分别以氨基乙酸、柠檬酸、葡萄糖为燃料,Co(NO3)2·6H2O为氧化剂,采用溶液燃烧法合成C03O4粉体,并对氨基乙酸为燃料合成的Co3O4粉体在500℃、600℃和700℃热处理,研究其结构、微观形貌和磁学性能.研究表明各燃料配制的前驱体溶液在300℃均可发生燃烧反应合成Co3O4粉体,以氨基乙酸为燃料时,合成粉体的颗粒较大,中间有气孔,分散性好,残留少量的氨基乙酸.n(氨基乙酸)∶n(硝酸钴)=1.11∶1时合成的Co3O4粉体600℃热处理后得到了高纯度、分散性好、平均径向尺寸80 nm的Co3O4纳米粉体.以氨基乙酸为燃料合成的Co3O4产物在600℃和700℃热处理后,其矫顽力和剩磁值都比500℃热处理后的要小.
Co3O4 powders were synthesized by solution combustion technique using glycine,citric acid,glucose as fuel,respectively,and Co (NO3)2 · 6H2O as oxidizing agent.Microstructure,morphology and magnetic properties of Co3O4 powders which were synthesized through glycine as fuel and annealed at 500 ℃,600 ℃ and 700 ℃ were investigated.The results showed that Co3O4 powders can be synthesized by combustion reaction with different precursor solutions at 300 ℃.The Co3O4 powders which were synthesized by using glycine as fuel had large particle zise,certain porosity,good dispersion and a small amount of residual glycine.The nanocrystalline Co3O4 powders with high purity,fine dispersion,80 nm average radial dimension could be obtained while glycine-to-Co(NO3)s · 6H2O molar ratio was 1.11 ∶ 1 and annealing temperature was 600 ℃.The synthesized Co3O4 powders annealed at 600 ℃ and 700 ℃ exhibited lower coercivity and remanence value than those annealed at 500 ℃.
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