Modification in Structural, Morphological, Magnetic and Ferroelectric Properties of Calcium-Doped Bismuth Ferrite Nanoparticles

Abstract

The structural, morphological, magnetic and ferroelectric properties of calcium (Ca) doped bismuth ferrite (BFO) synthesized using a sol-gel method were studied. X-ray diffraction (XRD) analysis followed by Rietveld refinement revealed the lattice distortion of BFO after doping with 6% and 8% Ca. This also led to the reduction in particle size by creating oxygen vacancies, which was observed from the surface morphology using Field Emission Scanning Electron Microscopy (FESEM). The Magnetic properties exhibited some enhancements in saturation magnetization when the particle size was near a limiting value. The reduction in the coercive magnetic field with the increase in dopant concentration was also evident from the M-H hysteresis loop measured by Vibrating Sample Magnetometer (VSM). The Ferroelectric P-E hysteresis loop exhibited an increased symmetry in the hysteresis loop and increase in the polarization with the increase in %Ca. The 8% Ca doped BFO exhibited an incomplete saturation in the hysteresis loop and was evident to exhibit leakage current characteristics.
 Journal of Engineering Science 11(1), 2020, 123-131

Effect on Structural, Electrical and Temperature Sensing behavior of Neodymium Doped Bismuth Ferrite

“…The complex impedance spectroscopy is a unique and powerful tool to investigate the transport characteristics including bulk contribution, grain boundary, and effect of the electrode in the composites [37]. The data of electrical ac conductivity for the compounds can be evaluated from the four basic formulas [38] which are given as follows: The curve between the real part of impedance (Zʹ) with the frequency at various temperatures in the range of 200-275 ℃ is shown in Fig.…”

Aliovalent Calcium Substitution: An Effective Way to Enhance the Magnetoelectric Coupling Properties of Multiferroic BiFeO3

“…at the A‐site has been reported to enhance the magnetic and dielectric properties of BFO. [ 22,23 ] Also, the substitution imposes cationic off centering resulting in the rotation of the FeO 6 octahedra, leading to favorable FE properties. [ 24,25 ] BFO possess a distorted rhombohedral structure.…”

“…at the A-site has been reported to enhance the magnetic and dielectric properties of BFO. [22,23] Also, the substitution imposes cationic off centering resulting in the rotation of the FeO 6 octahedra, leading to favorable FE properties. [24,25] BFO possess a distorted rhombohedral DOI: 10.1002/pssa.202200445 Kinetics of magnetoelectric coupling in bismuth ferrite (BiFeO 3 ) with the substitution of aliovalent calcium ion is investigated.…”