Ab Mannan, Nurhabibah Nabilah and Razali, Sufia Aqilah and Shamsuddin, Suhadir and Noh, Mohamad Zaky and Mohamed, Zakiah (2018) Effect of Co3+ substitution on electro-magnetic properties of Pr0.75Na0.25mno3 and Nd0.75Na0.25mno3 manganites. International Journal of Engineering and Technology, 7 (4.3). pp. 389-392. ISSN 2227-524X
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This paper reports influences of cobalt (Co) substituted at Mn-site of Pr0.75Na0.25Mn1-xCoxO3 and Nd0.75Na0.25Mn1-yCoyO3 on structure, electrical transport and magnetic properties. All of the samples were prepared via standard solid state reaction method. X-ray diffraction measurement indicates that all samples were crystallized in an orthorhombic structure (space group Pnma). Resistivity measurement displays the x = 0 sample manifests an insulator behavior while metal-insulator transition was found at 108 K and 84 K for x = 0.02 and 0.05 respectively for Pr0.75Na0.25Mn1-xCoxO3. On the other hand, all of the samples for Nd0.75Na0.25Mn1-yCoyO3 showed insulator behavior down to low temperature and analysis of the resistivity change with respect to temperature, dlnρ/dT -1 versus T reveals a slope changes of resistivity have been recorded. Two obvious peaks were recorded from the analysis for y = 0.02 and 0.05 which can be suggested to the existence of charge order transition at the vicinity. For magnetic properties, x = 0 sample showed a paramagnetic-antiferromagnetic transition and further substitution of Co, x = 0.02 and 0.05, induce the paramagnetic-ferromagnetic transition and antiferromagnetic arrangement respectively. Meanwhile, further substitution of Co, y = 0.02 and 0.05 indicate antiferromagnetic transition with increasing TN as Co increased.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Charge Ordered; Double Exchange Mechanism; Manganites |
| Subjects: | T Technology > TP Chemical technology > TP155-156 Chemical engineering |
| Divisions: | Faculty of Applied Science and Technology > Department of Physics and Chemistry |
| Depositing User: | UiTM Student Praktikal |
| Date Deposited: | 02 Dec 2021 03:34 |
| Last Modified: | 02 Dec 2021 03:34 |
| URI: | http://eprints.uthm.edu.my/id/eprint/4328 |
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