کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1605280 1516209 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Formation of Te-rich phase and its effect on microstructure and thermoelectric properties of hot-extruded Bi-Te-Se bulk materials
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Formation of Te-rich phase and its effect on microstructure and thermoelectric properties of hot-extruded Bi-Te-Se bulk materials
چکیده انگلیسی
A mechanical alloying (MA) and hot-extrusion technique was used to prepare n-type Bi-Te-Se bulk materials. The formation and distribution of Te-rich phase as well as its effect on microstructure and thermoelectric properties of the extruded samples have been investigated. The formation of Te-rich phase is mainly associated with sublimation of Te and eutectic reaction. The former occurs at any extrusion temperature and leads to formation of small-sized Te-rich phase, while the latter occurs at ≥400 °C and the resultant Te-rich phase possesses large sizes. The Te-rich phase was distributed in different morphologies depending on the extrusion temperature. Small-sized Te-rich phase was distributed around the grain boundaries in extruded samples. When excessive amount of Te was incorporated, the average grain size and orientation degree were found to be reduced due to formation of more Te-rich phase. Furthermore, the addition of excessive Te led to decrease of the Seebeck coefficient and increase of thermal conductivity, thus resulting in a significant reduction in ZT value.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 684, 5 November 2016, Pages 516-523
نویسندگان
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