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On the Formation of the Garnet Phase in Oxidic High‐Temperature Solutions
Author(s) -
Fischer K.,
Sinn E.
Publication year - 1986
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170210604
Subject(s) - solubility , ternary operation , phase (matter) , solvent , oxygen , ion , dissolution , rare earth , inorganic chemistry , phase diagram , materials science , chemistry , analytical chemistry (journal) , mineralogy , crystallography , organic chemistry , computer science , programming language
The paper informs on the formation of the garnets Y 3 Fe 5 O 12 , Y 3 Al 5 O 12 and Gd 3 Ga 5 O 12 as primary phase in the ternary solvent mixtures PbOPbF 2 B 2 O 3 and PbOMoO 3 B 2 O 3 . There are correlations with formerly measured oxygen ion concentrations (OIC) in the solvents:i each garnet grows in a special region of the OIC, the phase boundaries are parallel to the lines of constant OIC and ii the garnet solubility increases distinctly with decreasing OIC. This emphasizes the important role of the oxygen ions for the garnet formation.Solubility models are discussed taking into consideration both previous and present results. We conclude that the garnet formation is described best by a model reaction of the type\documentclass{article}\pagestyle{empty}\begin{document}$$3{\rm RE}^{{\rm 3 + }} \, + \,2{\rm M}^{{\rm 3 + }} \, + \,{\rm MO}_{\rm 4}^{{\rm 5 ‐ }} \to ({\rm RE}_{\rm 3} {\rm M}_{\rm 5} {\rm O}_{{\rm 12}})_{{\rm solid}}$$\end{document}RE rare earth elements, Y; M Al, Fe, Ga.