Size-manipulat ion, compacti on and electrical properties of barium manganite nanorods synthesized via the
CHM method |
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Authors: | Khizar Hayat MA Rafiq Atta ur Rahman Abid Ali Khan and MM Hasan |
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Institution: | Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Khyber Pakhtunkhwa 25120, Pakistan Micro and Nano Devices Group, Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied
Sciences, P.O. Nilore, Islamabad 45650, Pakistan
Academy of Sciences, Fuzhou 350002, China;Micro and Nano Devices Group, Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied
Sciences, P.O. Nilore, Islamabad 45650, Pakistan
Academy of Sciences, Fuzhou 350002, China;Micro and Nano Devices Group, Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied
Sciences, P.O. Nilore, Islamabad 45650, Pakistan
Academy of Sciences, Fuzhou 350003, China;Centre of Biotechnology & Microbiology, University of Peshawar, Khyber Pakhtunkhwa 25120, Pakistan
Academy of Sciences, Fuzhou 350002, China;Micro and Nano Devices Group, Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied
Sciences, P.O. Nilore, Islamabad 45650, Pakistan |
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Abstract: | A composite-hydroxide mediated method was employed to synthesize barium manganite nanorods. Diameter, surface smoothness and uniformity of these nanorods were optimized by varying reaction temperature and reaction time. The rods with an average diameter of 200 nm and length of 1–1.5 μm were obtained at optimum conditions of 200 °C/48 h. The dielectric study of these rods reveals that they have higher value of dielectric constant at lower frequencies which was attributed to the interfacial and rotational type polarizations. Similarly, the increase in dielectric constant with temperature was attributed to the thermal activation of such polarizations. Furthermore, the analysis of ln(J) vs. E1/2 characteristics in the temperature range of 300–400 K shows that possible operative conduction mechanism was of Poole–Frenkel type. The value of βexp was found to be 4.85 times greater than the expected theoretical value of field lowering coefficient with an internal field enhancement factor of α2=23.5. This high value of βexp may be due to some localized electric fields existing inside the sample. |
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Keywords: | BaMnO3
nanorods Electrical properties Dielectric properties DC conduction
mechanism |
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