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Pressure-Induced Phase Transitions in RbMnCl3 Crystal—Raman Spectra and Lattice Dynamics

Author： KRYLOV A. KRYLOVA S. SHEFFER A. VTYURIN A. ZAMKOVA N. ZINENKO V. GORYAINOV S.

Publisher： Taylor & Francis Ltd

ISSN： 0015-0193

Source： Ferroelectrics, Vol.307, Iss.1, 2004-01, pp. : 103-118

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

Raman scattering spectra of RbMnCl3 crystal has been studied at ambient conditions and under high hydrostatic pressure. Results are interpreted within abinitio lattice dynamics approach. Experimental results agree rather well with numerical simulations at the lower frequencies range, while a bit worse—for higher frequency modes. The first transition was observed at 0.7 GPa in good agreement with earlier measurements, and spectral transformation agrees with transition to the perovskite cubic phase predicted theoretically. New transitions were found at 1.1 GPa and 5 GPa, presumably—to distorted cubic phases.

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