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PROBLEM TO BE SOLVED : To provide an n-type thermoelectric conversion element utilizing rare-earth polyborides having a new function including n-type thermoelectric properties at high temperature (900 K or higher). SOLUTION : The problem is solved by providing triclinic or rhombohedral carbon- and nitrogen-doped rare-earth polyborides represented by general formula REB22+XC4+YN1+Z (-6
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