Low-temperature heat capacity of NaNbO3 compound

Authors
Drulis, M Konieczny, K
Citation
M. Drulis et K. Konieczny, Low-temperature heat capacity of NaNbO3 compound, MAT SCI E B, 72(1), 2000, pp. 19-22
Citations number
17
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
ISSN journal
09215107 → ACNP
Volume
72
Issue
1
Year of publication
2000
Pages
19 - 22
Database
ISI
SICI code
0921-5107(20000301)72:1<19:LHCONC>2.0.ZU;2-O
Abstract
The specific heat measurements of NaNbO3 crystals were carried out in the t emperature range 4.5-278 K. The obtained data exhibit so-called non-Debye f eatures at low temperatures and do not reveal any anomaly connected with an tiferroelectric-ferroelectric phase transition. The experimental data are f itted and discussed with an expression containing the Debye and an Einstein contributions with Theta(D) = 520, 612K and Theta(E) = 183K for the low an d high temperature phases, respectively. The presence of approximate to T-2 term has been found in the lowest temperatures. (C) 2000 Published by Else vier Science S.A. All rights reserved.