کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9803502 1516468 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structures of the ζ and ζ′ phases in the Ag-Ga system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Structures of the ζ and ζ′ phases in the Ag-Ga system
چکیده انگلیسی
The crystal structures of the ζ-phase and ζ′-phase have been determined by X-ray powder diffraction and refined by Rietveld method. The space group of the ζ′-phase is P6¯2m with the lattice parameters a = 7.7710(1) and c = 2.8788(1) Å. The ideal formula is Ag2Ga (real composition Ag2+xGa1−x, x = 0.16) and the chemical formula per unit cell is Z = 3. Six Ag atoms occupy the 3g positions with x = 0.63970(8) and the 3f positions with x = 0.30347(9), respectively. Three Ga atoms occupy the 2c and the 1b sites. The ζ-phase is obtained by quenching the sample containing 20 at.% Ga from 500 °C to room temperature. Its space group is close-packed hexagonal, P63/mmc, and the lattice parameters are a = 2.8818(1) and c = 4.6956(1) Å. There are 2 atoms (1.5Ag + 0.5Ga) per unit cell, which occupy the 2c site statistically. The relation between the structures of the ζ- and ζ′-phase is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 399, Issues 1–2, 16 August 2005, Pages 155-159
نویسندگان
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