Zawawi, Rabiatul Adawiyah and Khairulzaman, Nurul Nasuha and Shamsuddin, Suhadir and Ibrahim, Norazila (2018) Comparative study on structural, electrical transport and magnetic properties of cr-doped in charge-ordered Pr0.75Na0.25Mn1-Xcrxo3 and Nd0.75Na0.25Mn1-Ycryo3 manganites. International Journal of Engineering and Technology, 7 (4.3). pp. 75-79. ISSN 2227-524X
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Cr doping in charge-ordered Pr0.75Na0.25Mn1-xCrxO3 and Nd0.75Na0.25Mn1-yCryO3 have been synthesized using conventional solid-state method to investigate its effect on structural, electrical transport and magnetic properties. X-ray diffraction (XRD) analysis for both compounds showed that the samples were crystallized in an orthorhombic structure with Pnma group. The unit cell volume value decrease as the Cr-doped increased indicating the possibility of Mn3+ ion was replaced by Cr3+ due to the different of ionic radius. The temperature dependence of electrical resistivity showed an insulating behavior down to the lower temperature the both parent compound (x = 0 and y = 0). Successive substitution of Cr at Mn-site in Pr0.75Na0.25Mn1-xCrxO3 manganites induced the metal-insulator (MI) transition temperature around TMI~120 K and TMI~122 K for x = 0.02 and x = 0.04 samples respectively suggestively due to the enhancement of double-exchange (DE) mechanism as a result of suppress the CO state. Analysis of resistivity data of dlnρ/dT-1 vs. T in Nd0.75Na0.25Mn1-yCryO3 manganite, showed a peak around 210 K and 160 K for y = 0 and 0.02 samples respectively while no peak was observed for y = 0.05 sample indicate the charge-ordered (CO) weakened. AC susceptibility, χ ’ measurements in Pr0.75Na0.25Mn1-xCrxO3 exhibits paramagnetic to ferromagnetic-like with curie temperature, TC increases from 132 K for x = 0.02 to 141 K for x = 0.04 with Cr content indicate the suppression of CO state meanwhile in Nd0.75Na0.25Mn1-yCryO3 showed paramagnetic to anti-ferromagnetic transition as Neel temperature TN increases from 115 K for y = 0.02 to 125 K for y = 0.05.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Charge-Ordered; Cr-Doped; Double-Exchange Mechanism; Electrical Transport; Magnetic Properties |
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Applied Science and Technology > Department of Physics and Chemistry |
| Depositing User: | UiTM Student Praktikal |
| Date Deposited: | 02 Dec 2021 03:50 |
| Last Modified: | 02 Dec 2021 03:50 |
| URI: | http://eprints.uthm.edu.my/id/eprint/4372 |
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