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Phase Relations and Lattice Constants in the MgO‐Al 2 O 3 ‐Ga 2 O 3 System at 1550°C
Author(s) -
Stalder Roland,
Nitsch KarlHeinz
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02821.x
Subject(s) - spinel , lattice constant , phase diagram , ionic radius , lattice (music) , ionic bonding , crystallography , homogeneous , phase (matter) , materials science , ion , analytical chemistry (journal) , chemistry , thermodynamics , diffraction , physics , organic chemistry , chromatography , acoustics , optics , metallurgy
Phase relations and lattice constants in the MgO–Al 2 O 3 –Ga 2 O 3 system at 1550°C have been determined experimentally. In a large part of this system, only a nonstoichiometric spinel is stable. Compositions as extreme as 12.5 mol% MgO–20.5 mol% Ga 2 O 3 –67 mol% Al 2 O 3 for a homogeneous spinel are possible. In the bordering phase diagrams of MgO–Al 2 O 3 and MgO–Ga 2 O 3 , the composition of the spinel is as high as 63 mol% Al 2 O 3 or Ga 2 O 3 , respectively. The contributions of all simple ionic exchange reactions on the lattice constant of the spinel have been deduced from X‐ray diffractometry data.