Influence of sintering temperature on the electrical and thermal properties of bulk samples of Pr2/3Sr1/3MnO3-δ

Bhatt, Ramesh Chandra and Daivajna, Mamatha D and Rao, Ashok and Shyam Prasad, K and Thomas, Riya and Nagaraja, B S and Awana, V P S and Lin, C F and Ramachandran, Balasubramanian and Kuo, Y K (2018) Influence of sintering temperature on the electrical and thermal properties of bulk samples of Pr2/3Sr1/3MnO3-δ. Physica B: Condensed Matter, 545 (1). pp. 141-145. ISSN 09214526

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Abstract

We present temperature-dependent studies on electrical and thermal properties of bulk samples of Pr2/3Sr1/ 3MnO3-δ synthesized at different sintering temperatures (TS). It is established that these properties intensely influenced by the sintering temperatures. Analysis of electrical resistivity data ρ(T) by means of standard models, demonstrated that electron-electron scattering processes play a key role in the conduction process in the lowtemperature region. At high temperatures, the ρ(T) follows the small polaron hopping (SPH) model. Analyses of the Seebeck coefficient data S(T) in the low temperature regime illustrates that electron-magnon scattering governs the thermoelectric transport, on contrary, the high-temperature S(T) follows the SPH model. The lowtemperature phonon peak in thermal conductivity κ(T) increases with increasing TS, demonstrating that a better crystallinity of Pr2/3Sr1/3MnO3 samples was obtained at higher sintering temperatures. Magnetic transitions are observed to increase with a higher TS, and the entropy change associated with the transition also increases with TS.

Item Type: Article
Uncontrolled Keywords: Manganites Sintering temperature Thermal conductivity Specific heat
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 22 Sep 2018 04:21
Last Modified: 22 Sep 2018 04:21
URI: http://eprints.manipal.edu/id/eprint/151998

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