Crystal and magnetic structures of high pressure perovskite-type oxyfluorides,PbFeO2F and 0.5PbFeO2F-O-SPbTiO3 [Pb(Fe0.5Ti0.5)O2.5F0.5]

The perovskites PbFeO2F and 0.5PbFeO2F-0.5PbTiO 3 were synthesized at high temperatures (1000 °C) and high pressures (4-6 GPa). The crystal and magnetic structures were determined using powder neutron diffraction. Quenched PbFeO2F has the cubic perovskite-type, Pm3m, structure in which the Pb ion shifts from ideal A-site along the <110> directions, which is in good accordance with a previous report. The magnetic structure is anti ferromagnetic …