کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8158421 | 1524878 | 2013 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigations of Zr-Ni intermetallic compounds by perturbed angular correlations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Investigations of Zr-Ni intermetallic compounds by perturbed angular correlations Investigations of Zr-Ni intermetallic compounds by perturbed angular correlations](/preview/png/8158421.png)
چکیده انگلیسی
The hyperfine interactions experienced by 181Ta in ZrNi5 and Zr2Ni7 intermetallic compounds have been investigated by the perturbed angular correlation (PAC) technique. In ZrNi5, a strong electric quadrupole interaction (â¼40%) with ÏQ=72.0(1) Mrad/s, η=0.25(1), δ=0 at room temperature has been found due to the presence of Zr2Ni7 contaminating phase produced during sample preparation in the arc furnace. A weak quadrupole interaction of Zr2Ni7 (â¼5%) with ÏQ=65(1) Mrad/s, η=0.24(6), δ=0 has also been observed. The cubic component of ZrNi5 also has been observed (â¼40% at room temperature) in this sample along with associated defect (15%). It is found that at 873 K, the cubic fraction increases to â¼54% at the cost of its defect fraction. No magnetic interaction in ZrNi5 has been observed which supports the earlier PAC results but rules out the result of strong magnetic ordering found from magnetization measurement. In Zr2Ni7, two regular fractions corresponding to two different crystallographic sites of Zr have been clearly identified with the parameters ÏQ(1)=70.9(1) Mrad/s, η(1)=0.28(1), δ=1.3(3)% and ÏQ(2)=64(1) Mrad/s, η(2)=0.34(8), δ=0 while contradictory results were reported from previous measurements.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 342, September 2013, Pages 87-91
Journal: Journal of Magnetism and Magnetic Materials - Volume 342, September 2013, Pages 87-91
نویسندگان
C.C. Dey,