Intrinsic thermoelectric power of group VB metals | Zendy

Gunadhor Singh Okram | Zendy

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Intrinsic thermoelectric power of group VB metals

Author(s) -

Gunadhor Singh Okram

Publication year - 2012

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.3698169

Subject(s) - seebeck coefficient , crystallite , niobium , superconductivity , condensed matter physics , phonon drag , thermoelectric effect , fermi surface , electrical resistivity and conductivity , materials science , atmospheric temperature range , sign (mathematics) , chemistry , thermodynamics , metallurgy , physics , quantum mechanics , mathematical analysis , mathematics

We have reinvestigated the thermopower of group VB metals in polycrystalline forms in the temperature range of 6-300K, taking into account the critical nature of the sample surface and heat treatment especially for niobium. Strikingly small magnitude, negative sign, phonon drag dip and superconductivity not reported previously were observed in surface-cleaned single crystalline Nb. However, while thermopower magnitudes are small, mixed signs were found in the polycrystalline V, Nb and Ta samples. These properties were therefore interpreted as their intrinsic properties and were briefly discussed taking into account of the existing theory by fitting also the data that give the Fermi energies of 10.94 eV, 5.08 eV and 1.86eV, respectively

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