کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11006854 | 1511483 | 2018 | 29 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhanced thermoelectric performance in Ca-substituted Sr3SnO
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
First-principles calculations were performed to study the electronic and thermoelectric transport properties of Ca-substituted Sr3SnO (Sr3âxCaxSnO, 3â¯â¥â¯xâ¯â¥â¯0). The effects of Ca substitution on the bandgap are studied, and detailed mechanisms are proposed to explain the results obtained. We found that an increase of the hole concentration reduces the effective mass and the Seebeck coefficient of Ca-substituted Sr3SnO. The optimum hole concentration was obtained for Sr2CaSnO, and the corresponding maximum Seebeck coefficient of 219â¯Î¼V/K was obtained at 500â¯K. The electrical conductivity of Sr3SnO and its alloys has a semiconducting nature, which contradicts experimental results for Ca3SnO. We found that Ca-deficient Ca3SnO exhibits metallic conductivity, and this removes the contradiction with our results. The lattice thermal conductivities (κl) of Sr3SnO and Ca3SnO were calculated by use of both the Perdew-Burke-Ernzerhof functional and the GW functional. The total thermal conductivity for Sr3SnO and Ca3SnO at 300â¯K is 3.03 and 2.06â¯W/(m K), respectively. The figure of merit (ZT) for Sr2CaSnO at 500â¯K is 0.6, making it promising for thermoelectric applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 123, December 2018, Pages 318-326
Journal: Journal of Physics and Chemistry of Solids - Volume 123, December 2018, Pages 318-326
نویسندگان
Enamul Haque, M. Anwar Hossain,