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Processes of structural disordering and superionic phase transition in the Li0.12Na0.88TayNb1-yO3 solid solution

N. V. SIDOROV1, M. N. PALATNIKOV1,* , N. A. TEPLYAKOVA1, E. Yu. OBRYADINA1

Affiliation

  1. The laboratory of materials for electronic engineering, I. V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials of Kola Science Center of Russian Academy of Sci

Abstract

Structural disordering and phase transitions in the Li0.12Na0.88TaуNb1-уO3 solid solutions were investigated by Raman spectra. Phase transition from ferroelectric to antiferroelectric phase at t=300÷350о С is clearly seen. In this case the line, corresponding to the stretching modes of oxygen atoms disappears. Thermal disordering of the Li0.12Na0.88TaуNb1-уO3 solid solutions structure, introduced by mobile lithium ions, happens gradually. It is facilitated by misorientation and considerable deformation of oxygen octahedra with changing of their symmetry. Static disordering of the structural units in the Nb5+ and Ta5+ sublattice lowers the point of ferroelectric-antiferroelectric phase transition and can facilitate the transition to the superionic state. However, from the data obtained, it is clear that the phase transition to the superionic state doesn’t appear in Raman spectra..

Keywords

Raman Spectroscopy, Solid Solutions, Superionic Transport, Ferroelectricity, Phase Transitions.

Submitted at: Feb. 7, 2013
Accepted at: Feb. 20, 2013

Citation

N. V. SIDOROV, M. N. PALATNIKOV, N. A. TEPLYAKOVA, E. Yu. OBRYADINA, Processes of structural disordering and superionic phase transition in the Li0.12Na0.88TayNb1-yO3 solid solution, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 1-2, pp. 103-106 (2013)