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Thermal analysis of the products of SCS of zinc nitrate with glycine and citric acid
Thermochimica Acta ( IF 3.5 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.tca.2020.178809
L.V. Ermakova , V.D. Zhuravlev , Sh.M. Khaliullin , E.G. Vovkotrub

Abstract The composition of powders produced in reactions of Solution Combustion Synthesis (SCS) of zinc nitrate with glycine and a mixture of glycine and citric acid has been studied. The precursors formed on completion of solution combustion reactions were established to contain ZnO and up to 7 wt% of carbonaceous fragments due to incomplete oxidation of fuel. The latter are mixtures of residual carbon (0.2-3 wt%) and the fragments of citric acid decomposition, bound carbon, (0.6-4.4 wt%), which are strongly disordered carbon structures in nature, including amorphous ones. The performed thermal analysis of precursors and modeling allow us to suppose that the process of additional oxidation takes place in two stages – at 240-280 °C (oxidation of organic fragments) and 410-424 °C (oxidation of residual carbon) and is incomplete in character. It was shown that the complete removal of the carbonaceous fragments of organic fuel needs the temperatures close or over 900 °C. The best conductivity of ZnO were 1.13·10-7 and 9.19·10-8 S/cm after SCS and annealing 650 °C, respectively.

中文翻译:

硝酸锌与甘氨酸和柠檬酸的SCS产物的热分析

摘要 研究了硝酸锌与甘氨酸以及甘氨酸和柠檬酸混合物的溶液燃烧合成 (SCS) 反应生成的粉末的组成。由于燃料的不完全氧化,溶液燃烧反应完成后形成的前体被确定为含有 ZnO 和高达 7 wt% 的碳质碎片。后者是残留碳 (0.2-3 wt%) 和柠檬酸分解碎片、结合碳 (0.6-4.4 wt%) 的混合物,它们是自然界中强烈无序的碳结构,包括无定形碳结构。对前体进行的热分析和建模使我们能够假设额外氧化过程分两个阶段进行——240-280 °C(有机碎片氧化)和 410-424 °C(残留碳氧化),并且是性格不完整。结果表明,完全去除有机燃料的含碳碎片需要接近或超过 900 °C 的温度。SCS和650℃退火后,ZnO的最佳电导率分别为1.13·10-7和9.19·10-8 S/cm。
更新日期:2021-01-01
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