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Effect of fuel and fuel to oxidizer ratio in solution combustion synthesis of nanoceramic powders: MgO, CaO and ZnO
Solid State Sciences ( IF 3.4 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.solidstatesciences.2020.106426
Baburao N. Sherikar , Balaram Sahoo , Arun M. Umarji

Abstract The fuel to oxidizers (F/O) ratio determines the effectiveness of combustion reaction and the amount of heat evolution (heat of combustion reaction). Hence, optimization of F/O ratio is important for the formation of phase pure ceramic powders by the solution combustion synthesis (SCS) method. The present work demonstrates the effect of F/O ratio on the synthesis of phase pure MgO, ZnO, CaO ceramic powders by SCS method and also the effect of fuels (urea, glycine and alanine) for ZnO synthesis. To understand the mechanism of the combustion reaction at different F/O ratios, we calculated the theoretical flame temperatures by using the thermodynamic concept and analyzed. Using this information, in association with the phase content of the synthesized samples (obtained by the structural characterization using X-ray diffraction), we described the role of fuel to oxidizer ratio in synthesizing ceramic materials by SCS method. We found that, F/O strongly controls the structural nature and characteristics of the synthesized ceramic powder products. Furthermore, comparing the nature of combustion products for divalent and trivalent cation based ceramics, we conclude that solution combustion synthesis favors the synthesis of trivalent cation based oxides over purely divalent cation based oxides. Our work provides the insights into the understanding and the importance of using proper fuel to oxidizer ratio in synthesizing phase pure ceramic powder by SCS method.

中文翻译:

燃料和燃料氧化剂比在纳米陶瓷粉末的溶液燃烧合成中的影响:MgO、CaO和ZnO

摘要 燃料与氧化剂 (F/O) 之比决定了燃烧反应的有效性和放热量(燃烧反应热)。因此,优化 F/O 比对于通过溶液燃烧合成 (SCS) 方法形成相纯陶瓷粉末很重要。目前的工作证明了 F/O 比对 SCS 法合成相纯 MgO、ZnO、CaO 陶瓷粉末的影响,以及燃料(尿素、甘氨酸和丙氨酸)对 ZnO 合成的影响。为了理解不同F/O比下燃烧反应的机理,我们利用热力学概念计算了理论火焰温度并进行了分析。使用这些信息,结合合成样品的相含量(通过使用 X 射线衍射的结构表征获得),我们描述了燃料氧化剂比在 SCS 法合成陶瓷材料中的作用。我们发现,F/O 强烈控制了合成陶瓷粉末产品的结构性质和特性。此外,比较二价和三价阳离子基陶瓷的燃烧产物的性质,我们得出结论,溶液燃烧合成有利于三价阳离子基氧化物的合成,而不是纯二价阳离子基氧化物的合成。我们的工作提供了对使用适当的燃料氧化剂比在通过 SCS 法合成相纯陶瓷粉末的理解和重要性的见解。比较二价和三价阳离子基陶瓷的燃烧产物的性质,我们得出结论,溶液燃烧合成有利于三价阳离子基氧化物的合成,而不是纯二价阳离子基氧化物的合成。我们的工作提供了对使用适当的燃料氧化剂比在通过 SCS 法合成相纯陶瓷粉末的理解和重要性的见解。比较二价和三价阳离子基陶瓷的燃烧产物的性质,我们得出结论,溶液燃烧合成有利于三价阳离子基氧化物的合成,而不是纯二价阳离子基氧化物的合成。我们的工作提供了对使用适当的燃料氧化剂比在通过 SCS 法合成相纯陶瓷粉末的理解和重要性的见解。
更新日期:2020-11-01
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