کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9804103 | 1516478 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermoelectric properties of the TiX(Zr0.5Hf0.5)1 â XNiSn half-Heusler compounds
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The effect of Ti substitution on the thermoelectric properties of (Zr, Hf)NiSn half-Heusler compounds, TiX(Zr0.5Hf0.5)1 â XNiSn (X = 0-0.7), is reported. The sintered polycrystalline samples were obtained by hot-pressing the milled powder after arc melting. It was shown that the substitution of Ti for (Zr, Hf) resulted in a significant reduction of the thermal conductivity to as low as 3.1 Wmâ1 Kâ1 at room temperature. We also found that the Seebeck coefficient was enhanced remarkably by Ti substitution. Furthermore, the doping with Sb for the Sn sites in (Ti, Zr, Hf)NiSn led to reduction in electric resistivity and, accordingly, to enhancement of the power factor. In the Sb doped (Ti, Zr, Hf)NiSn compounds, Ti0.5(Zr0.5Hf0.5)0.5NiSn0.998Sb0.002, the dimensionless figure of merit, ZT, increased with increasing temperature, showing its maximum value of 1.5 at 700 K. In view of their potential, these materials are of interest in regard to thermoelectric power generation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 389, Issues 1â2, 8 March 2005, Pages 204-208
Journal: Journal of Alloys and Compounds - Volume 389, Issues 1â2, 8 March 2005, Pages 204-208
نویسندگان
Naoki Shutoh, Shinya Sakurada,