Abstract
Ceramics with nominal BaFe12Ox composition were processed through laser floating zone technique from 25 to 200mm/h growth rates. These processing conditions were found to promote microstructural differences between the outer and inner parts of the rods, being more pronounced at higher growth rates. Along with the higher microstructural inhomogeneity, the samples grown at 100 and 200mm/h display reasonable n-type thermoelectric properties provided by BaFe18Ox phase formation. Their highest power factor measured at 800°C is comparable to the best observed so far in oxide ceramic materials, with additional advantage of high abundance and low costs of Fe2O3, and BaCO3 precursors.
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