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 ζⲠphases in the Ag-Ga system
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
The crystal structures of the ζ-phase and ζâ²-phase have been determined by X-ray powder diffraction and refined by Rietveld method. The space group of the ζâ²-phase is P6¯2m with the lattice parameters a = 7.7710(1) and c = 2.8788(1) Ã
. The ideal formula is Ag2Ga (real composition Ag2+xGa1âx, 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) Ã
. 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 ζâ²-phase is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 399, Issues 1â2, 16 August 2005, Pages 155-159
Journal: Journal of Alloys and Compounds - Volume 399, Issues 1â2, 16 August 2005, Pages 155-159
نویسندگان
Y. Zhang, Q.L. Liu, J.B. Li, J.K. Liang, J. Luo, F.S. Liu, Y.G. Xiao, G.H. Rao,