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The importance of the oxygen ion concentration for oxidic high‐temperature solvents
Author(s) -
Sinn E.,
Linzen D.,
Fischer K.
Publication year - 1985
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.2170200721
Subject(s) - oxygen , chemistry , oxide , solvent , ion , inorganic chemistry , base (topology) , analytical chemistry (journal) , organic chemistry , mathematical analysis , mathematics
Using e.m.f. measurements we determined relative oxygen ion concentrations of the systems PbO—PbF 2 —B 2 O 3 , PbO—MoO 3 —B 2 O 3 , PbO—Bi 2 O 3 —V 2 O 5 , 3 PbO · MoO 3 —Fe 2 O 3 , and 3 PbO · MoO 3 —Ga 2 O 3 . Furthermore the alteration of the relative oxygen ion concentration of pure PbO was observed after stepwise addition of the solvent components PbF 2 , B 2 O 3 and of the garnet forming oxides Fe 2 O 3 and Y 2 O 3 giving complete high temperature solutions for the Y 3 Fe 5 O 12 preparation. Applying the Lux' acid‐base concept the behaviour of these oxide mixtures is discussed. Combinations which contain weak bases and weak acids allow the adjustment of a desired oxygen ion concentration that is little changed by added oxides for crystal growth. These combinations show favourable properties as solvents for oxidic substances with complicated compositions, e.g. perovskites, garnets, ferrites.