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Technical aspect for oxidation of magnesium and aluminum nitrates to manufacture nano- and micro-sized MgAl2O4 spinel by combustion method

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Journal of Advanced Ceramics 2017年第3期6卷 187-195页

作者： Shiva SALEM Faculty of Chemical Engineering Urmia University of Technology 57166-17165 Urmia Iran

In the present investigation, the nano- and micro-sized powders were synthesized by stoichiometric contents of magnesium and aluminum nitrates using combustion–oxidation method. The study was conducted over a wide range of operating conditions, in terms of fuel ratio and calcination temperature. The characteristics of magnesium aluminate powders were studied by differential thermal analysis and thermogravimetry (DTA–TG), Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), and transmission electron microscopy (TEM) techniques. The thermal stability of powders was evaluated by calcination at different temperatures. Differences of the specific surface areas were related to the composition and crystallite size. The importance of fuel ratio and calcination temperature to achieve the nano- and micro-sized oxide was discussed in detail. The fuel ratio of 0.56 and calcination at 800 ℃ provided the conditions to achieve the nano-scale magnesium aluminate powders, smaller than 20 nm. The application of presented algorithm can be an important tool for control of particle size in the nano- and micro-scale.

关键词： magnesium aluminate spinel oxidation nano-crystallite combustion calcination

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A Novel Route to Synthesize nano-crystalline Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O(3-δ) Perovskite Oxide at High Temperature

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Chinese Chemical Letters 2006年第10期17卷 1353-1356页

作者： Wei ZHOU Zong Ping SHAO Wan Qin JIN Key Laboratory of Materials-Oriented Chemical Engineering of Ministry of Education of China College of Chemistry and Chemical Engineering Nanjing University of Technology Nanjing 210009

It is normally difficult to prepare nano-sized Ba0.5Sr0.5Co0.8Fe0.2O3-δ（BSCF） oxide at high temperature due to its high surface activity. The complexing process, which has successfully applied in the synthesis of nano Sm0.15Ce0.85I1.925 with crystallite size down to 5 nml, just resulted in a coarse BSCF with crystaUite size of 41.9 nm at 900℃. We applied a novel process by simply modifying the solid precursor from the complexing process with concentrated nitric acid treatment. The obtained BSCF powder had a crystaUite size of -25 nm even calcined at 1000℃. The small crystaUite size is extremely promising to enhance the electrochemical performance of cathode for solid oxide fuel cell dramatically.

关键词： nano-crystallite perovskite solid oxide fuel cells.

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