کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5468170 | 1518929 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental and first-principle studies of ferromagnetism in Na-doped SnO2 nanoparticles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Experimental and first-principle studies of ferromagnetism in Na-doped SnO2 nanoparticles Experimental and first-principle studies of ferromagnetism in Na-doped SnO2 nanoparticles](/preview/png/5468170.png)
چکیده انگلیسی
Sn1âxNaxO2 nanoparticles (about 5 nm) have been successfully synthesized by a template-free hydrothermal growth method. XRD and XPS analyses reveal that the incorporated Na atoms substitute for Sn atoms in SnO2 lattice. The absorption spectra data show the band-gap decreases at low doping concentration (x â¤Â 4%). With further doping, a transformation of Na atoms from substitutional sites to interstitial sites occurs. Magnetic measurements at room temperature showed a weak ferromagnetic behavior characterized by an open hysteresis loop. Their saturation magnetization MS increases initially with increasing Na concentrations and the largest saturation magnetization of 1.1 memu/g appears in Sn0.96Na0.04O2; however for x > 0.04, MS decreases. With the combination of defect analysis based on experimental results and first-principle calculations of the possible magnetic defect centers in Na-doped SnO2, the effect of defects on the nature and origin of ferromagnetism was investigated. The results suggest in Na-doped SnO2 nanoparticles the holes created by Na substituted incorporation may be the origin of the ferromagnetism in Na-doped SnO2 nanoparticles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 141, July 2017, Pages 62-67
Journal: Vacuum - Volume 141, July 2017, Pages 62-67
نویسندگان
Jianchun Wang, Dingbang Zhou, Ying Li, Ping Wu,