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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| Language: | English |
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Elsevier
2018
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| Online Access: | http://psasir.upm.edu.my/id/eprint/72859/ http://psasir.upm.edu.my/id/eprint/72859/1/Grain%20size%20effect%20.pdf |
| _version_ | 1848857220104585216 |
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| author | Ng, Siau Wei Lim, Kean Pah Shaari, Abdul Halim Hassan, Jumiah |
| author_facet | Ng, Siau Wei Lim, Kean Pah Shaari, Abdul Halim Hassan, Jumiah |
| author_sort | Ng, Siau Wei |
| building | UPM Institutional Repository |
| collection | Online Access |
| 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). |
| first_indexed | 2025-11-15T11:54:05Z |
| format | Article |
| id | upm-72859 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T11:54:05Z |
| publishDate | 2018 |
| publisher | Elsevier |
| recordtype | eprints |
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| spelling | upm-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 |
| 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 |
| title | 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_short | 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 |
| url | http://psasir.upm.edu.my/id/eprint/72859/ http://psasir.upm.edu.my/id/eprint/72859/ http://psasir.upm.edu.my/id/eprint/72859/ http://psasir.upm.edu.my/id/eprint/72859/1/Grain%20size%20effect%20.pdf |