Crystal-Optic Observation of High-Pressure Phase Transition in Barium Sodium Niobate
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The first observation of high-pressure phase transition in BNN is reported. Both ferroelastic domain pattern and the birefringence <I>Δn</I><SUB>xy</SUB> vanishes at 22.0±0.5 kbar and room temperature. The <I>dT</I><SUB>tr</SUB>⁄<I>dP</I> is positive and approximately equal to 8.6°C/kbar in the temperature range between −25°C and 75°C.
- Journal of the Physical Society of Japan
Journal of the Physical Society of Japan 45(4), 1433-1434, 1978
THE PHYSICAL SOCIETY OF JAPAN