Chemical vapor transport as a means of controlling the composition of condensed phases View Full Text


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Article Info

DATE

2004-01

AUTHORS

A. Yu. Zavrazhnov, I. D. Zartsyn, D. N. Turchen, A. V. Naumov, V. P. Zlomanov

ABSTRACT

A new method is proposed for controlling the composition (nonstoichiometry) of low-volatile inorganic compounds. The basic principle of the method is the introduction (or removal) of one of the components into the low-volatile compound using reversible selective chemical vapor transport (CVT). Theoretical analysis is used to identify the process parameters determining the direction of mass transport: source temperature T1, source composition x1, and sample temperature T2. Using nonequilibrium thermodynamics concepts, steadystate conditions are found under which mass transport ceases. A new type of phase diagram, x2–T1–T2, is proposed, which describes the state of CVT systems under steady-state conditions without mass transport. The CVT process is used to prepare GaSe crystals with different deviations from stoichiometry. The crystals are characterized using x-ray diffraction and cathodoluminescence spectroscopy. The stability regions of two GaSe polytypes in the T-x phase diagram are located. CVT is used to control the compositions of phases in the In–S system. The advantages of the CVT method are analyzed with application to control over the composition of inorganic compounds. More... »

PAGES

s101-s127

References to SciGraph publications

  • 2001-08-01. Manometric method for the study of P-T-X diagrams in JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
  • 1977. III–VI Compounds in PREPARATION AND CRYSTAL GROWTH OF MATERIALS WITH LAYERED STRUCTURES
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    http://scigraph.springernature.com/pub.10.1007/pl00021874

    DOI

    http://dx.doi.org/10.1007/pl00021874

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