Lattice dynamics of a Rb2KScF6 crystal in unstable cubic and tetragonal phases and in a stable monoclinic phase |
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Authors: | V I Zinenko N G Zamkova |
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Institution: | (1) L. V. Kirenskii Institute of Physics, Siberian Branch of the Russian Academy of Sciences, 660036 Krasnoyarsk, Russia |
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Abstract: | The results of a nonempirical calculation of the static and dynamic properties of a Rb2KScF6 crystal with elpasolite structure in cubic, tetragonal, and monoclinic phases are presented. The calculation is performed
on the basis of a microscopic model of an ionic crystal that takes account of the deformability and polarizability of the
ions. The deformability parameters of the ions are determined from the condition that the total energy of the crystal is minimum.
The computational results for the equilibrium lattice parameters are in satisfactory agreement with experimental data. Unstable
vibrational modes are found in the vibrational spectrum of the lattice in the cubic and tetragonal phases. These modes occupy
the phase space throughout the entire Brillouin zone. The characteristic vectors of the most unstable mode at the center of
the Brillouin zone of the cubic phase are related to the displacements of the fluorine ions and correspond to rotation of
ScF6 octahedra. Condensation of this mode leads to a tetragonal distortion of the structure. In the tetragonal phase the most
unstable mode belongs to the boundary point of the Brillouin zone and condensation of this mode leads to monoclinic distortion
with doubling of the unit-cell volume. In the monoclinic phase unstable modes are absent in the vibrational spectrum of the
lattice.
Fiz. Tverd. Tela (St. Petersburg) 41, 1297–1305 (July 1999) |
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