Abstract
Structural, dielectric, electric impedance and magnetic properties of TbMn1-xCoxO3 and TbMn1-xFexO3 (x = 0.1 and 0.2) nanoparticles (NPs) prepared by the sol-gel method have been studied. Room temperature x-ray diffraction (XRD) patterns reveal formation of the pure crystalline orthorhombic phase. Transmission electron microscopic images of doped samples show particles with average size of 30 nm. Temperature dependent dielectric curves of all samples exhibit an increment of dielectric constant and loss with increase in doping concentration. Frequency dependent impedance spectra and Cole-Cole plots of all samples corroborate the presence of grain and grain boundary relaxations and their temperature dependence follow the Arrhenius relation. Temperature dependent magnetization curve of each sample exhibits antiferromagnetic ordering of both Tb and Mn moments. Magnetic hysteresis loops (at 5 K) of all samples show reduction in magnetization value in the doped samples. Conversely, coercivity is found to increase after Co and Fe doping.
Original language | English |
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Pages (from-to) | 839-847 |
Number of pages | 9 |
Journal | Journal of Alloys and Compounds |
Volume | 778 |
DOIs | |
State | Published - 25 Mar 2019 |
Externally published | Yes |
Bibliographical note
Funding Information:The author, Anusree Das thanks University Grants Commission (UGC), New Delhi, India, for providing Senior Research Fellowship. Authors acknowledge Department of Science and technology (DST), India (Project no. IR/S2/PU-06/2006), for low temperature high magnetic field facility at UGC-DAE Consortium for Scientific Research, Kolkata Centre, India.
Funding Information:
The author, Anusree Das thanks University Grants Commission ( UGC ), New Delhi, India, for providing Senior Research Fellowship. Authors acknowledge Department of Science and technology ( DST ), India (Project no. IR/S2/PU-06/2006 ), for low temperature high magnetic field facility at UGC-DAE Consortium for Scientific Research , Kolkata Centre, India.
Publisher Copyright:
© 2018
Keywords
- Dielectric properties
- Manganites
- Nanoparticles