کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5491744 | 1525126 | 2017 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the AC-conductivity mechanism in nano-crystalline Se79âxTe15In6Pbx (x = 0, 1, 2, 4, 6, 8 and 10) alloys
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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: On the AC-conductivity mechanism in nano-crystalline Se79âxTe15In6Pbx (x = 0, 1, 2, 4, 6, 8 and 10) alloys On the AC-conductivity mechanism in nano-crystalline Se79âxTe15In6Pbx (x = 0, 1, 2, 4, 6, 8 and 10) alloys](/preview/png/5491744.png)
چکیده انگلیسی
In-depth analysis of complex AC-conductivity for nano-crystalline Se79-xTe15In6Pbx (x = 0, 1, 2, 4, 6, 8 and 10Â at wt%) alloys is made in the temperature range 308-423Â K and over the frequency range 10â1-107Â Hz, to understand the conduction mechanism. The investigated nano-crystalline alloys were prepared by melt-quench technique. Sharp structural peaks in X-ray diffraction pattern indicate the nano-crystalline nature, which is also confirmed by FESEM. The AC conductivity shows universal characteristics and at higher frequency a transition from dc to dispersive behavior occurs. Moreover, it is confirmed that ac conductivity (Ïac) obeys the Jonscher power law as ~ Ïs (s< 1). The obtained results are analyzed in the light of various theoretical models. The correlated barrier hopping (CBH) model associated with non-intimate valence alternation pairs (NVAP's) is found most appropriate to describe the conduction mechanisms in these alloys. In addition, the CBH model description reveals that the bipolaron (single polaron) transport dominates at lower (higher) temperature. The density of localized states has also been deduced.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 523, 15 October 2017, Pages 52-61
Journal: Physica B: Condensed Matter - Volume 523, 15 October 2017, Pages 52-61
نویسندگان
Anjali Anjali, Balbir Singh Patial, Suresh Bhardwaj, A.M. Awasthi, Nagesh Thakur,