کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7995602 | 1516206 | 2016 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of Nb substitution on thermoelectric properties of CrSi2
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The effects of Nb substitution on the solubility range, lattice parameters, and thermoelectric properties of CrSi2 with a C40-type structure have been investigated. Polycrystalline samples of Nb-substituted Cr1âxNbxSi2 (0 â¤Â x â¤Â 0.15) have been prepared by a two-step arc-melting process, followed by spark plasma sintering. XRD patterns confirm that single-phase Cr1âxNbxSi2 is obtained in the composition range 0 â¤Â x â¤Â 0.10. As x increases from 0 to 0.10, the a- and c-axis lengths increase linearly. For x > 0.10, the a- and c-axis lengths do not obey Vegard's rule. The electrical conductivity of Cr1âxNbxSi2 (0 â¤Â x â¤Â 0.10) increases with increasing x, although the Seebeck coefficient gradually decreases with increasing x over the entire temperature range. In addition, the total thermal conductivity decreases with increasing x, owing to the reduction in lattice thermal conductivity. As a consequence, the dimensionless figure-of-merit ZTmax increases from 0.16 (x = 0) at 600 K to 0.20 (x = 0.05) at 700 K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 687, 5 December 2016, Pages 37-41
Journal: Journal of Alloys and Compounds - Volume 687, 5 December 2016, Pages 37-41
نویسندگان
Hiroki Nagai, Tomohisa Takamatsu, Yoshihiko Iijima, Kei Hayashi, Yuzuru Miyazaki,