Effect of Rare Earth Ionic Radii on Structural, Electric, Magnetic and Thermoelectric Properties of REMnO3 (RE =Dy, Gd, Eu and Sm)Manganites

Nagaraja, B S and Rao, Ashok and Poornesh, P and Okram, G S (2018) Effect of Rare Earth Ionic Radii on Structural, Electric, Magnetic and Thermoelectric Properties of REMnO3 (RE =Dy, Gd, Eu and Sm)Manganites. Journal of Superconductivity and Novel Magnetism, 31 (01). pp. 2271-2281. ISSN 1557-1939

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Abstract

In this communication, we present a systematic investigation on structural, electric, magnetic and thermoelectric power properties of REMnO3 (RE = Dy, Gd, Eu and Sm) manganites which were prepared using solid-state reaction route. The samples exhibit orthorhombic crystal structure with Pbnm space group. Rietveld analysis of x-ray diffraction (XRD) data shows that the unit cell volume increases with increase in ionic radii of the rare earth ion, rRE. The particle size was calculated from the scanning electron microscope (SEM) images. The estimated particle size is observed to decrease with increasing ionic radii of the rare earth ions. All samples exhibit insulating behaviour and display immeasurably high resistivity at low temperatures. Magnetization studies indicate that the samples display a transition in the low temperature region. Magnetization data also reveals that antiferromagnetic behaviour is observed for all samples. Thermoelectric power results show that large thermoelectric power is seen for these manganites. Thermoelectric power of high-temperature region was successfully analysed using small polaron hopping (SPH) model.

Item Type: Article
Uncontrolled Keywords: Manganites · Rietveld refinement · Magnetization · Thermoelectric power
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 06 Jul 2018 09:22
Last Modified: 06 Jul 2018 09:22
URI: http://eprints.manipal.edu/id/eprint/151496

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