کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5435704 1398119 2018 8 صفحه PDF ندارد دانلود رایگان
عنوان انگلیسی مقاله
On the characterisation of antisite defects and ordering in off-stoichiometric Fe2VAl-based Heusler compounds by X-ray anomalous diffraction
کلمات کلیدی
Heusler alloys; Order–disorder phenomena; X-ray diffraction (XRD); Anomalous scattering; Neutron diffraction;
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
On the characterisation of antisite defects and ordering in off-stoichiometric Fe2VAl-based Heusler compounds by X-ray anomalous diffraction
چکیده انگلیسی

Compounds based on Fe2VAl are good candidates for low grade heat harvesting owing to the thermoelectric effect. However, it is claimed that their thermoelectric properties are badly influenced by antisite defects, especially at higher temperatures. The present study investigates order-disorder transitions in Fe2VAl ternary Heusler compounds. An inherent problem of these compounds is the close atomic numbers of Fe and V, leading to similar x-ray atomic scattering factors. Hence, the D03 and L21 structures, corresponding to Fe-V antisite defects, are hardly distinguishable by X-ray diffraction. In this work, anomalous scattering and neutron diffraction were successfully combined with differential scanning calorimetry to highlight the order-disorder transitions in Fe2VAl-based compounds. A model has been developed to quantify the ordering parameters. From these results, specific heat-treatments were defined to promote the formation of the L21 ordered phase.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 142, 1 January 2018, Pages 193-200
نویسندگان
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