کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10128825 | 1645147 | 2018 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrical resistivity modulation of thermoelectric iron based nanocomposites
ترجمه فارسی عنوان
مدولاسیون مقاومت الکتریکی از نانوکامپوزیت های بر پایه آهن ترموالکتریک
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کلمات کلیدی
ترموالکتریک، نانوکامپوزیت ها، پرتقال، تئوری کاربردی تراکم،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
چکیده انگلیسی
Iron oxides are promising thermoelectrics, but their high electrical resistivity impedes broader applications. In this work, we have studied Fe oxides with metallic contributions. Pt and Ir additions are also considered to enhance the valence electron concentration and further modify the transport properties. Based on density functional theory explorations, Fe based clusters (Fe3, Fe4, and Fe3Pt) are suggested to act as nucleation sites for metallic crystallites, while O leads to formation of an amorphous matrix. This has been validated by transmission electron microscopy and x-ray photoelectron spectroscopy of sputter-grown Fe-Pt-Ir-O thin films. Densely packed bcc Fe grains, approx. 2-3â¯nm in diameter, are embedded in an amorphous Fe-O matrix in the as-grown state. The Seebeck coefficient reaches even â411â¯Î¼Vâ¯Kâ1 and the electrical resistivity is up to 5 orders of magnitude lower than that of previously reported literature data on Fe oxides. We suggest that this peculiarity of our films is due to finite states localized at the Fermi level in these nanocomposites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 157, November 2018, Pages 384-390
Journal: Vacuum - Volume 157, November 2018, Pages 384-390
نویسندگان
Denis Music, Paul Schmidt, Zsolt Czigány, Grzegorz Greczynski, Richard W. Geyer, Marcus Hans,