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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >The effect of Cr substitution on the structure and properties of misfit-layered Ca_3Co_(4_x)Cr_xO_(9+δ) thermoelectric oxides
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The effect of Cr substitution on the structure and properties of misfit-layered Ca_3Co_(4_x)Cr_xO_(9+δ) thermoelectric oxides

机译：Cr取代对错配层Ca_3Co_（4_x）CR_O_（9 +δ）热电氧化物的结构和性能的影响

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摘要

Misfit-layered Ca_3Co_(4_x)Cr_xO_(9+δ) (0 < x ^ 0.2) powders were synthesized by a simple thermal hydro-decomposition method and then fabricated to form highly dense ceramics using spark plasma sintering. X-ray diffraction, and a field emission scanning electron microscope equipped with an energy dispersive X-ray spectrometer were used to verify the single phase of Ca_3Co_4Cr_xO_(9+δ) for the samples with x = 0, 0.05, 0.10 and 0.15. The characteristic plate-like grain structure was observed. The chemical composition of the fabricated samples was found to be close to nominal composition. The thermoelectric measurement showed that Cr doping has an influence on the thermoelectric properties. The resistivity and the Seebeck coefficient increased while the thermal conductivity was suppressed when Cr was added into the system. Explanation of the change in thermoelectric properties was discussed regarding the difference in the charge states and the ionic radii between Co and Cr ions. The highest ZT of 0.19 at 1073 K was obtained for the Ca_3Co_(4_x)Cr_xO_(9+δ) sample. In addition, the paramagnetic property was observed in all samples at room temperature.
机译：通过简单的热水 - 分解方法合成了耗尽层CA_3CO_（4_X）CR_XO_（9 +δ）（0

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