High magnetic ordering temperature in the perovskites Sr4-xLaxFe3ReO12 (x= 0.0, 1.0, 2.0)
- ORNL
- State University of New Jersey, The
- Rowan University
- Hebrew University of Jerusalem
- University of Antwerp
A series of perovskites Sr4-xLaxFe3ReO12 (x = 0.0, 1.0, 2.0) has been prepared by wet chemistry methods. The structure analyses by powder x-ray, 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 state 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 M ssbauer 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 ~ 750 K.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1052271
- Journal Information:
- Journal of Solid State Chemistry, Vol. 194
- Country of Publication:
- United States
- Language:
- English
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