High magnetic ordering temperature in the perovskites Sr4axLaxFe3ReO12 (x=0.0, 1.0, 2.0)

A series of perovskites Sr4axLaxFe3ReO12 (x=0.0, 1.0, 2.0) has been prepared by wet chemistry methods. The structure analyses by powder X-ray and neutron diffraction and electron microscopy show that these compounds adopt simple perovskite structures without cation ordering over the B sites: tetrago...

Full description

Saved in:
Bibliographic Details
Published in:Journal of solid state chemistry 2012-10, Vol.194, p.48-58
Main Authors: Retuerto, M, Li, M-R, Go, Y B, Ignatov, A, Croft, M, Ramanujachary, K V, Herber, R H, Nowik, I, Hodges, J P, Dachraoui, W, Hadermann, J, Greenblatt, M
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Cations
Magnetic properties
Mossbauer spectroscopy
Neutron diffraction
Order disorder
Perovskites
X-rays
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A series of perovskites Sr4axLaxFe3ReO12 (x=0.0, 1.0, 2.0) has been prepared by wet chemistry methods. The structure analyses by powder X-ray and neutron diffraction and electron microscopy show that these compounds adopt simple perovskite structures without cation ordering over the B sites: tetragonal (I4/mcm) for x=0.0 and 1.0 and orthorhombic (Pbmn) for x=2.0. The oxidation states of the cations in the compound with x=0.0 appear to be Fe3+/4+ and Re7+ and decrease for both with La substitution as evidenced by X-ray absorption spectroscopy. All the compounds are antiferromagnetically ordered above room temperature, as demonstrated by Mossbauer spectroscopy and the magnetic structures, which were determined by powder neutron diffraction. The substitution of Sr by La strongly affects the magnetic properties with an increase of TN up to a14750 K.
ISSN:0022-4596
DOI:10.1016/j.jssc.2012.06.031