Vijay Sharma - sol-gel synthesized ZnMnO

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  Publication Details (including relevant citation   information): Sharma, VK, Ojha, N, Varma, GD,   JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS,   2009, 70 (6), pp 941-947

  Abstract: In this paper we report the effect of   microstructural characteristics on the magnetic properties of   sol-gel synthesized Mn-doped ZnO. The microstructural   characteristics of the samples (e.g., grain sizes and their   distribution) have been varied by changing the sintering   temperature (T(S)) and sintering duration (T(H)). Weak room   temperature ferromagnetism (RTFM) has been observed in the   samples sintered for similar to 8h at 500, 600, 700, 800 and 900   degrees C. The ferromagnetic fraction and the saturation   magnetization, however, first increase as T(S) increases from 500   to 600 degrees C and after that both start decreasing. On the   other hand, the samples sintered for similar to 12h at the same   temperatures show paramagnetic behavior at room temperature.   Field emission scanning electron microscope (FESEM) results show   enhancement in the grain sizes with the increase in both T(S) and   T(H). Energy dispersive X-ray (EDAX) results show increase in the   oxygen content in the sample with increase in both T(S) and T(H).   X-ray diffractometer (XRD) measurements reveal that the basic   crystal structure of all the samples corresponds to the wurtzite   structure of pure ZnO together with some minor impurities. The   correlation between the observed magnetic properties and the   microstructural characteristics of the samples has been discussed   in this paper. (C) 2009 Elsevier Ltd. All rights reserved.

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