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燃烧合成ZnFe₂O₄的相转变与反应机制研究

Phase transformation and the mechanism of combustion synthesis of ZnFe₂O₄ ferrite powders

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【Author】 LI Yao~(1), ZHAO Jiu-peng~2, JIANG Jiu-xing~1, HE Xiao-dong~1 (1.Research Institute of Composites, Harbin Institute of Technology, Harbin 150001, China; 2.Dept. of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China)

【机构】哈尔滨工业大学复合材料研究所；哈尔滨工业大学应用化学系；哈尔滨工业大学复合材料研究所黑龙江哈尔滨150001；黑龙江哈尔滨150001；黑龙江哈尔滨150001；黑龙江哈尔滨150001；

【摘要】采用"气窒"法实现燃烧波的"淬熄",获得了燃烧合成Zn铁氧体粉体不同阶段的燃烧产物.采用XRD、SEM和m ssbauer谱研究燃烧产物的相组成和微观结构的变化.提出了燃烧合成Zn铁氧体的溶解-析出机制,即铁粉在氧气中燃烧,被氧化成Fe2O3.在高温下,Fe和Fe2O3部分熔化成液相.高熔点的ZnO颗粒悬浮于液相中并逐渐溶解,最后Zn铁氧体逐渐从液相中析出.此外,结合上述分析,给出了燃烧合成ZnFe2O4的反应机制模型.更多还原

【Abstract】 The reaction mechanism of combustion synthesis of zinc ferrite which belongs to the complex oxide combustion reaction was investigated by using a combustion front quenching method. Phase transformation and microstructural evolution of the quenched samples were observed by XRD, SEM and mssbauer spectroscopy. The results showed that the combustion proceeded by a dissolution-precipitation mechanism, viz. the iron was burned to form Fe₂O₃ in an oxygen atmosphere and melting of the Fe₂O₃ led to the dissolving of the ZnO particles, then ZnFe₂O₄ precipitated out. In addition, a model of the mechanism was drawn.更多还原