Enhanced ferromagnetic properties and high temperature dielectric anomalies in Bi0.9Ca0.05Sm0.05FeO3 prepared by hydrothermal method

Bharathi, K. Kamala, Ramesh, G., Patro, L. N., Raju, N. Ravi C. and Kim, D. K. (2014) Enhanced ferromagnetic properties and high temperature dielectric anomalies in Bi0.9Ca0.05Sm0.05FeO3 prepared by hydrothermal method. Materials Research Bulletin, 62 5-10. doi:10.1016/j.materresbull.2014.11.017


Author Bharathi, K. Kamala
Ramesh, G.
Patro, L. N.
Raju, N. Ravi C.
Kim, D. K.
Title Enhanced ferromagnetic properties and high temperature dielectric anomalies in Bi0.9Ca0.05Sm0.05FeO3 prepared by hydrothermal method
Formatted title
Enhanced ferromagnetic properties and high temperature dielectric anomalies in Bi0.9Ca0.05Sm0.05FeO3 prepared by hydrothermal method
Journal name Materials Research Bulletin   Check publisher's open access policy
ISSN 0025-5408
1873-4227
Publication date 2014-02-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.materresbull.2014.11.017
Volume 62
Start page 5
End page 10
Total pages 6
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2015
Language eng
Formatted abstract
Enhanced ferromagnetic properties and high temperature dielectric anomalies in the temperature range of 300–873 K in Bi0.9Ca0.05Sm0.05FeO3 (BCSFO) prepared by hydrothermal method are reported. BiFeO3 is seen to crystallize in rhombohedrally distorted perovskite structure without any impurity phase. Substitution of small amount of Ca and Sm (Bi0.9Ca0.05Sm0.05FeO3) leads to increase in the lattice constant values and formation of small amount of secondary phase. Magnetization curve of pure BFO indicates very weak ferromagnetism combined with antiferromagnetic nature of the samples. Whereas, BCSFO sample shows very clear and enhanced ferromagnetic nature. Saturation magnetization and Neel’s temperature values are found to be 4.36 emu/g and 664 K, respectively. X-ray photoelectron spectroscopy indicates the creation of oxygen vacancies upon Ca substitution in Bi site. Dielectric anomalies at 420 and 540 K were observed for Bi0.9Ca0.05Sm0.05FeO3 from the temperature variation of dielectric constant and specific heat capacity measurements. Observation of dielectric anomalies in pure BiFeO3 sample reveals that the origin of dielectric peaks is purely from the primary phase. Raman spectroscopy study indicates a clear shift and broadening of A modes (between 100 and 200 cm−1) at the dielectric anomaly temperatures supporting the observed dielectric anomalies.
Keyword Bismuth ferrite
Oxygen vacancy
Ferromagnetism
X-ray photoelectron spectroscopy
Raman spectroscopy
Dielectric anomaly
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Chemistry and Molecular Biosciences
 
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