摘要
采用燃烧合成法制备了ZnFe2 O4。研究了ZnFe2 O4粉体燃烧合成温度、燃烧波速度与放热系数k、氧气压力 p和填装密度等参数之间的相互关系 ,讨论了ZnFe2 O4形成机制 ,并通过SEM ,EDS ,XRD和M ssbaur谱 (MS)等分析测试手段对产物的形貌、物相、结构及性能进行了分析。结果表明 :用大颗粒Fe粉 (≤ 45 μm)原料制备ZnFe2 O4的合成反应属于固 -液反应 ,主要由溶解 -析出机制控制 ;产物中含有部分亚稳相Fe1 -xO ;在 15 5 0～ 160 0K之间ZnFe2 O4晶格结构完整 。
Spinel ZnFe_2O_4 powders were prepared by the combustion synthesis method. The formation mechanism of ZnFe_2O_4 and the dependences of the combustion temperature and the combustion wave rate on the coefficient of the mixture exothermicity k, the oxygen pressure p and the relative density of the green mixture were discussed in detail. The powder prepared was examined by SEM, EPS, XRD and MS. The results show that the combustion synthesis reaction of ZnFe_2O_4 using the larger particle size of the Fe powder (≤45 μm) as raw material is a kind solid-liquid reaction, which is controlled by solution_reprecipitation mechanism. There is some metastable phase Fe_ 1-xO exist in the products. The depth of the green mixture conversion (ferritization) is excellent at the temperature range of 1 500-1 600 K and the lattice structure is more regular.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2003年第3期235-240,249,共7页
Journal of The Chinese Ceramic Society
基金
黑龙江省自然科学基金 (E0 1-0 7)
中国博士后基金资助项目
