Abstract
Abstract A careful study of the temperature dependence of the polar modes in LiNbO3 and LiTaO3 was undertaken to check the nature of a low-frequency anomaly of e near Tc . The recording of spectra was fulfilled in the geometry making active A 1(TO) modes related to ez(0) from 80 K up to the Curie point of the crystals. The existence of the “wings” near the central line was substantiated, the intensity of which grows when the temperature approaches Tc in the ferroelectric phase and decreases sharply above Tc , It was shown that the observed temperature shifts of A1 (TO) modes seem to be too small to explain the temperature dependence of ez(0) in the framework of LST-relation. Kramers-Kronig analysis with integrating over the low-frequency part of spectra provides a much better agreement between Raman spectra and ez(0) temperature dependences.
Sign-in/Register to access full text options 
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.
