Crystal growth and thermoelectric properties of CaMn0.98Nb 0.02O3-δ

DIMAS S. ALFARUQ; MYRIAM H. AGUIRRE; EUGENIO HERNÁN OTAL; SASCHA POPULOH; LASSI KARVONEN; SONGHAK YOON; LU YE; GUOCHU DENG; STEFAN EBBINGHAUS

JOURNAL OF CRYSTAL GROWTH

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2013 vol. 377 p. 170 - 177

0022-0248

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 10 K