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A study on the nuclear and magnetic structure of the double perovskites A2FeWO6 (A = Sr, Ba) by neutron powder diffraction and reverse Monte Carlo modeling |
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| Authors: | A.K. Azad,S.-G. Eriksson,A. Mellergå rdS.A. Ivanov,J. EriksenH. Rundlö f |
| Affiliation: | a Department of Inorganic Chemistry, University of Gothenburg, SE-412 96 Göteborg, Sweden b Studsvik Neutron Research Laboratory, Uppsala University, SE-611 82 Nyköping, Sweden c Karpov Institute of Physical Chemistry, 103064 Moscow, Russia |
| Abstract: | Perovskite-type complex metal oxides A2FeWO6 (A=Sr, Ba) were prepared by a standard solid state reaction method. Rietveld analysis of neutron powder diffraction (NPD) data at 295 K shows that the Sr2FeWO6 (SFW) compound adopts a monoclinic unit cell (space group P21/n, a=5.6480(4), b=5.6088(4), c=7.9362(6) Å and β=89.99(2)°), and the Ba2FeWO6 (BFW) compound is tetragonal (space group I4/m, a=5.7547(4), c=8.125(1) Å). A combination of a reverse Monte Carlo (RMC) technique and Rietveld analysis shows that the low temperature (10 K) magnetic structures of SFW and BFW are antiferromagnetic based on a unit cell related to that of the nuclear structure by a propagation vector, k=(01/21/2). The magnetic moment of iron was found to be 3.86(4)μB and 3.49(2)μB at 10 K for the Sr- and the Ba-containing compounds, respectively. |
| Keywords: | A. Magnetic materials A. Oxides C. Neutron scattering D. Crystal structure D. Magnetic structure |
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