Rare earth (La) and metal ion (Pb) substitution induced structural and multiferroic properties of bismuth ferrite

Abstract

Abstract:In this study, bulk samples of multiferroic with compositional formula, BiFeO 3 and Bi 0.825 A 0.175 FeO 3 (A = La, Pb), were synthesized by solid state reaction route. X-ray diffraction (XRD) along with the Rietveld refinement revealed the distorted rhombohedral (R3c) structure for pristine BiFeO 3 and Bi 0.825 La 0.175 FeO 3 and tetragonal (P4/mmm) for Bi 0.825 Pb 0.175 FeO 3 ceramic. To support the structural results, bond length between atoms for both of the compounds was calculated. A change in Raman mode position in BiFeO 3 (BFO) has been observed with La and Pb substitution from Raman scattering measurements and also recommended a structural change with rare earth and metal ion substitution at Bi site. From the frequency dependent dielectric constant and dielectric loss plots, a decrease in dielectric values with increase in frequency was observed for both of the samples. For microelectronic devices, porous ceramics with lower value of dielectric constant are most useful. Thus, further studies are also needed to carefully tune the magnetoelectric properties and structural distortion after La/Pb substitution in BFO.

Understanding the synergistic effect of piezoelectric polarization and the extra electrons contributed by oxygen vacancies on an efficient piezo-photocatalysis CO2 reduction

“…86-1518). 51 It can be clearly seen from Fig. S1 † that the diffraction peak of BiFeO 3−x shifts to the left, which indicates that the crystal cell parameters and crystal plane spacing of BiFeO 3−x obtained after the reduction of BiFeO 3 become larger, which is consistent with the information of a larger lattice spacing in the TEM results.…”

Structural and electrical properties of Bi3La2Ti3FeO15 ceramics

“…Once again, it has also lots of above inherent problems to be used for devices. In order to solve these problems, several attempts have been made to synthesize rare-earth [5][6][7][8][9][10][11][12][13] or other elements [14] modified BFO or/and fabricate its solid solution and/or composites with other ferroelectric/ferrites [15]. In view of the above, structural, dielectric, electrical and magnetic properties of a new multioferroic fabricated with ferroelectric Bi 4 Ti 3 O 12 (T c = 650°C) and BiFeO 3 in equal molecular ratio (i.e., Bi 5 Ti 3 FeO 15 ) have been reported [16][17][18][19][20][21][22][23][24].…”