Magnetic interaction in ferrous antimonite, FeSb2O4, and some derivatives.
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 Mössbauer 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.
School of Chemistry, The University of Birmingham, Birmingham B15 2TT, UK.
R D
RD
Bayliss
F J
FJ
Berry
B P
BP
de Laune
C
C
Greaves
O
O
Helgason
J F
JF
Marco
M F
MF
Thomas
L
L
Vergara
M J
MJ
Whitaker
D000965:Antimony / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D008280:Magnetics; D008422:Materials Testing; D008956:Models, Chemical; D015204:Spectroscopy, Mossbauer
D007854:Lead; C061374:antimonite; D000965:Antimony; D007501:Iron