METHOD FOR QUICKLY MANUFACTURING N-TYPE MG3SB2-BASED MATERIAL HAVING HIGH THERMOELECTRIC PERFORMANCE

To provide a method for quickly manufacturing an n-type Mg3Sb2-based material having high thermoelectric performance.SOLUTION: An n-type Mg3Sb2-based thermoelectric material with high thermoelectric performance comprises an original composition of Mg3.2-xYxSb1.5Bi0.5-ySey, where x and y represent respective atomic percentages of x=0 to 0.1, and y=0 to 0.1, with prices of selected raw materials being low. The n-type Mg3Sb2- based thermoelectric material can be manufactured quickly and with high efficiency by a one-step ball-milling method, at low costs while saving energy. The material has: high reproducibility; excellent thermal stability; a lowest thermal conductivity value of 0.90 Wm-1K-1; a maximum power factor of 2451.70 μWm-1K-2 with 623K being a maximum value of the current system; and a maximum thermoelectric performance index of ZT=1.8 being one of maximum values of the current system. The material solves a problem existing in conventional temperature fusion and a two-step high energy ball-milling method that Mg elements volatilize, a solid phase reaction sealing tube condition is complex, and reaction takes a long time.SELECTED DRAWING: Figure 1 【課題】熱電性能が高いｎ型Ｍｇ3Ｓｂ2ベース材料を迅速に製造する方法を提供する。【解決手段】原料組成がＭｇ3.2-xＹxＳｂ1.5Ｂｉ0.5-yＳｅyであり、ｘ＝０～０．１、ｙ＝０～０．１、ｘ、ｙが原子パーセンテージを表し、選択された原料価格が低く、一段階ボールミル法により、ｎ型Ｍｇ3Ｓｂ2ベース熱電材料を迅速かつ高効率で、省エネルギで、低コストで製造することができ、該材料は、再現性が高く、熱安定性に優れ、０．９０Ｗｍ-1Ｋ-1の最低熱伝導率値を有し、６２３Ｋの時に２４５１．７０μＷｍ-1Ｋ-2の最高電力因子を有し、現在の該システムの最高値となり、最高熱電性能指数ＺＴ＝１．８であり、現在の該システムの最大値の１つとなり、従来の高温溶融と二段階高エネルギボールミル法におけるＭｇ元素が揮発し、固相反応封管条件が複雑で、製造過程と時間が長いという問題を解決する熱電性能が高いｎ型Ｍｇ3Ｓｂ2ベース熱電材料が提供される。【選択図】 図１