THERMOMECHANICAL AND THERMOPHYSICAL PROPERTIES OF LITHIUM NIOBATE

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Abstract

A new thermodynamic model of lithium niobate is proposed, based on the use of the sixth-degree Landau potential. Its feature is the nonlinear dependence of the coefficient at the square of polarization along the polar direction on temperature. In contrast to the previously used fourth-degree potential, this ensures good agreement between the behavior of spontaneous polarization and deformation calculated on its basis and the results of experimental studies. Using the proposed thermodynamic potential, a complete set of material constants determining the thermomechanical properties of lithium niobate, as well as constants of the electro-optical and acousto-optical effects in a wide range of temperature changes, is constructed. Independence of the elastic moduli of lithium niobate from temperature is confirmed, in contrast to piezoelectric, acousto-optical and electro-optical constants, some of which undergo significant changes. The results are of interest when choosing the orientation of the crystal cut in the process of developing micro- and nanoscale acousto- and optoelectronic devices.

About the authors

V. B. Shirokov

Southern Scientific Center RAS

Email: vkalin415@mail.ru
Rostov-on-Don, Russia

I. B. Mikhailova

Southern Scientific Center RAS

Email: vkalin415@mail.ru
Rostov-on-Don, Russia

A. S. Turchin

Southern Scientific Center RAS

Author for correspondence.
Email: vkalin415@mail.ru
Rostov-on-Don, Russia

V. V. Kalinchuk

Southern Scientific Center RAS

Email: vkalin415@mail.ru
Rostov-on-Don, Russia

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