HEUSLER TYPE IRON-BASED THERMOELECTRIC MATERIAL

• Main Authors: MINAMI KAZUKI, EZAKI JUNICHI
• Format: Patent
• Language: English; Japanese
• Published: 30.11.2017
• Subjects: ALLOYS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a Heusler type iron-based thermoelectric material which is improved in electrothermal characteristics by suppressing the rise in an electric resistivity ρ and lowering a thermal conductivity κ.SOLUTION: A thermoelectric material comprises: a base material having crystal grains including an FeVAl based Heusler compound represented by the formula (1) below; and Cu phases distributed in the crystal grains. (FeM1)(VM2)(AlM3)Formula(1), where M1 is at least one element selected from a group consisting of 3d, 4d, 5d transition metal elements (except Fe), M2 is at least one element selected from a group consisting of 3d, 4d, 5d transition metal elements (except V), M3 is at least one element selected from a group consisting of elements of Group IIIb (except Al), Group IVb (except C), Group Vb (except N); a≤0.2, b≤0.4, c≤0.4, |x|≤0.2, and |y|≤0.2.SELECTED DRAWING: None 【課題】電気抵抗率ρの上昇を抑えて熱伝導率κを低下させることで電熱特性を向上させたホイスラー型鉄系熱電材料を提供する。【解決手段】下記式(１)で表されるFe２ＶAl基ホイスラー化合物からなる結晶粒を有する母材と、前記結晶粒内に分散したＣｕ相と、からなる熱電材料である。（Fe１-ａＭ１ａ）２−ｘ−ｙ（Ｖ１−ｂＭ２ｂ）１＋ｘ（Al１−ｃＭ３ｃ）１＋ｙ・・・式(１)但し、Ｍ１は３ｄ，４ｄ，５ｄ遷移金属元素（Feを除く）からなる群から選ばれた１種以上の元素、Ｍ２は３ｄ，４ｄ，５ｄ遷移金属元素（Ｖを除く）からなる群から選ばれた１種以上の元素、Ｍ３はIIIｂ（Alを除く），IVb（但しＣを除く），Vb（但しＮを除く）族元素からなる群から選ばれた１種以上の元素で、ａ≦0.2，ｂ≦0.4，ｃ≦0.4，|ｘ|≦0.2，|ｙ|≦0.2である。【選択図】 なし