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- W2016135924 abstract "Crystals of a peritectic compound of CoSb3 were grown by the vertical Bridgman method. Changes in the growth parameters resulted in the formation of polycrystalline CoSb3 grains surrounded by Sb metal. In order to remove the excess Sb as-grown samples were annealed. Measurements of theses samples were made from room temperature to 873 K. Removing the residual Sb by post annealing brought about the formation of voids in the crystal (sponge-like structure), resulting in a increase in the Seebeck coefficient from 250 to 500 µV/K. Since the carrier concentration of the grown CoSb3 was of the order of 1E16 cm -3 , the observed values of the Seebeck coefficient were higher than that of single crystalline CoSb3 of a corresponding carrier concentration. However, the samples with much higher Seebeck coefficients had lower electrical conductivity. To improve this, metal was deposited on the surface of the post annealed samples. The temperature dependent thermoelectric properties for the postannealed samples showed that a slight decrease in Seebeck coefficient and a considerable increase in electrical conductivity were observed with increasing temperature over the temperature range from RT to 773K. The thermal conductivity obtained for the CoSb3 with a sponge-like structure was lower than that of bulk single crystal. The calculated dimensionless figure of merit, ZT, was 0.84 at 600 K for the metal-deposited sponge-like p-CoSb3." @default.
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- W2016135924 date "2005-01-01" @default.
- W2016135924 modified "2023-09-25" @default.
- W2016135924 title "Thermoelectric properties of p-type sponge-structure CoSb/sub 3/ prepared by melt growth and post annealing" @default.
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- W2016135924 doi "https://doi.org/10.1109/ict.2005.1519901" @default.
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