Structural characteristics of Sr1−xLaxTi3+δ as a function of oxygen partial pressure at 1400 °C
Authors:
- 15 February 1989
- journal article
- conference paper
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 65 (4) , 1492-1498
Abstract
The structural characteristics of Sr1−x Lax TiO3+δ (0≤x≤0.4) at 1400 °C have been investigated as a function of ambient oxygen partial pressure. A modified Rietveld pattern‐fitting structure‐refinement program [H. M. Rietveld, J. Appl. Crystallogr. 2, 65 (1969)] was used to determine the nature of the distortions of the fundamental perovskite unit cell, the degree of lattice perfection, and the cation vacancy concentrations. Specimens equilibrated in forming gas displayed a linear relation between x, the lattice parameters, and the degree of lattice perfection while those samples annealed in air and oxygen deviated significantly from linearity. A monoclinic distortion of the perovskite structure was seen in the samples at low oxygen partial pressures while a second phase or layer type of distortion appeared in samples with x>0.2 under oxidizing conditions.Keywords
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