2003 Volume 72 Issue 12 Pages 3123-3127
We propose the use of Mössbauer quadrupole effect as a sensitive probe to determine structural feature precisely. This method has been applied, together with the high-resolution neutron powder diffraction measurements, to the structure analysis of the ordered double perovskites Sr2FeMoO6 and Sr2FeReO6 at room temperature. Results of Rietveld refinement were verified by the Mössbauer quadrupole effect. We have concluded that the space groups of Sr2FeMO6 (M = Mo and Re) are I4⁄m, but not I4⁄mmm as has been frequently pronounced. The spins of M = Re specimen are aligned in ab-plane, while those of M = Mo specimen are aligned in ab-plane or along c-axis.
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