Open AccessPreparation and thermoelectric properties of Ti1－x(Hf0.919Zr0.081)xNiSn
Author(s) -
Haiqiang Liu,
Xinfeng Tang,
Kun Wang,
Song Chen,
Qingjie Zhang
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.2003
Subject(s) - materials science , thermoelectric effect , thermodynamics , physics
Single-phase Ti1-x(Hf0.919Zr0.081)xN iSn (x0.00—0.15) compounds were synthesized by solid-state reaction and high- density polycrystalline bulk material was prepared by spark plasma sintering (SP S). The effect of Hf and Zr substitution for Ti on the thermoelectric propertie s of TiNiSn half-Heusler compounds were investigated. It was shown that the subs titution of a small amount Hf and trace Zr for Ti resulted in significant reduct ion of the thermal conductivity and remarkable enhancement of the Seebeck coeff icient. As a result, the dimensionless figure of merit ZT of Ti0.85(H f0.919Zr0.081)0.15NiSn reached a high maximum v alue of 0.56 at 700K and the enhancement of ZT was 190%—310% at the same temper ature compared with ternary TiNiSn compounds.