| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a thermoelectric material with a large dimensionless performance index and thus facilitate the manufacturing method. <P>SOLUTION: A thermoelectric material comprises a Mg<SB POS="POST">2</SB>Si group compound of the chemical formula Mg<SB POS="POST">2-x-y-z</SB>Al<SB POS="POST">x</SB>Zn<SB POS="POST">y</SB>Mn<SB POS="POST">z</SB>Si in which x≠0, y≠0, z≠0, 0.04≤y/x≤0.6 and 0.013≤z/x≤0.075, where the total added amount of Al, Zn and Mn is 0.3at% or more and 5at% or less. Mg<SB POS="POST">2-x-y-z</SB>Al<SB POS="POST">x</SB>Zn<SB POS="POST">y</SB>Mn<SB POS="POST">z</SB>is imparted as an Mg alloy. The Mg alloy and Si powder are mixed so that the atomic ratio of the Mg alloy and the Si is 2:1; the Mg alloy and the Si are subjected to synthesis reaction using a liquid phase-solid phase reaction method, in an inert gas atmosphere at a temperature of a melting-point or higher of the Mg alloy, in solid-liquid coexistence state of the Mg alloy in liquid-phase state and the Si in solid-phase state; by cooling after completion of the reaction, a porous Mg<SB POS="POST">2</SB>Si group compound is produced; the Mg<SB POS="POST">2</SB>Si group compound is pulverized in an inert gas atmosphere to form a pulverized body; and then the pulverized body is subjected to pressure sintering under vacuum or an inert atmosphere. <P>COPYRIGHT: (C)2012,JPO&INPIT |
