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Crystalline phase, surface morphology and electrical properties of monovalent doped Pr0.75Na0.25Mn1-yCoyO3 ceramics

Ab Mannan, Nurhabibah Nabilah and Shamsuddin, Suhadir and Noh, Mohamad Zaky and Mohamed, Zakiah (2018) Crystalline phase, surface morphology and electrical properties of monovalent doped Pr0.75Na0.25Mn1-yCoyO3 ceramics. International Journal of Current Science, Engineering & Technology, 1 (1). pp. 220-225. ISSN 25814311

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This paper reports effects of cobalt (Co) doped at Mn-site of Pr0.75Na0.25Mn1-yCoyO3 (y = 0, 0.02 and 0.05) on structure and electrical properties along with the surface morphology. All the samples were synthesized using standard solid state reaction method. Powder X-ray diffraction measurement shows that all samples were crystallized in an orthorhombic structure with Pnma space group. The unit cell volume was decreased suggestively due to the different ionic radius between Mn and Co as Co increases. Resistivity measurement shows that the y = 0 sample exhibits an insulating behavior down to lower temperature and interestingly the metal-insulator (MI) transition was found at 108 K and 84 K for y = 0.02 and y = 0.05 respectively. The shifting of the MI transition to lower temperature indicates a weakening of the double-exchange mechanism. On the other hand, scanning electron microscope (SEM) measurement showed that a different surface morphology was observed for all samples. A different pattern of grain boundaries was observed with increasing of Co content. Grains connection of y = 0 samples was observed slightly denser compare to the y = 0.02 and 0.05 samples in conjunction with incerasing of the value of porosity. This can be suggested due to the successful of doping of Co ions in the compound.

Item Type: Article
Uncontrolled Keywords: X-ray diffraction; scanning electron microscope; double-exchange mechanism
Subjects: T Technology > TP Chemical technology > TP785-869 Clay industries. Ceramics. Glass
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 15 Jan 2019 08:48
Last Modified: 15 Jan 2019 08:48
URI: http://eprints.uthm.edu.my/id/eprint/10515
Statistic Details: View Download Statistic

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