INFLUENCE OF NONSTOICHIOMETRY ON THE FERR OELECTRIC, CONDUCTION AND RELAXATION PROPERTIES OF SR6TI2NB8O30-TYPE CERAMICS

Authors
ABALHASSAIN A RAVEZ J DOUMERC JP ELAATMANI M
Citation
A. Abalhassain et al., INFLUENCE OF NONSTOICHIOMETRY ON THE FERR OELECTRIC, CONDUCTION AND RELAXATION PROPERTIES OF SR6TI2NB8O30-TYPE CERAMICS, Journal de physique. III, 6(7), 1996, pp. 863-872
Citations number
9
Categorie Soggetti
Material Science","Phsycs, Fluid & Plasmas","Physics, Applied
Journal title
Journal de physique. III → ACNP
ISSN journal
11554320
Volume
6
Issue
7
Year of publication
1996
Pages
863 - 872
Database
ISI
SICI code
1155-4320(1996)6:7<863:IONOTF>2.0.ZU;2-F
Abstract
High densified Sr6Ti2Nb8O30 ceramics have been annealed under either o xidizing or reducing atmosphere. The materials crystallize with a tetr agonal tungsten bronze structure and show a ferroelectric-paraelectric transition. A space charge dielectric relaxation occurs at low temper ature for air sintered samples. Such a behavior disappears after long annealing under either oxygen (grains and grain boundaries are thus in sulators) or hydrogen-argon (the ceramics become extrinsic n-type semi conductor).