| 3 | Synthesis and Room Temperature d^o Ferromagnetic Properties of α-MoO_3 Nanofibers显示文摘Herein,we report the magnetic properties of α-MoO_3 nanofibers synthesized via a hydrothermal method.X-ray photoelectron and Raman spectroscopic studies have been employed to evidence the presence of oxygen vacancy defects in the α-MoO_3 nanofibers.To elucidate the oxygen vacancy related ferromagnetism,post-thermal annealing in oxygen and vacuum was performed.The UV emission band of α-MoO_3 nanofibers reveals a red shift from oxygen annealed to vacuum annealed,indicating a bandedge reduction.The saturation magnetization of oxygen annealed nanofibers decreases while that of vacuum annealed nanofibers increases.These results strongly confirm that the oxygen vacancies play a significant role in inducing ferromagnetism.The origin of ferromagnetism may be due to the exchange interactions among localized electron spin moments resulting from oxygen vacancies of α-MoO_3 nanofibers.The presence of such defects was further supported by the photoluminescence measurements. | Sandeep K.S.Patel Khemchand Dewangan N.S.Gajbhiye | 2015 | Journal of Materials Science & Technology2015，31，5： | 0 |
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