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2010 , Vol. 25 >Issue 4: 396 - 400

DOI: https://doi.org/10.3724/SP.J.1077.2010.00396

研究论文

自蔓延燃烧法合成NiFe2O4纳米粉体的机理研究

  • 李桂金 ,
  • 白志民 ,
  • 金 玥 ,
  • 傅 瀛
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  • 中国地质大学（北京） 材料科学与工程学院, 北京 100083

收稿日期: 2009-07-17

  修回日期: 2009-10-16

  网络出版日期: 2010-04-27

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Mechanism of Auto Combustion Method in Synthesis of Nanocrystalline NiFe2O4 Powders

  • LI Gui-Jin ,
  • BAI Zhi-Min ,
  • JIN Yue ,
  • FU Ying
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  • School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China

Received date: 2009-07-17

  Revised date: 2009-10-16

  Online published: 2010-04-27

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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

本文引用格式

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, 2010 , 25(4) : 396 -400 . DOI: 10.3724/SP.J.1077.2010.00396

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

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