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Ab initio study of phonon dispersion and thermodynamic properties of pure and doped pyrites

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Abstract

Pyrites (FeS2) are solid minerals that are found abundantly in Nigeria and are easy to prepare in laboratories. In this work, FeS2 is studied extensively in its pure state as well as when iron is substitutionally doped with zinc and calcium at concentrations of 0, 0.25, 0.5, 0.75 and 1. Using density functional theory, the eectronic, dynamic and thermodynamic properties were calculated. The results revealed that the lattice parameters and bulk modulus increases with increasing concentration and the obtained values are in agreement with available experimental and theoretical values. Though pyrite, when doped with zinc, obeys Vegard’s law, doping with calcium revealed pronounced deviation from this law. The calculated band structures showed that FeS2 has an indirect band gap whose size decreases after introducing zinc while doping with calcium increases the band gap. The phonon dispersion of the end members FeS2 and ZnS2 indicate that the systems are dynamically stable while CaS2 is dynamically unstate. Also, the thermodynamic properties of the pure and doped pyrites were calculated and the ranges of temperature at which the lattice and electronic degrees of freedom contribute to the specific heat capacity are presented.

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Authors and Affiliations

  1. Department of Physics, Federal University of Agriculture, PMB 2240, Abeokuta, Nigeria

    Abolore A. Musari, Joseph A. Olowofela & Gboyega A. Adebayo

  2. Physics with Electronics Unit, Moshood Abiola Polytechnic, PMB 2210, Abeokuta, Nigeria

    Abolore A. Musari

  3. National Institute for Theoretical Physics, Mandelstam Institute for Theoretical Physics, School of Physics University of Witwatersrand, Johannesburg, Wits, 2050, South Africa

    Daniel P. Joubert

  4. Department of Computer Science, Federal University of Agriculture, PMB 2240, Abeokuta, Nigeria

    Adio T. Akinwale

Authors
  1. Abolore A. Musari
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  4. Adio T. Akinwale
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Correspondence to Gboyega A. Adebayo.

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Musari, A.A., Joubert, D.P., Olowofela, J.A. et al. Ab initio study of phonon dispersion and thermodynamic properties of pure and doped pyrites. Eur. Phys. J. B 90, 254 (2017). https://doi.org/10.1140/epjb/e2017-80508-6

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  • DOI: https://doi.org/10.1140/epjb/e2017-80508-6

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