摘要
采用低温自蔓延方法合成了Mn-Zn铁氧体纳米晶,EDS测试结果表明该纳米晶的化学式为(MnZn)_(0.5)Fe_2O_4。由ESR谱图求得其g值为9.9560,远大于自由电子的g值(g_e=2.0023),这主要由Mn^(2+),Fe^(3+)的3d^5半充满价电子层结构和它们在尖晶石型晶胞(MnZn)_(0.5)Fe_2O_4中的磁矩偶合作用所致;XRD测试结果显示该Mn-Zn铁氧体纳米晶结晶良好。TEM测试结果表明该Mn-Zn铁氧体纳米晶粒径较均匀,晶粒粒径为10～20 nm,与由Scherrer公式算得的晶粒尺寸16.9 nm较吻合。
Nanometer-sized crystal of (MnZn)_(0.5) Fe_2O_4 was synthesized through low temperature self-propagating method, which was characterized by the XRD and EDS tests. The g value of the Mn-Zn ferrite was calculated as 9.9560, larger than that of the free electron, and which is mainly caused by the common influence of the 3d^5 half-filled valence electron layer structure and the magnetic moment coupling effect of Mn^(2+) and Fe^(3+) in the spinel-type crystal of (MnZn)_(0.5)Fe_2O_4. TEM test indicated that the particle size of the Mn-Zn ferrite nanometer-sized crystal was well-distributed and the particle size was 10～20 nm which was coincided with the result of crystal particle size (16.9 nm) calculated by the Scherrer formula.
出处
《粉末冶金材料科学与工程》
EI
2002年第2期102-107,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金(50174059)
国家"863"高技术计划项目(2001AA218011)
关键词
低温自蔓延合成
软磁铁氧体
纳米晶
G因子
low temperature self-propagating synthesis
soft-magnetic ferrite
nanometer-sized crystal
g value
