کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
301008 512495 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermoelectric properties of a doped Mg2Sn system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
Thermoelectric properties of a doped Mg2Sn system
چکیده انگلیسی

Mg2X (X = Si, Sn) thermoelectric materials are promising materials for converting solar-thermal energy to electricity. To investigate the effects of non-stoichiometric compositions and Ag-doping on the thermoelectric properties of Mg2Sn, Mg2Sn thermoelectric materials were synthesized via vacuum melting and the spark plasma sintering (SPS) process. For all compositions with a ratio of Mg:Sn atoms between 67:33 and 71:29, we obtained nearly single-phase Mg2Sn with traces of a second phase. All samples showed the transition of a p- to n-type Seebeck coefficient; however, there were slight differences.To improve the p-type thermoelectric property, Ag atoms were doped into the Mg2Sn system. In the Sn-excess case (Mg:Sn = 67:33), the Seebeck coefficient maintained its p-type characteristic in the entire measured temperature range and the electrical conductivity increased due to the Ag-doping. As a result, the p-type power factor values for Ag-doped specimens increased by as much as 10 times compared to the value for the undoped case. This result could be important for developing p-type thermoelectric polycrystalline in the Mg2X(X = Si, Sn) system.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Renewable Energy - Volume 42, June 2012, Pages 23–27
نویسندگان
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