کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1515758 | 1511531 | 2014 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure of sol-gel derived Mn-doped gahnite: Correlation of TEM and XRD investigations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Microstructure of sol-gel derived Mn-doped gahnite: Correlation of TEM and XRD investigations Microstructure of sol-gel derived Mn-doped gahnite: Correlation of TEM and XRD investigations](/preview/png/1515758.png)
چکیده انگلیسی
Powder ZnAl2O4 (gahnite) samples doped with 0, 4.3, 7.6 and 11.7 at% Mn (in relation to Zn) were prepared by a sol-gel technique followed by thermal treatment. The effect of manganese doping on microstructure of the samples has been investigated by transmission electron microscopy and X-ray diffraction. Diffraction patterns showed that all samples were cubic with a spinel structure, space group Fd3¯m. Diffraction lines were broadened indicating nanocrystalline samples. Transmission electron microscopy investigations confirmed that the samples were nanocrystalline. Particles (grains) in the samples, as observed by transmission electron microscopy, were evenly shaped and grain size distribution could be fitted to a lognormal function. Grain sizes determined by TEM analysis and crystallite sizes obtained from diffraction line-broadening analysis were similar. Both decreased with increasing manganese doping level. Increase in doping level from 0 to 11.7 at% Mn caused the change in grain size from 25.0(7) nm to 14.2(3) nm and the change in crystallite size from 24.1(1) nm to 18.0(1) nm. Doping Mn2+ cations acted as defects in the gahnite structure that increased lattice strain from 0.07(1)% for undoped sample to 0.21% for sample doped with 11.7 at% Mn, and disturbed the crystallites to grow.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 75, Issue 11, November 2014, Pages 1240-1244
Journal: Journal of Physics and Chemistry of Solids - Volume 75, Issue 11, November 2014, Pages 1240-1244
نویسندگان
Martina VrankiÄ, Kristina Žagar, Mirjana BijeliÄ, Jasminka PopoviÄ, Biserka Gržeta, Stanislav Kurajica,