کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1608408 1516248 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and characterization of nanocrystalline MgAl2O4 spinel via modified sol-gel method
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Synthesis and characterization of nanocrystalline MgAl2O4 spinel via modified sol-gel method
چکیده انگلیسی
Nanocrystallines of magnesium aluminate spinel (MgAl2O4) were synthesis by modified sol-gel method using aluminum nitrate, magnesium nitrate, citric acid and diethylene glycol monoethyl ether were used as precursor materials with a molar ratio Al/Mg = 2. After obtained a dry powder, the precursor was heat-treated in air at desired temperatures (700-900 °C) for 2 h. The formation nanocrystallines of MgAl2O4 spinel were characterization by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Thermal gravimetric and differential thermal analysis (TGA/DTA), Field emission scanning electron microcopy (FESEM) with the energy dispersive X-ray spectroscopy (EDX), High resolution transmission electron microscopy (HRTEM) and specific surface area of the synthesized powders was measured with a Brunauer-Emmett-Teller (BET) apparatus using N2 adsorption. According to obtained XRD patterns the formation of single phase MgAl2O4 completed up 700 °C. The average crystallite's sizes increased with increasing temperature of calcination, but the specific surface area spinels decreased. The average crystallite's sizes spinel and specific surface area at 800 °C were estimated about 11.07 nm and 154 m2 g−1, respectively. The results of FESEM analysis show that the nanoparticles shape are as spherical shape, uniform and a little agglomerated. The dimension of nanoparticles used by HRTEM was measured to be about 12 nm by averaging 20 particles at 800 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 645, 5 October 2015, Pages 535-540
نویسندگان
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