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Crystal growth of pure substances: Phase-field simulations in comparison with analytical and experimental results

Nestler, Britta; Danilov, D.; Galenko, P.

Abstract:
Quantitative analytical electron microscopy study of dopant
distribution in the rnicrostructure of selected Nd-alpha-sialon samples
revealed the presence of relatively large amounts of glassy phase at
quadruple pockets, which exhibited a common composition similar to a
melilite solution. Al segregants were depleted from adjacent grain
boundaries to satisfy the "stoichiometry" of such glass. Existence of
this glass results in significant deviation of the Nd-alpha-sialon
composition from the expected values, which shifts the
alpha-beta-sialon phase boundary. Only extra Nd2O3 additives enable a
monolithic alpha-sialon microstructure. The absence of similar glass in
Yb-alpha-sialon materials keeps the phase relations from such
deviations.


Zugehörige Institution(en) am KIT Institut für Zuverlässigkeit von Bauteilen und Systemen (IZBS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2005
Sprache Englisch
Identifikator ISSN: 0021-9991
KITopen ID: 1000018704
Erschienen in Journal of Computational Physics
Band 207
Seiten 221-239
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