自蔓延燃烧法合成NiFe2O4纳米粉体的机理研究

doi:10.3724/SP.J.1077.2010.00396

摘要/Abstract

摘要： 利用柠檬酸硝酸盐溶胶凝胶自蔓延燃烧法, 在室温下制备了NiFe₂O₄
纳米粉体.通过调节氨水在前驱体溶液中的用量,获得了不同类型的干凝胶,并制备了相应的自燃烧粉体.借助XRD、TEM、IR、TGDTA技术, 研究了自燃烧粉体结晶度的变化规律,干凝胶的性质及热分解过程,进而分析了柠檬酸硝酸盐自蔓延燃烧的机理.研究表明,自燃烧粉体的主要物相为NiFe₂O₄,但含有少量α-Fe₂O₃与FeNi₃杂相. 随着氨水用量的增加, 合成粉体的结晶度逐渐提高. 干凝胶内含有无定形非晶相与NH₄NO₃结晶相, 氨水用量对NH₄NO₃含量及干凝胶的性质有显著的影响. 自蔓延燃烧的本质是NH₄NO₃分解与柠檬酸燃烧相互促进而形成的链式反应.

关键词: 柠檬酸硝酸盐, 自蔓延燃烧, NiFe₂O₄, 机理

Abstract: Nanocrystalline NiFe₂O₄ powders were synthesized by citrate. Nitrate SolGel auto combustion method at room temperature. Various xerogels were obtained by adding different amounts of ammonia into precursor solution. The corresponding auto combustion powders were prepared through subsequent auto combustion process. The variation regularity of crystallinity of auto combustion powders, properties and thermal decomposition process of xerogel were investigated by XRD, TEM, IR and TG-DTA techniques. The mechanism of auto combustion method was further studied. The results indicate that auto combustion powders are mainly composed of NiFe₂O₄ phase with small amout impurity phase of α-Fe₂O₃ and FeNi3. The crystallinity of auto combustion powders are enhanced with increasing the amount of ammonia. The xerogel contains amorphous phase and NH₄NO₃ crystallization phase. The amount of ammonia exerts appreciable effects on the quantity of NH₄NO₃ and properties of xerogel. The mechanism of auto combustion is a chain reaction which is formed by mutual promotion of NH₄NO₃ decomposition and citric acid combustion.

Key words: citratenitrate, auto combustion, NiFe₂O₄, mechanism

中图分类号:

TQ133

李桂金,白志民,金玥,傅瀛. 自蔓延燃烧法合成NiFe₂O₄纳米粉体的机理研究[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2010.00396.

LI Gui-Jin,BAI Zhi-Min,JIN Yue,FU Ying. Mechanism of Auto Combustion Method in Synthesis of Nanocrystalline NiFe₂O₄ Powders
[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00396.

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自蔓延燃烧法合成NiFe₂O₄纳米粉体的机理研究

Mechanism of Auto Combustion Method in Synthesis of Nanocrystalline NiFe₂O₄ Powders

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