, Volume 51, Issue 1, pp 23-28

Crystal structure of La3Nb0.5Ga5.5O14 at 20 K

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Abstract

The atomic structure of La3Nb0.5Ga5.5O14 single crystals (space group P321, R = 2.21%, R w = 2.31%) at 20 K was determined using X-ray diffraction. A comparative analysis of the structural characteristics determined at temperatures of 293 and 20 K did not reveal a noticeable redistribution of bond valences that could be considered precursors of a possible phase transition accompanied by the reduction of the symmetry of the crystal. The assumption was made that the anomalous behavior of the permittivity e 33 of the La3Nb0.5Ga5.5O14 single crystals is associated with the decrease in the possible relative displacements of the Ga(1) and Nb atoms occupying the cation position with point symmetry 32 in a 1: 1 ratio.

Original Russian Text © T.S. Chernaya, S.S. Kazantsev, V.N. Molchanov, I.A. Verin, M.K. Blomberg, B.A. Maksimov, V.I. Simonov, 2006, published in Kristallografiya, 2006, Vol. 51, No. 1, pp. 30–35.