A new class of materials with promising thermoelectric properties: MNiSn (M=Ti, Zr, Hf)
TiNiSn, ZrNiSn and HfNiSn are members of a large group of intermetallic compounds which crystallize in the cubic MgAgAs-type structure. Polycrystalline samples of these compounds have been prepared and investigated for their thermoelectric properties. With thermopowers of about {minus}200 {micro}V/K and resistivities of a few m{Omega}cm, power factors S{sup 2}/{rho} as high as 38 {micro}W/K{sup 2}cm were obtained at 700 K. These remarkably high power factors are, however, accompanied by a thermal conductivity, solid solutions Zr{sub 1{minus}x}Hf{sub x}NiSn, Zr{sub 1{minus}x}Ti{sub x}NiSn, and Hf{prime}{sub 1{minus}x}Ti{sub x}NiSn were formed. The figure of merit of Zr{sub 0.5}Hf{sub 0.5}NiSn at 700 K (ZT = 0.41) exceeds the end members ZrNiSn (ZT = 0.26) and HfNiSn (ZT = 0.22).
- Research Organization:
- Bell Labs., Murray Hill, NJ (US)
- OSTI ID:
- 20014246
- Resource Relation:
- Conference: 1997 Materials Research Society Spring Meeting, San Francisco, CA (US), 03/31/1997--04/03/1997; Other Information: Single article reprints are available through University Microfilms Inc., 300 North Zeeb Road, Ann Arbor, Michigan 48106; PBD: 1997; Related Information: In: Thermoelectric materials -- New directions and approaches. Materials Research Society symposium proceedings, Volume 478, by Tritt, T.M.; Kanatzidis, M.G.; Lyon, H.B. Jr.; Mahan, G.D. [eds.], 359 pages.
- Country of Publication:
- United States
- Language:
- English
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