کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10620524 988634 2012 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Formation of ordered nano-wire microstructures in thermoelectric Pb-Ag-Sb-Te
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Formation of ordered nano-wire microstructures in thermoelectric Pb-Ag-Sb-Te
چکیده انگلیسی
Regular arrays of nano-wire microstructures containing Ag2Te rods with diameter <400 nm and inter-rod distance <1 μm are formed in a matrix of AgSbTe2 + δ-Sb2Te, which makes an ordered nano-wire composite thermoelectric material. This microstructure is formed during eutectic solidification processing. To understand and guide production of uniform bulk samples of this composite, the liquidus projection of quaternary Pb-Ag-Sb-Te system at 36.0 at.% Te isoplethal section is constructed experimentally, using quenched samples. A three-phase univariant reaction of the quaternary Pb-Ag-Sb-Te system, L → AgSbTe2 + Ag2Te + δ-Sb2Te, is investigated, between a ternary-eutectic melt (Ag-40.0 at.% Sb-36.0 at.% Te) and a quaternary melt (Pb-22.0 at.% Ag-40.0 at.% Sb-36.0 at.% Te), at 496.1 °C and 503.9 °C, respectively. High-resolution transmission electron microscopy confirms that these three phases are simultaneously present at the nanometer scale. Furthermore, unidirectional solidification experiments of the ternary eutectic alloy using the Bridgman method are carried out to examine the alloy's solidification behavior.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 60, Issue 3, February 2012, Pages 1129-1138
نویسندگان
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