The crystal and magnetic structures of the ordered perovskite Pb2FeSbO6 studied by neutron diffraction and Mössbauer spectroscopy
2019
Abstract
The structural and magnetic ordering of Pb2FeSbO6 was studied by means of Mössbauer spectroscopy and neutron powder diffraction in the temperature range from 5 to 300 K. The structural phase transition from the initial cubic phase Fm3-m to the tetragonal I4/m phase was observed in temperature range 170-190 K.
The antiferromagnetic order with a propagation vector q=(1/2, 1/2, 0) was found at temperatureT < TN=30 K. The temperature dependences of the hyperfine parameters of Mössbauer spectra and magnetic moments for Pb2FeSbO6 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.