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Phase diagram study in the La2O3–Ga2O3–MgO–SrO system in air by Aleksandra Matraszek; Lorenz Singheiser; Dietmar Kobertz; Klaus Hilpert; Miroslaw Miller; O. Schulz; Manfred Martin is a Materials Science article available to read on EtoBox.

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Solid phase equilibria in the systems La 2 O 3 -Ga 2 O 3 -MgO and La 2 O 3 -Ga 2 O 3 -MgO -SrO near the solubility lobe of the (La,Sr)(Ga,Mg)O 3 À d perovskite phase were determined by XRD, SEM/EDX and EPMA of 30 samples which were annealed at 1173 and 1673 K and quenched subsequently. Equilibration of the samples at 1673 K was ensured by considering the diffusion coefficients of the cations which are the slowest moving species and the grain size. Solubility limits of Mg or Sr in the perovskite LaGaO 3 phase were determined at 1673 K as 14 mol% for Mg and < 2 mol% for Sr. The Mg 0.9 Ga 1.1 La 3 O 7 + d phase was identified in the La 2 O 3 -Ga 2 O 3 -MgO and La 2 O 3 -Ga 2 O 3 -MgO -SrO systems. MgGaLa 3 O 7 (s) was, in addition, identified in the La 2 O 3 -Ga 2 O 3 -MgO system. The solubility of Sr in the La 1 À x Sr x Ga 1 À y Mg y O 3 À (x + y)/2 perovskite phase increases up to about 20 mol% if Mg and Sr are added together. Phase composition of all fields adjacent to the doped perovskite phase in the quasi-ternary section LaGaO 3 -''LaMgO 2.5 '' -''SrGaO 2.5 '' resulted at 1673 K from experimental data and by comparison with the phase diagrams of the quasi-ternary systems La 2 O

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Author

Aleksandra Matraszek; Lorenz Singheiser; Dietmar Kobertz; Klaus Hilpert; Miroslaw Miller; O. Schulz; Manfred Martin

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0167-2738)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)