Investigation of valence states in the perovskite oxides, LaAFeNbO(6) (A =Ca, Sr)

Authors
Ramakrishnan, PA Varadaraju, UV Berry, FJ
Citation
Pa. Ramakrishnan et al., Investigation of valence states in the perovskite oxides, LaAFeNbO(6) (A =Ca, Sr), MATER LETT, 38(6), 1999, pp. 396-400
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS LETTERS
ISSN journal
0167577X → ACNP
Volume
38
Issue
6
Year of publication
1999
Pages
396 - 400
Database
ISI
SICI code
0167-577X(199903)38:6<396:IOVSIT>2.0.ZU;2-Z
Abstract
Compounds of the type, LaAFeNbO(6) (A = Ca Sr) have been synthesized to stu dy the electrical and magnetic properties and to examine valence degeneracy . The results show that valence degeneracy is not operative and the compoun ds are insulating. Magnetic susceptibility data show that part of the Fe is in Fs(2+) state, thus oxidizing part of Nb4+ to Nb5+ by an internal redox mechanism. The presence of mixed valent Fe is confirmed by Mossbauer spectr a. (C) 1999 Elsevier Science B.V. All rights reserved.