CaPtO3 as a novel post-perovskite oxide
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Structural, morphological, magnetic, and thermal properties have been investigated for a novel post-perovskite oxide CaPtO3 synthesized under high pressure. By comparing obtained structural parameters with those for known post-perovskite compounds, we argue that the chemical bond has a strong covalent character. Precise measurements of the Langevin susceptibility χ 0 = −9.6 × 10−5 emu/mol and Debye temperature θ ∼ 470 K provide a good opportunity to confirm the reliability of first-principle calculations on predicting physical properties of the Earth’s D” layer.
KeywordsPost-perovskite CaPtO3 High-pressure synthesis Rietveld analysis Morphology
We wish to thank H. Schulze (Bayreuth) for his assistance with TEM sample preparation, A. Yamamoto (Tsukuba) for his cooperation in the structural analysis, K. Niwa (Kashiwa), T. Okada (Kashiwa), A. Yamamoto (Wako), and P. Cordier (Lille) for enlightening discussions, and Y. Kiuchi (Kashiwa) for her technical assistance in SEM experiments. We also acknowledge two anonymous reviewers for useful comments. One of the authors (K. O.) is supported by the Japan Society for the Promotion of Science for Young Scientists.
- Ashcroft NW, Mermin ND (1976) Solid State Physics. Saunders College, PhiladelphiaGoogle Scholar
- Gibbs GV, Downs JW, Boisen MB (1994) The elusive SiO bond. Rev Mineral 29:331–368Google Scholar
- Pauling L (1960) The Nature of the Chemical Bond. Cornell University Press, New YorkGoogle Scholar
- Wong-Ng W, Kaduk JA, Young RA, Jiang F, Swartzendruber LJ, Brown HJ (1999) Investigation of (Sr4–δCaδ)PtO6 using X-ray Rietveld refinement. Powder Diffr 14:181–189Google Scholar
- Zhao J, Ross NL, Angel RJ (2004) New view of the high-pressure behaviour of GdFeO3-type perovskites. Acta Crystallogr Sect B60:263–271Google Scholar