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• W2049486614 endingPage "425401" @default.
• W2049486614 startingPage "425401" @default.
• W2049486614 abstract "Calcium stannate perovskite (CaSnO3) has been studied by Raman spectroscopy at two excitation wavelengths (514.5 and 632.8 nm). No phase transition was observed. Rather, the thermal evolution of the Raman lines showed a high degree of harmonicity with small Grüneisen parameters and thermal line broadening following Γ = Acothθ/T, where the quantum temperature θ is determined by the phonon branch without further coupling with other degrees of freedom. The geometrical nature of phonon lines has been identified. High-temperature powder x-ray diffraction measurements provide thermal expansion coefficients of αx = 13.9 × 10−6 K−1, αy = 2.7 × 10−6 K−1, αz = 14.3 × 10−6 K−1. The strongly quasi-harmonic behaviour observed and the lack of any indication of instability with respect to the post-perovskite structure points to the strongly first-order character of the reported perovskite to post-perovskite phase transition in this material, which appears to behave as a very good analogue to MgSiO3 in the Earth's interior." @default.
• W2049486614 created "2016-06-24" @default.
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• W2049486614 date "2011-10-04" @default.
• W2049486614 modified "2023-10-18" @default.
• W2049486614 title "Raman spectroscopy of CaSnO₃at high temperature: a highly quasi-harmonic perovskite" @default.
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• W2049486614 doi "https://doi.org/10.1088/0953-8984/23/42/425401" @default.
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