Dielectric properties of Pb(Fe2/3W1/3)O-3-PbTiO3 solid-solution ceramics

Citation
Pm. Vilarinho et al., Dielectric properties of Pb(Fe2/3W1/3)O-3-PbTiO3 solid-solution ceramics, J AM CERAM, 83(5), 2000, pp. 1149-1152
Citations number
21
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN journal
00027820 → ACNP
Volume
83
Issue
5
Year of publication
2000
Pages
1149 - 1152
Database
ISI
SICI code
0002-7820(200005)83:5<1149:DPOPSC>2.0.ZU;2-5
Abstract
The dielectric properties of (1-x)Pb(Fe2/3W1/3)O-3. xPbTiO(3) solid solutio ns were investigated from 10(2) to 10(6) Hz in the temperature range 150-60 0 K. The phase transition of Pb(Fe2/3W1/3)O-3 (PFW) was shifted by PbTiO3 ( PT) additions to higher temperatures at a rate of 6.3 K/mol% of PT. The tem perature dependence of dielectric permittivity showed a sharper transition as the PT content increased, Dielectric measurements in a wide temperature range showed the presence of a second set of dielectric peaks at higher tem peratures (350-600 K), besides the ferroelectric-paraelectric phase transit ion, This second set of peaks vanished when the samples were annealed in ni trogen. The activation energy values for the second relaxation varied betwe en 0.50 and 0.63 eV, in agreement with the conduction activation energy det ermined for each sample. This relaxation is apparently related to electron holes.