This article is cited in 18 papers

Lattice dynamics

Structure and lattice dynamics of the high-pressure phase in the ScF$_3$ crystal

K. S. Aleksandrov^a, N. V. Voronov^a, A. N. Vtyurin^a, A. S. Krylov^a, M. S. Molokeev^a, A. S. Oreshonkov^a, S. V. Goryainov^b, A. Yu. Likhacheva^b, A. I. Ancharov<sup>c

a</sup> L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk
^c Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk

Abstract: The high-pressure phase of the ScF$_3$ crystal has been studied using synchrotron radiation diffraction and Raman scattering. This phase existing in the pressure range 0.6–3.2 GPa is optically anisotropic: its structure is described by space group $R\bar3c$, $Z$ = 2, and the transition is associated with the rotation of ScF$_6$ octahedra around the threefold axis. The pressure dependences of the lattice parameters and the rotation angle have been determined. The number of lines in the Raman spectrum corresponds to the expected number for this structure; the recovery of soft modes has been observed above the phase transition.

Received: 25.05.2010

 English version: Physics of the Solid State, 2011, 53:3, 564–569

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