Sequential Evolution of Different Phases in Metastable Gd2–xCexZr2–xAlxO7 (0.0 ≤ x ≤ 2.0) System: Crucial Role of Reaction Conditions
作者： Rakesh Shukla , Farheen N Sayed , Suhas Phapale , Ratikant Mishra , Avesh K Tyagi
DOI: 10.1021/IC401041E
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摘要: The Gd2–xCexZr2–xAlxO7 (0.0 ≤ x 2.0) series was synthesized by the gel combustion method. This system exhibited presence of a fluorite-type phase, along with narrow biphasic region, depending upon Ce/Gd content in sample. Thermal stability these new compounds under oxidizing and reducing conditions has been investigated. products obtained on decomposition were found to be entirely different. It observed that air solid solutions composition undergo phase separation into perovskite GdAlO3 Gd–Ce–Zr–O or Ce–Zr–Al–O extent Ce Al substitution. On other hand, samples heating show CeAlO3 defect-fluorite Gd2Zr2O7. metastability for typical Gd1.2Ce0.8Zr1.2Al0.8O7 (nano), Gd1.2Ce0.8Zr1.2Al0.8O6.6 (heated ...
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