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Electrical Resistivity in Non-stoichiometric MoO2

  • Condensed Matter
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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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Authors and Affiliations

  1. Escola de Engenharia de Lorena, Universidade de São Paulo, Lorena, SP, 12600-970, Brazil

    L. M. S. Alves, S. S. Benaion, C. M. Romanelli, C. A. M. dos Santos, M. S. da Luz, B. S. de Lima, F. S. Oliveira & A. J. S. Machado

  2. Instituto de Ciências Tecnológicas e Exatas, Universidade Federal do Triângulo Mineiro, Uberaba, MG, 38064-200, Brazil

    M. S. da Luz

  3. Departamento de Física, Universidade Federal do Paraná, Curitiba, PR, 81531-990, Brazil

    E. B. Guedes, M. Abbate & R. J. O. Mossanek

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  1. L. M. S. Alves
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  2. S. S. Benaion
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  3. C. M. Romanelli
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  4. C. A. M. dos Santos
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  5. M. S. da Luz
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  6. B. S. de Lima
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  7. F. S. Oliveira
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  8. A. J. S. Machado
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  9. E. B. Guedes
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  10. M. Abbate
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  11. R. J. O. Mossanek
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Correspondence to L. M. S. Alves.

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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

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