Thermoelectric Properties of Si2Ti-Type Al-Mn-Si Alloys

By using the first principle band calculations, we identified that Si2Ti-type Al-Mn-Si C54-phase possesses an electronic structure suitable for the thermoelectric materials The formation range of the Al-Mn-Si C54-phase was determined by preparing samples at a number of different compositions. and the samples solely consisting of the C54-phase were successfully obtained around Al Mn Si = 1 1 1 The earlier concentration of the Al-Mn-Si C54-phase was controlled by the partial substitution of the constituent elements. and behaviors in electrical properties characteristic to n-type and p-type thermoelectric materials were alternatively observed for the samples of a target electron concentration and a smaller electron concentration. respectively The absolute vain of the Seebeck coefficient vertical bar S vertical bar was found to exceed 300 mu V/K for both n-type and p-type samples [doi 10.2320/matertrans.M2010022]