کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5440424 | 1398229 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Porous Ca3Co4O9 with enhanced thermoelectric properties derived from Sol-Gel synthesis
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Porous Ca3Co4O9 with enhanced thermoelectric properties derived from Sol-Gel synthesis Porous Ca3Co4O9 with enhanced thermoelectric properties derived from Sol-Gel synthesis](/preview/png/5440424.png)
چکیده انگلیسی
Highly porous Ca3Co4O9 thermoelectric oxide ceramics for high-temperature application were fabricated by sol-gel synthesis and subsequent conventional sintering. Growth mechanism of misfit-layered Ca3Co4O9 phase, from sol-gel synthesis educts and upcoming intermediates, was characterized by in-situ X-ray diffraction, scanning electron microscopy and transmission electron microscopy investigations. The Ca3Co4O9 ceramic exhibits a relative density of 67.7%. Thermoelectric properties were measured from 373 K to 1073 K. At 1073 K a power factor of 2.46 μW cmâ1 Kâ2, a very low heat conductivity of 0.63 W mâ1 Kâ1 and entropy conductivity of 0.61 mW mâ1 Kâ2 were achieved. The maintained figure of merit ZT of 0.4 from sol-gel synthesized Ca3Co4O9 is the highest obtained from conventional, non-doped Ca3Co4O9. The high porosity and consequently reduced thermal conductivity leads to a high ZT value.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 37, Issue 13, October 2017, Pages 3909-3915
Journal: Journal of the European Ceramic Society - Volume 37, Issue 13, October 2017, Pages 3909-3915
نویسندگان
Michael Bittner, Lailah Helmich, Frederik Nietschke, Benjamin Geppert, Oliver Oeckler, Armin Feldhoff,