A-site ordering and its effect on tilting transition in perovskite La0.75Sr0.25FeO3-δ investigated by mechanical spectroscopy
作者： C. C. Chen , X. N. Ying
DOI: 10.1063/1.4983774
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摘要: La0.75Sr0.25FeO3-δ polycrystalline samples were prepared by the solid state reaction at different sintering temperatures. An octahedral tilting Pnma ↔ R 3 ¯ c transition in was detected mechanical spectroscopy, where a dip of reduced modulus observed and accompanied sharp internal friction peak. The softening is due to strain/order parameters coupling this improper ferroelastic transition. shifts toward lower temperature with reducing samples, which detriment A-site ordering ABO3 perovskite. A higher degree favors more homogenous structural modulation, stabilizes low phase results shift temperature. Another peak just below observed, attributed domain wall motions. correlation between mobility walls P...
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