DIELECTRIC-RELAXATION IN BA2NANB5(1-X)TA5XO15 SINGLE-CRYSTALS

Authors
MIZARAS R TAKASHIGE M BANYS J KOJIMA S GRIGAS J HAMAZAKI SI BRILINGAS A
Citation
R. Mizaras et al., DIELECTRIC-RELAXATION IN BA2NANB5(1-X)TA5XO15 SINGLE-CRYSTALS, Journal of the Physical Society of Japan, 66(9), 1997, pp. 2881-2885
Citations number
14
Categorie Soggetti
Physics
Journal title
Journal of the Physical Society of Japan → ACNP
ISSN journal
00319015
Volume
66
Issue
9
Year of publication
1997
Pages
2881 - 2885
Database
ISI
SICI code
0031-9015(1997)66:9<2881:DIBS>2.0.ZU;2-Q
Abstract
This paper presents the results of dielectric dispersion in Ba2NaNb5(1 -x)Ta5xO15 (BNNT) single crystals over the frequency range 1 kHz to 4 GHz. The fundamental dielectric dispersion occurs above 10(7) Hz and i s caused by a soft relaxational mode. This mode gives the main contrib ution to the high static permittivity which fits the Curie-Weiss law. The results indicate the anharmonic motion of the Nb(Ta) atoms and the order-disorder nature of the proper ferroelectric phase transition in BNNT.