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Phase Relations and Lattice Constants in the MgO-Al2O3-Ga2O3 System at 1550°C

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Phase relations and lattice constants in the MgO–Al2O3–Ga2O3 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% Ga2O3–67 mol% Al2O3 for a homogeneous spinel are possible. In the bordering phase diagrams of MgO–Al2O3 and MgO–Ga2O3, the composition of the spinel is as high as 63 mol% Al2O3 or Ga2O3, respectively. The contributions of all simple ionic exchange reactions on the lattice constant of the spinel have been deduced from X-ray diffractometry data.
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Document Type: Research Article

Affiliations: Mineralogisch-Petrologisches Institute. University of Göttingen, 37077 Göttingen. Germany

Publication date: 01 January 1997

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