کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5438450 | 1398184 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhanced thermoelectric properties and electronic structures of p-type BiCu1âxAgxSeO ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The thermoelectric properties and electronic structures were investigated on p-type BiCu1-xAgxSeO (x=0, 0.02, 0.05, 0.08) ceramics prepared using a two-step solid state reaction followed by inductively hot pressing. All the samples consist of single BiCuSeO phase with lamella structure and no preferential orientation exists in the crystallites. Upon replacing Cu+ by Ag+, maximum values of electrical conductivity of 36.6 S cmâ1 and Seebeck coefficient of 350 μV Kâ1 are obtained in BiCu0.98Ag0.02SeO and BiCu0.92Ag0.08SeO, respectively. Nevertheless, a maximum power factor of 3.67 μW cmâ1Kâ2 is achieved for BiCu0.95Ag0.05SeO at 750 K owing to the moderate electrical conductivity and Seebeck coefficient. Simultaneously, this oxyselenide exhibits a thermal conductivity as low as 0.38 W mâ1 Kâ1 and a high ZT value of 0.72 at 750 K, which is nearly 1.85 times as large as that of the pristine BiCuSeO. The enhancement of thermoelectric performance is mainly attributed to the increased density of states near the Fermi level as indicated by the calculated results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 8, 1 June 2017, Pages 6117-6123
Journal: Ceramics International - Volume 43, Issue 8, 1 June 2017, Pages 6117-6123
نویسندگان
Yazhou Sun, Cencen Zhang, Chengming Cao, Jianxin Fu, Liangming Peng,