Neutron Diffraction Magnetic and Mossbauer Spectroscopic Studies of Pb0.8Bi0.2Fe0.728W0.264O3 and Pb0.7Bi0.3Fe0.762W0.231O3 Ceramics

We report on high-temperature crystallographic structure, magnetic and physical properties of chemically B-site disordered lead-bismuth iron tungstate, (PFW)1?x(BFO)x (which can be written as Pb0.8Bi0.2Fe0.728W0.264O3 (0.8PFW–0.2BFO) for x = 0.2 Pb0.7Bi0.3Fe0.762W0.231O3 (0.7PFW–0.3BFO) 0.3) or PBFW), solid solutions through neutron diffraction (ND), magnetization, electron paramagnetic resonance, Mössbauer spectroscopic studies. From the high temperature susceptibility measurement, it is observed that increase antiferromagnetic to phase transition around TN 435 K (Pb0.8Bi0.2Fe0.728W0.264O3) 504 (Pb0.7Bi0.3Fe0.762W0.231O3), compared pure PFW. Room-temperature study confirms formation pseudo cubic structure with Pm-3m space group, whereas commensurate G-type ordering. The obtained dependent structural parameters from ND, evidenced existence strong spin-lattice coupling both compounds. discontinuity in Pb/Bi–O bond length ferroelectric (TC) indicates presence magnetoelectric coupling. Interestingly, microscopic 1:1 ordered nanoclusters PBFW exhibits ferrimagnetic clusters along order opening M vs H hysteresis curves lower field regime. EPR studies well support property also reveal Fe+3 state, weak signal broader linewidth spectra exhibit disorderliness.