Abstract
Sn1−x Sr x O2 nanoparticles (NPs) were synthesized by the sol–gel method in the present work. X-ray diffraction analyses reveal that Sr atoms are incorporated into the SnO2 NPs without forming secondary phase with Sr concentration up to 5 at.%. The room temperature photoluminescence measurements indicate that Sr doping increases the number of singly charged oxygen vacancies (V +O ) in SnO2 NPs due to the different ionic radii of Sr2+ and Sn4+. Both pure and Sr-doped SnO2 NPs are ferromagnetic and the largest saturation magnetization of 6.98 × 10−4 emu/g has been observed in Sn0.95Sr0.05O2 NPs which has the largest concentration of V +O defects. The correlation between the induced V +O defects and the enhanced ferromagnetism implies that the observed ferromagnetic ordering in Sn1−x Sr x O2 NPs is connected with V +O defects. Meanwhile, air-annealing of the samples resulting in a significant suppression of the ferromagnetism further supports this point.
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This work was supported by the National Natural Science Foundation of China (51074112).
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Wang, N., Zhou, W., Liang, Y. et al. Oxygen vacancy-mediated room temperature ferromagnetism in Sr-doped SnO2 nanoparticles. J Mater Sci: Mater Electron 26, 7751–7756 (2015). https://doi.org/10.1007/s10854-015-3420-6
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DOI: https://doi.org/10.1007/s10854-015-3420-6