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Author (up) Blanco, M.C.; Franco, D.G.; Jalit, Y.; Pannunzio Miner, E.V.; Berndt, G.; Paesano Jr., A.; Nieva, G.; Carbonio, R.E.
Title Synthesis, magnetic properties and Mössbauer spectroscopy for the pyrochlore family Bi2BB′O7 with B=Cr and Fe and B′=Nb, Ta and Sb Type Journal Article
Year 2012 Publication Physica B: Condensed Matter Abbreviated Journal Frontiers of Condensed Matter V (FCM 2010)
Volume 407 Issue 16 Pages 3078-3080
Keywords Pyrochlores; Crystal structure; Magnetism; Mösbauer spectroscopy; Displacive disorder
Abstract The samples Bi2BB′O7, with B=Cr and Fe and B′=Nb, Ta and Sb were prepared by solid state method. The crystallographic structure was investigated on the basis of X-ray powder diffraction data. Rietveld refinements show that the crystal structure is cubic, space group Fd-3m. The Bi3+ cation on the eight-coordinate pyrochlore A-site shows displacive disorder, as a consequence of its lone pair electron configuration. There is also a considerable A-site disorder shown by Rietveld Analysis and confirmed in the case of the iron containing samples with Mössbauer spectroscopy. The magnetic measurements show paramagnetic behavior at all temperatures for the Cr oxides. The Fe pyrochlores show antiferromagnetic order around 10 K.
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0921-4526 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ hernan @ Serial 647
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