Effect of Nanoscale Defects on the Physical Properties of Lithium Niobate and Lithium Tantalate Crystals


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Resumo

The elastic, ferroelectric, and transport properties of congruent lithium niobate and lithium tantalate crystals are studied in the temperature range of 77–450 K, depending on the conditions for recovery annealing. Significant changes in the elastic moduli and electrical conductivity that correlate with an increase in the displacement of the off-center Nb5+ (Ta5+) ions along the trigonal \(\overline C \) axis of the oxygen octahedra NbO6 (TaO6) are found in the interval 120 to 300 K as a result of more detailed studies. The attenuation of acoustic waves is suppressed as the temperature falls, which can be explained by an increase in the degree of ordering of NbO6 (TaO6) clusters. It may be assumed that the strong change in electrical conductivity correlates with the concentration of point nanoscopic defects (antisite defects NbLi5+(TaLi5+), coupled polarons NbLi4+(TaLi4+), and bipolarons).

Sobre autores

A. Golenishchev-Kutuzov

Kazan State Power Engineering University

Autor responsável pela correspondência
Email: campoce6e@gmail.com
Rússia, Kazan, 420066

V. Golenishchev-Kutuzov

Kazan State Power Engineering University

Email: campoce6e@gmail.com
Rússia, Kazan, 420066

R. Kalimullin

Kazan State Power Engineering University

Email: campoce6e@gmail.com
Rússia, Kazan, 420066

A. Semennikov

Kazan State Power Engineering University

Email: campoce6e@gmail.com
Rússia, Kazan, 420066

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