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Birefringence and ultrasonic measurements were done for ferroelectric RbHSeO4 crystal. Influences of both stresses (σ_{i}) and pressure on the properties and phase transition were studied as well. The observed dependence of δ(Δn_{b}) = f(σ_{5}) shows hysteresis loop characteristic of ferroelectric phase whereas the dependence of δ(Δn_{c}) = f(σ_{6}) shows hysteresis loop characteristic of ferroelastic...
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