BROWSE

Related Researcher

Author's Photo

Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

ITEM VIEW & DOWNLOAD

Investigation of the depolarisation transition in Bi-based relaxor ferroelectrics

Cited 1 times inthomson ciCited 0 times inthomson ci
Title
Investigation of the depolarisation transition in Bi-based relaxor ferroelectrics
Author
Woodward, David I.Dittmer, RobertJo, WookWalker, DavidKeeble, Dean S.Dale, Matthew W.Roedel, JuergenThomas, Pam A.
Keywords
Broad temperature ranges; Displacive phase transitions; Electrical poling; Freezing temperatures; Orders of magnitude; Relaxor ferroelectric; Room temperature; Structural methods
Issue Date
2014-03
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.115, no.11, pp. -
Abstract
The loss of macroscopic polarisation in relaxor ferroelectric (Na0.8K0.2)(1/2)Bi1/2TiO3 ceramics doped with BiZn1/2Ti1/2O3 has been studied by electrical and structural methods. These indicate that the phenomena that are coupled in a displacive phase transition are not necessarily coupled in the depolarisation of Na1/2Bi1/2TiO3-based relaxors and a concept of correlated and uncorrelated switching of dipoles within adjacent unit cells is used to explain this. Second harmonic generation performed on poled ceramics during heating yields values of the freezing temperature and shows a broad temperature range of similar to 100 degrees C across which the structure changes from field-induced ferroelectric to an equilibrium-state ergodic relaxor. Electrical poling at room temperature causes poled regions to increase in size by similar to 2 orders of magnitude. A model illustrating the main steps in thermal depolarisation is described that does not require a phase transition to take place on a unit cell level.
URI
Go to Link
DOI
10.1063/1.4869132
ISSN
0021-8979
Appears in Collections:
MSE_Journal Papers
Files in This Item:
2-s2.0-84897864252.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU