The Effect of Ba Doping on the Structural, Optical, Magnetic, and Dielectric Properties of BiFeO{sub 3} Nanoparticles

Journal Article · Sat Sep 15 04:00:00 EDT 2018 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/S10948-017-4483-9· OSTI ID:22773826

Manjula, N.; Kumar, K. Sunil; Ramanadha, M.; Rani, A. Sudha

Nanoparticles (Nps) of Ba (0, 1 to 5 at.%)-doped BiFeO{sub 3} were synthesized by a sol-gel route at 100 °C using tartaric acid as a chelating agent. The obtained results were studied by using XRD, SEM with EDAX, TEM, UV-vis diffusion reflectance spectra, VSM, and impedance analyzer. EDAX spectra confirmed the presence of Bi, Ba, and Fe in the samples. X-ray diffraction studies showed that BiFeO{sub 3} and Bi{sub 1−x}Ba{sub x}FeO{sub 3} samples exhibited the expected rhombohedral perovskite structure up to a Ba concentration of 3%, whereas 4 and 5% of Ba concentration exhibited the tetragonal phase. TEM studies indicate the particle sizes in the range of 08–28 nm. Reflectance spectra measurements showed a decrease in band gap with increasing Ba concentration. Magnetic properties indicated that the undoped BiFeO{sub 3} and Ba-doped BiFeO{sub 3} samples were ferromagnetic at room temperature. The dielectric constant (ε{sup ′}) and loss (ε{sup ″}) show large dispersion behavior. The dielectric constant increases with an increase of dopant concentration, but a very high value of the dielectric constant was noticed for x = 0.05.

• OSTI ID: 22773826
• Journal Information: Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 9 Vol. 31; ISSN 1557-1939
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM
BISMUTH COMPOUNDS
CHELATING AGENTS
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
DOPED MATERIALS
FERRITES
MAGNETIC PROPERTIES
NANOPARTICLES
OPTICAL PROPERTIES
PARTICLE SIZE
PEROVSKITE
SCANNING ELECTRON MICROSCOPY
SOL-GEL PROCESS
TARTARIC ACID
TRANSMISSION ELECTRON MICROSCOPY
TRIGONAL LATTICES
VIBRATING SAMPLE MAGNETOMETERS
X-RAY DIFFRACTION