Optical and Ultrasonic Investigations of Phase Transitions in Ferroelectric RbHSeO_{4} Single Crystal

• Authors: S. Sveleba , M. Bublik , I. Polovinko , A. Kityk , V. Sopronuk , Z. Czapla
• Languages of publication: EN

Abstracts

EN

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 phase. Birefringence measurements prove the phase transition to ferroelectric phase at 373 K. Additionally, the phase transition was found at 398 K. The new phase may be regarded as an incommensurate one. On the grounds of the stresses influence the phase diagram is constructed in coordinates T, σ_{5}. The linear decrease in T_{c} with increase in pressure is observed in ultrasonic studies and it is similar to the results obtained in DSC measurements.

Keywords

EN

64.70.Kb; 77.20.+y; 05.70.Fh

Discipline

• 05.70.Fh: Phase transitions: general studies(see also 05.30.Rt Quantum phase transitions in quantum statistical mechanics; 64.70.Tg Quantum phase transitions in specific phase transitions; 73.43.Nq Quantum phase transitions in quantum Hall effects; for superconductivity phase diagrams, see 74.25.Dw; for magnetic phase boundaries, see 75.30.Kz; for ferroelectric phase transitions, see 77.80.B-)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1992
• Volume: 82
• Issue: 3
• Pages: 481-486

Dates

published

1992-09

received

1992-05-04

Contributors

author

S. Sveleba

• Lviv State University, Universitetska 1, 290005, Lviv, Ukraine

author

M. Bublik

• Lviv State University, Universitetska 1, 290005, Lviv, Ukraine

author

I. Polovinko

• Lviv State University, Universitetska 1, 290005, Lviv, Ukraine

author

A. Kityk

• Lviv State University, Universitetska 1, 290005, Lviv, Ukraine

author

V. Sopronuk

• Lviv State University, Universitetska 1, 290005, Lviv, Ukraine

author

Z. Czapla

• Institute of Experimental Physics, University of Wrocław, Cybulskiego 36, 50-205 Wrocław, Poland

Identifiers

DOI

10.12693/APhysPolA.82.481