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Grain size effect on the electrical and magneto-transport properties of nanosized Pr0.67Sr0.33MnO3

In this study, nanosized of Pr0.67Sr0.33MnO3 prepared via sol-gel method followed by heat treatment at 600–1000 °C in intervals of 100 °C were synthesized. The structure, surface morphology, electrical, magneto-transport and magnetic properties of the samples were investigated. Rietveld refinements...

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Main Authors: Ng, Siau Wei, Lim, Kean Pah, Shaari, Abdul Halim, Hassan, Jumiah
Format: Article
Language:English
Published: Elsevier 2018
Online Access:http://psasir.upm.edu.my/id/eprint/72859/1/Grain%20size%20effect%20.pdf
http://psasir.upm.edu.my/id/eprint/72859/
https://www.sciencedirect.com/science/article/pii/S2211379717319435
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spelling my.upm.eprints.728592021-03-25T21:40:13Z http://psasir.upm.edu.my/id/eprint/72859/ Grain size effect on the electrical and magneto-transport properties of nanosized Pr0.67Sr0.33MnO3 Ng, Siau Wei Lim, Kean Pah Shaari, Abdul Halim Hassan, Jumiah In this study, nanosized of Pr0.67Sr0.33MnO3 prepared via sol-gel method followed by heat treatment at 600–1000 °C in intervals of 100 °C were synthesized. The structure, surface morphology, electrical, magneto-transport and magnetic properties of the samples were investigated. Rietveld refinements of X-ray diffraction patterns confirm that single phase orthorhombic crystal structure with the space group of Pnma (62) is formed at 600 °C. A strong dependence of surface morphology, electrical and magneto-transport properties on grain size have been observed in this manganites system. Both grain size and crystallite size are increases with the sintering temperature due to the congregation effect. Upon increasing grain size, the paramagnetic-ferromagnetic transition temperature increases from 278 K to 295 K. The resistivity drops and the metal-insulator transition temperature shifted from 184 K to 248 K with increases of grain size due to the grain growth and reduction of grain boundary. Below metal-insulator transition temperature, the samples fit well to the combination of resistivity due to grain or domain boundaries, electron-electron scattering process and electron-phonon interaction. The resistivity data above the metal-insulator transition temperature is well described using small polaron hopping and variable range hopping models. It is found that the negative magnetoresistance also increases with larger grain size where the highest %MR of – 26% can be observed for sample sintered at 1000 °C (245 nm). Elsevier 2018-06 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/72859/1/Grain%20size%20effect%20.pdf Ng, Siau Wei and Lim, Kean Pah and Shaari, Abdul Halim and Hassan, Jumiah (2018) Grain size effect on the electrical and magneto-transport properties of nanosized Pr0.67Sr0.33MnO3. Results in Physics, 9. 1192 - 1200. ISSN 2211-3797 https://www.sciencedirect.com/science/article/pii/S2211379717319435 10.1016/j.rinp.2018.04.032
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description In this study, nanosized of Pr0.67Sr0.33MnO3 prepared via sol-gel method followed by heat treatment at 600–1000 °C in intervals of 100 °C were synthesized. The structure, surface morphology, electrical, magneto-transport and magnetic properties of the samples were investigated. Rietveld refinements of X-ray diffraction patterns confirm that single phase orthorhombic crystal structure with the space group of Pnma (62) is formed at 600 °C. A strong dependence of surface morphology, electrical and magneto-transport properties on grain size have been observed in this manganites system. Both grain size and crystallite size are increases with the sintering temperature due to the congregation effect. Upon increasing grain size, the paramagnetic-ferromagnetic transition temperature increases from 278 K to 295 K. The resistivity drops and the metal-insulator transition temperature shifted from 184 K to 248 K with increases of grain size due to the grain growth and reduction of grain boundary. Below metal-insulator transition temperature, the samples fit well to the combination of resistivity due to grain or domain boundaries, electron-electron scattering process and electron-phonon interaction. The resistivity data above the metal-insulator transition temperature is well described using small polaron hopping and variable range hopping models. It is found that the negative magnetoresistance also increases with larger grain size where the highest %MR of – 26% can be observed for sample sintered at 1000 °C (245 nm).
format Article
author Ng, Siau Wei
Lim, Kean Pah
Shaari, Abdul Halim
Hassan, Jumiah
spellingShingle Ng, Siau Wei
Lim, Kean Pah
Shaari, Abdul Halim
Hassan, Jumiah
Grain size effect on the electrical and magneto-transport properties of nanosized Pr0.67Sr0.33MnO3
author_facet Ng, Siau Wei
Lim, Kean Pah
Shaari, Abdul Halim
Hassan, Jumiah
author_sort Ng, Siau Wei
title Grain size effect on the electrical and magneto-transport properties of nanosized Pr0.67Sr0.33MnO3
title_short Grain size effect on the electrical and magneto-transport properties of nanosized Pr0.67Sr0.33MnO3
title_full Grain size effect on the electrical and magneto-transport properties of nanosized Pr0.67Sr0.33MnO3
title_fullStr Grain size effect on the electrical and magneto-transport properties of nanosized Pr0.67Sr0.33MnO3
title_full_unstemmed Grain size effect on the electrical and magneto-transport properties of nanosized Pr0.67Sr0.33MnO3
title_sort grain size effect on the electrical and magneto-transport properties of nanosized pr0.67sr0.33mno3
publisher Elsevier
publishDate 2018
url http://psasir.upm.edu.my/id/eprint/72859/1/Grain%20size%20effect%20.pdf
http://psasir.upm.edu.my/id/eprint/72859/
https://www.sciencedirect.com/science/article/pii/S2211379717319435
_version_ 1695532767007211520
score 13.211869

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