Crystal growth and thermoelectric properties of CaMn0.98Nb0.02O3−δ

• Published in: Journal of crystal growth 2013-08, Vol.377, p.170-177
• Main Authors: Alfaruq, D.S., Aguirre, M.H., Otal, E.H., Populoh, S., Karvonen, L., Yoon, S., Lu, Y., Deng, G., Ebbinghaus, S.G., Weidenkaff, A.
• Format: Article
• Language: English
• Subjects: A2. Calcium manganese oxide; A2. Single-crystal growth; A2. Thermoelectric properties; B1. Perovskites; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Conductivity phenomena in semiconductors and insulators; Convergent-beam electron diffraction, selected-area electron diffraction, nanodiffraction; Cross-disciplinary physics: materials science; rheology; Electron diffraction and scattering; Electronic transport in condensed matter; Exact sciences and technology; Growth from melts; zone melting and refining; Materials science; Methods of crystal growth; physics of crystal growth; Physics; Structure of solids and liquids; crystallography; Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation; Thermoelectric and thermomagnetic effects
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2013.05.020

Thermoelectric CaMn0.98Nb0.02O3−δ 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/O2 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 10K