Abstract
The higher boride compound YB22C2N has been reported as a promising n-type high-temperature thermoelectric material and possible counterpart to boron carbide. To investigate the influence of transition-metal additives on the thermoelectric properties of YB22C2N, a series of Rh, Co, Cu, and Ni samples were prepared. The resistivity and Seebeck coefficient of the samples were measured in the temperature range of 323 K to 1073 K. Samples with Rh and Co additives showed a considerable reduction of resistivity in comparison with pure YB22C2N and maintained their semiconducting properties at high temperatures. A sample with Co, obtained using long-term ball milling, showed the highest absolute value of Seebeck coefficient among all previously studied YB22C2N-based materials. Analyses of the influence of transition-metal additives and processing methods such as ball milling on the thermoelectric properties of YB22C2N are presented.
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