柠檬酸溶胶-凝胶法制备钡铁氧体晶相变化的研究
发布时间：2018-09-13 09:58
【摘要】：采用柠檬酸溶胶-凝胶法制得钡铁氧体磁性粉末,借助热质量分析(TGA)、红外光谱(FT-IR)、X线衍射(XRD)及扫描电镜(SEM)测试手段研究了不同柠檬酸添加量对煅烧产物晶型的影响。结果表明:当柠檬酸与金属硝酸盐摩尔配比n(CA)/n(MN)≤1.2时,钡铁氧体晶相为W型,当n(CA)/n(MN)=2时,晶相转变为M型;随着柠檬酸量的增加,燃烧产物的晶化温度升高;过量柠檬酸添加改变了中间产物Fe的存在形式,促使γ-Fe_2O_3转化为热稳定性好的α-Fe_2O_3,进而使得W型钡铁氧体的成型温度升高,出现M晶型钡铁氧体。
[Abstract]:Barium ferrite magnetic powder was prepared by citric acid sol-gel method. The effect of citric acid addition on the crystal form of calcined product was studied by means of (TGA), infrared (FT-IR) X-ray diffraction (XRD) and SEM (SEM). The results show that when the molar ratio of citric acid to nitrate n (CA) / n (MN) 鈮，
本文编号：2240854
[Abstract]:Barium ferrite magnetic powder was prepared by citric acid sol-gel method. The effect of citric acid addition on the crystal form of calcined product was studied by means of (TGA), infrared (FT-IR) X-ray diffraction (XRD) and SEM (SEM). The results show that when the molar ratio of citric acid to nitrate n (CA) / n (MN) 鈮，
本文编号：2240854
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