Oxygen vacancy ordering in strontium doped rare earth cobaltate perovskites Ln1−xSrxCoO3−δ (Ln = La, Pr and Nd; x > 0.60) |
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Authors: | M James T Tedesco RL Withers |
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Affiliation: | a Bragg Institute, Australian Nuclear Science and Technology Organisation, Building 58, ANSTO, PMB 1, Menai NSW 2234, Australia b Materials and Engineering Sciences, Australian Nuclear Science and Technology Organisation, PMB 1, Menai NSW 2234, Australia c Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia |
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Abstract: | A family of Sr-doped perovskite compounds Ln1−xSrxCoO3−δ (Ln = La3+, Pr3+ and Nd3+; x > 0.60), were prepared by sol-gel chemistry and reaction at 1100 °C under 1 atm of oxygen. This structural family has been shown to be present only for rare earth ions larger than Sm3+ and an upper limit of Sr2+ solubility in these phases was found to exist between x = 0.90 and 0.95. X-ray diffraction shows oxygen-deficient, simple cubic (Pm-3m) perovskite crystal structures. The combination of electron and powder neutron diffraction reveals that oxygen vacancy ordering occurs, leading to a tetragonal (P4/mmm) superstructure and a doubling of the basic perovskite unit along the crystallographic c-axis. No additional Ln3+/Sr2+ cation ordering was observed. |
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Keywords: | A Oxides C Electron diffraction C Thermogravimetric analysis (TGA) D Crystal structure |
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