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Title: Crystal growth and thermoelectric properties of CaMn0.98Nb0.02O3-delta
Authors: Alfaruq, DS
Aguirre, MH
Otal, EH
Populoh, S
Karvonen, L
Yoon, S
Lu, Y
Deng, G
Ebbinghaus, SG
Weidenkaff, A
Keywords: Crystal growth
Magnetic properties
Issue Date: 15-Aug-2013
Publisher: Elsevier Science B.V.
Citation: Alfaruq, D. S., Aguirre, M. H., Otal, E. H., Populoh, S., Karvonen, L., Yoon, S., Lu, Y., Deng, G., Ebbinghaus, S. G., & Weidenkaff, A. (2013). Crystal growth and thermoelectric properties of CaMn0.98Nb0.02O3-delta. Journal of Crystal Growth, 377, 170-177. doi:10.1016/j.jcrysgro.2013.05.020
Abstract: 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.
Gov't Doc #: 5060
ISSN: 0022-0248
Appears in Collections:Journal Articles

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