Development of Thermoelectric Materials using Weakly Bonded Rigid Heavy Clusters

在AlPdRe和AlPdMn准晶体中，我们根据WBRHC（弱键刚性重团簇）的新指导原则改进了微观结构并取代了组成元素。结果表明，用Fe代替Re后准晶的无因次优值ZT增大2.6倍，达到0.21；用Ga代替Al后准晶的无因次优值ZT增大1.4倍，达到最大值0.26。另一方面，在被认为是Al基准晶体的相关材料Al_2Ru中，我们通过用较重的Ga代替Al并降低导热系数，成功地将ZT提高到0.5。

In AlPdRe and AlPdMn quasicrystals, we improved the microstructure and substituted the constitution elements according to our new guiding principle of WBRHC (weakly bonded rigid heavy clusters). We succeeded that the dimensionless figure of merit, ZT, increases 2.6 times to 0,21 by the substitution of Fe for Re in the former and 1.4 times to the largest value of 0.26 for the quaqsicrystals by the substitution of Ga for Al in the latter. On the other hand, in Al_2Ru which has been considered to be a related material for the Al-based quasicrystals, we succeeded to improve ZT to be 0.5 by substituting heavier Ga for Al and decreasing the thermal conductivity.