Tuning of Structure, Morphology and Magnetism in Postperovskite Oxide Solid Solutions
High-quality polycrystalline samples of postperovskite type CaIr1−x Pt x O3 solid solutions (x = 0.3, 0.5, 0.7) and CaIr0.5Rh0.5O3 have been synthesized at a pressure of 15 GPa, and their structures and properties are compared with those of CaIrO3. Substantial [100] grain growth is observed in all s...
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Veröffentlicht in: | Chemistry of materials 2011-01, Vol.23 (1), p.114-121 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | High-quality polycrystalline samples of postperovskite type CaIr1−x Pt x O3 solid solutions (x = 0.3, 0.5, 0.7) and CaIr0.5Rh0.5O3 have been synthesized at a pressure of 15 GPa, and their structures and properties are compared with those of CaIrO3. Substantial [100] grain growth is observed in all samples, leading to pronounced texture even in powdered materials. Small changes in the lattice constants and octahedral distortions are observed across the CaIr1−x Pt x O3 series. CaIrO3 is semiconducting and shows temperature-independent paramagnetism and an ordered moment of 0.04 μB below a 108 K magnetic transition. Doping with Pt or Rh induces Curie−Weiss paramagnetism and suppresses the magnetic transition to zero for ∼40% Pt doping. The anisotropic structure and morphology of CaIrO3 combined with the Ir4+ spin−orbit coupling results in a large magnetic anisotropy constant of 1.77 × 106 J m−3, comparable to values for permanent magnet materials. |
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ISSN: | 0897-4756 1520-5002 |
DOI: | 10.1021/cm102660q |