کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1620334 | 1005733 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The conduction mechanism of Cu-Si ferrite
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The conduction mechanism of Cu-Si ferrite The conduction mechanism of Cu-Si ferrite](/preview/png/1620334.png)
چکیده انگلیسی
The mixed ferrite Cu1+x Six Fe2â2x O4; with 0 â¤Â x â¤Â 0.3 in step of 0.05 were prepared by standard ceramic techniques. The X-ray analysis confirmed that the compositions are well formed in a single phase. The d.c. and a.c. electrical conductivity as a function of temperature have been studied. The relation lnÂ Ï vs. Tâ1 showed two regions with different slopes for all values of x except x = 0.0 showed one slope only. The two activation energies around a kink point called Tk were calculated. The change of the slope at Tk was attributed to a change in the nature of type of conduction mechanism (i.e. from n-type to p-type). The activation energies were greater than 0.3 eV; which clearly suggested that the conduction is due to small polaron model.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 498, Issue 1, 21 May 2010, Pages 19-25
Journal: Journal of Alloys and Compounds - Volume 498, Issue 1, 21 May 2010, Pages 19-25
نویسندگان
S.A. Mazen, A.M. El Taher,