Abstract
The paper reviews the results of experimental and theoretical studies of ferroic phase transitions in β-LiNH4SO4 and its deuterated analogue. β-LiNH4SO4 undergoes succesive phase transitions: a paraelectric - ferroelectric phase transition at T1 ≃ 462 K, a ferroelectric - ferroelastic phase transition at T2 ≃ 283 K and a transition from one ferroelastic phase to the other at T3 ≃ 28 K. Attention is focused on the influence of the order of phase transitions on the pattern of ferroelectric and ferroelastic domain structure, and also on the role played by the dynamics of molecular groups in the mechanism of transitions. The pre-transition effect connected with the ferroelectric-paraelectric transition: heterophase, capable of accounting for anomalies in different physical properties present 1-3 K below T1 is shown. The anomalous temperature variation of spontaneous polarisation of the crystal is discussed within the framework of the phenomenological model of weak ferroelectrics.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
