Browsing by Author "Weidenkaff, A"

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    Crystal growth and thermoelectric properties of CaMn0.98Nb0.02O3-delta
    (Elsevier Science B.V., 2013-08-15) Alfaruq, DS; Aguirre, MH; Otal, EH; Populoh, S; Karvonen, L; Yoon, S; Lu, Y; Deng, G; Ebbinghaus, SG; Weidenkaff, A
    Thermoelectric CaMn0.98Nb0.02O3-delta single crystals were grown from sintered polycrystalline material using the traveling-solvent floating zone (TSFZ) method. The floating-zone furnace was operated at over-pressure using an Ar/O-2 mixture to prevent evaporation during the growth process. Six twin-domain variants were detected with single-crystal X-ray diffraction (XRD) and confirmed by electron diffraction (ED) and high-resolution transmission electron microscopy (HRTEM). The Seebeck coefficient (S) of the single-crystalline material indicates n-type semiconducting behavior. Within 10 K < T < 125 K a negative peak in S is observed, known to be characteristic of antiferromagnetic ordering. The ferromagnetic long-range ordering, expected on the basis of double exchange between Mn4+ and doped Mn3+ species, thus appears to remain suppressed in the single-crystalline material. © 2013, Elsevier Ltd.