Magnetic interaction in ferrous antimonite, FeSb2O4, and some derivatives |
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Authors: | Bayliss R D Berry F J de Laune B P Greaves C Helgason O Marco J F Thomas M F Vergara L Whitaker M J |
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Institution: | School of Chemistry, The University of Birmingham, Birmingham B15 2TT, UK. |
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Abstract: | Ferrous antimonite, FeSb(2)O(4), which is isostructural with Pb(3)O(4), and some lead-?and cobalt-doped variants of composition FeSb(1.5)Pb(0.5)O(4) and Co(0.5)Fe(0.5)Sb(1.5)Pb(0.5)O(4) have been examined by (57)Fe and (121)Sb?M?ssbauer spectroscopy. Antimony is present as Sb(3+). The presence of Pb(2+) on the antimony site induces partial oxidation of Fe(2+) to Fe(3+). There is no Verwey-type transition in which electrons are shared between iron in different oxidation states. The quasi-one-dimensional magnetic structure gives rise to situations in which weakly coupled Fe(2+) ions can coexist in a non-magnetic state alongside Fe(3+) ions in a magnetically ordered state. |
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