Grain structure and thermal transport properties of TiNiSn1-xSbx and Ti1-yZryNiSn0.95Sb0.05 half-Heusler alloys

被引：3

作者：

Bhattacharya, S ^{[1
]}

Skove, MJ ^{[1
]}

Russell, M ^{[1
]}

Tritt, TM ^{[1
]}

Xia, Y ^{[1
]}

Ponnambalam, V ^{[1
]}

Poon, SJ ^{[1
]}

Thadhani, N ^{[1
]}

机构：

[1] Clemson Univ, Clemson, SC 29631 USA

来源：

ICT: 2005 24th International Conference on Thermoelectrics | 2005年

关键词：

D O I：

10.1109/ICT.2005.1519957

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Thermal conductivity of two series of Ti-based half-Heusler alloys have been investigated and compared. A significant reduction in the lattice thermal conductivity (kappa(L)) in Ti1-yZryNiSn0.95Sb0.05 via mass fluctuation scattering (y > 20%) is observed. However, small amounts of Sb (x <= 5%) in TiNiSn1-xSbx do not yield similar results. A non-systematic increase in kappa(L) in the TiNiSn1-xSbx series was observed, even with the minute amounts (x <= 5%) of Sb-doping. Extensive investigations of the grain structure in these materials show that there is a direct correlation between kappa(L) and the average grain size in these materials. These results are in good agreement with the theoretical predictions of Goldsmid et al. [1] Theoretical calculations relating to the phonon mean free path in both the series of compounds would also be presented and discussed.

引用

页码：343 / 347

页数：5

共 19 条

[1] NARROW-BAND IN THE INTERMETALLIC COMPOUNDS TINISN, ZRNISN, HFNISN [J].