کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7836393 1503538 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The electronic structures and work functions of (100) surface of typical binary and doped REB6 single crystals
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
The electronic structures and work functions of (100) surface of typical binary and doped REB6 single crystals
چکیده انگلیسی
The density function theory been used to calculate the electronic structures of binary and doped rare earth hexaborides (REB6), which exhibits the large density of states (DOS) near Fermi level. The d orbital elections of RE element contribute the electronic states of election emission near the Fermi level, which imply that the REB6 (RE = La, Ce, Gd) with wide distribution of high density d orbital electrons could provide a lower work function and excellent emission properties. Doping RE elements into binary REB6 can adjust DOS and the position of the Fermi energy level. The calculated work functions of considered REB6 (100) surface show that the REB6 (RE = La, Ce, Gd) have lower work function and doping RE elements with active d orbital electrons can significantly reduce work function of binary REB6. The thermionic emission test results are basically accordant with the calculated value, proving the first principles calculation could provide a good theoretical guidance for the study of electron emission properties of REB6.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 434, 15 March 2018, Pages 613-619
نویسندگان
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