Ontology type: schema:ScholarlyArticle
2004-01
AUTHORSA. Yu. Zavrazhnov, I. D. Zartsyn, D. N. Turchen, A. V. Naumov, V. P. Zlomanov
ABSTRACTA 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... »
PAGESs101-s127
http://scigraph.springernature.com/pub.10.1007/pl00021874
DOIhttp://dx.doi.org/10.1007/pl00021874
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