the fixed values of alpha -subscript 1, T_subscript 1 and T_subscript 2 providing a steady-state (no mass-transfer) is achieved. The effect of stead-state conditions on sample composition is visualized usisng T_subscript 2-T_subscript 1-alpha_subscript 2-diagram for the system: sample (Ga-S phased)-vapor-charge (pure Ga).

Citation

Journal of Phase Equilibria and Diffusion

Pub Type

Journals

Keywords

phase diagrams, semiconductors, vapor transport

Citation

Zavrazhnov, A. , Zartsyn, I. , Naumov, A. , Ziomanov, V. and Davydov, A. (2021), Composition Control of Low-Volatile Solids Through Chemical Vapor Transport Reactions I. Theory of Non-Destructive Vapor Transport, Journal of Phase Equilibria and Diffusion (Accessed July 17, 2024)