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The effect of B 2 O 3 on the solubility of (YSmLuCa) 3 (FeGe) 5 O 12 garnet in PbO‐B 2 O 3 flux
Author(s) -
Nitsch K.,
Bok J.,
Kučera M.,
Petrík S.,
Pištora J.,
Višňovský Š.
Publication year - 1984
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.2170191110
Subject(s) - solubility , solubility equilibrium , saturation (graph theory) , arrhenius equation , analytical chemistry (journal) , mineralogy , materials science , crystallography , chemistry , thermodynamics , physics , activation energy , organic chemistry , mathematics , combinatorics
The paper deals with the solubility of (YSmLuCa) 3 (FeGe) 5 O 12 garnet in PbO—B 2 O 3 flux. An anionic model explaining the effect of B 2 O 3 on the solubility of rare earth garnet is suggested. This model is based on the assumption that PbO in the melted mixture of PbO, B 2 O 3 , Fe 2 O 3 , R 2 O 3 , CaO, GeO 2 dissociates into Pb 2+ and O 2− . The oxygen anions react with the other oxides under the formation of BO 3 3− , FeO 3 3− , RO 6 9− , CaO 2 2− and GeO 3 2− anions, until the equilibrium is established. The garnet is dissociated into the anions mentioned above. The validity of the model is verified by an agreement of the experimentally determined saturation temperatures of the melts for LPE of garnet layers with the Arrhenius‐type expression of the solubility product of garnetwhere x i denotes the equilibrium concentrations of the anions in the melt and x ° is the Ge content of the garnet film.