Abstract
MoO y with 1.85 ≤ y ≤ 2.20 has been studied by X-ray diffractometry and photoemission spectroscopy at room temperature and by electrical resistance as a function of temperature from 2 to 300 K. Although X-ray diffractograms are very similar to the stoichiometric MoO2 with monoclinic structure of the space group P21/c (14), the electrical properties are strongly dependent on the oxygen composition. Samples with y = 1.85 and 1.90 show anomalous behavior in electrical conductivity. Photoemission and X-ray absorption spectroscopy measurements suggest that this anomalous behavior is related to the presence of Mo3+ ions such as in KxMoO2 compound.
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Acknowledgments
This material is based upon work supported by the CNPq (508308/2010-0, 309084/2010-5, 448041/2014-6, 300821/2012-3, and 490182/2009-7) and FAPESP (2009/14524-6, 2009/54001-2, and 2010/06637-2); M.S. da Luz also thanks CAPES and FAPEMIG.
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Alves, L.M.S., Benaion, S.S., Romanelli, C.M. et al. Electrical Resistivity in Non-stoichiometric MoO2 . Braz J Phys 45, 234–237 (2015). https://doi.org/10.1007/s13538-015-0307-1
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DOI: https://doi.org/10.1007/s13538-015-0307-1