Sol–gel synthesis and investigation of structural, electrical and magnetic properties of Pb doped La0.1Bi0.9FeO3 multiferroics

Abstract

A sol-gel based auto-combustion technique has been employed to synthesize polycrystalline La 0.1 Bi 0.9-x Pb x FeO 3 (x = 0.0, 0.05, 0.10, 0.20, 0.30) ceramics. The samples have been characterized by X-ray diffraction, scanning electron microscopy, an LCR-meter and a vibrating sample magnetometer for their structural and morphological features, as well as electrical and magnetic properties, respectively. The structural analysis revealed that when Pb was doped at Bi-sites in La 0.1 Bi 0.90 FeO 3 , the host retained the rhombohedrally distorted perovskite structure, attributed to the non centro-symmetric space group R3c. The surface morphological studies revealed that the grain size was increased and formed agglomerates at high concentrations of Pb contents. The dielectric parameters displayed conventional ferrite behavior depicting high values at low frequencies and decreasing with rise in frequencies, leading to constant values at still higher frequencies. The magnetic properties were changed nonmonotonically with increasing Pb concentration. This nonmonotonical behavior with increasing Pb could be attributed to the canting of the antiferromagnetic spins in BiFeO 3 based multiferroics.

Synthesis of Polymer-based ZnO/TiO2 NCs Flexible Sheets as High Dielectric Materials

“…The values of ′ at 100 Hz are found to be 6.87, 9.10, 13.96 and 14.56 corresponding to samples A-1, A-2, A-3 and A-4 respectively which indicate that the values of ′ of polymer-based NCs are increased with increasing wt.% of nanofillers. The higher values of ′ are due to slow electric filed in low frequency range which provides sufficient time for both permanent and induced dipoles to align themselves which enhances the interfacial polarization (IP) so called Maxwell Wagner Sillars (MWS) effect[14]. This effect becomes more prominent as the wt.% of nanofillers is increased in polymer-based NCs.…”