Abstract

Features of processes for the synthesis of nanosized complex perovskite-type oxides (lanthanum manganite) and doped cerium dioxide in combustion reactions of nitrate–polymer precursors under conditions of high-density electrical charges generation have been studied. Effect of external electromagnetic field on charges generation allowing change in the sign and magnitude of precursor charge has been established. It has been shown that the labile oxidation state of metals comprising resulting oxides is the requirement for charges generation. Examples of aluminum and zirconium oxides illustrate this conclusion by the absence of charges during precursors combustion. Inert (N₂) or reducing atmosphere (N₂ + CO) prevents the reversible oxidation of manganese ions in perovskite and cerium in dioxide, which in turn prevents charges formation. Addition of nitrogen (NО) and carbon oxides (CO) to nitrogen as combustion medium that suppresses charges formation does not result in their increase, hence, charges appear immediately when molecular species form during combustion. Metal carriers of precursors decrease accumulated charge due to higher electric capacity, while porous carriers also provide charge dissipation.

中文翻译：

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基于锰酸镧和二氧化铈材料的硝酸盐有机前体燃烧时电荷的热化学产生的决定因素

摘要

已经研究了在高密度电荷产生条件下硝酸盐-聚合物前体的燃烧反应中合成纳米尺寸复合钙钛矿型氧化物（锰酸镧）和掺杂二氧化铈的工艺特征。已经确定了外部电磁场对电荷产生的影响，允许改变前体电荷的符号和大小。已经表明，包含所得氧化物的金属的不稳定氧化态是产生电荷的必要条件。铝和锆氧化物的例子通过在前体燃烧期间不存在电荷来说明这一结论。惰性 (N ₂ ) 或还原性气氛 (N ₂+ CO) 防止钙钛矿中锰离子和二氧化铈中的可逆氧化，从而防止电荷形成。在氮中添加氮 (NО) 和碳氧化物 (CO) 作为抑制电荷形成的燃烧介质不会导致它们的增加，因此，当燃烧过程中形成分子物种时，电荷会立即出现。前体的金属载流子由于较高的电容量而减少了累积的电荷，而多孔载流子也提供电荷耗散。