The crystal and magnetic structures of the ordered perovskite Pb2FeSbO6 studied by neutron diffraction and Mössbauer spectroscopy

Abstract The structural and magnetic ordering of Pb 2 FeSbO 6 was studied by means of Mossbauer spectroscopy and neutron powder diffraction in the temperature range from 5 to 300 K. The structural phase transition from the initial cubic phase Fm 3 - m to the tetragonal I 4 / m phase was observed in temperature range 170-190 K. The antiferromagnetic order with a propagation vector q = (½, ½, 0) was found at temperature T N =30 K. The temperature dependences of the hyperfine parameters of Mossbauer spectra and magnetic moments for Pb 2 FeSbO 6 at low temperatures were obtained. The relationships between the short-range cation ordering observed by Mossbauer spectroscopy and the long-range cation ordering observed by neutron powder diffraction are discussed.