摘要
用固相反应法制备了大块的 Zn Fe2 O4 ,用聚乙烯醇 ( PVA)溶胶凝胶法制备出 6～ 90 nm的 Zn Fe2 O4 纳米微粉 ,用 X衍射研究了 Zn铁氧体纳米颗粒的结构 .从 4.2～ 3 0 0 .0 K的变温穆斯堡尔谱的结果发现纳米晶的磁有序转变温度 ( TN)比大块材料的高 ,这是 Fe离子和 Zn离子在 A,B位不同分布的结果 .尺寸越小的纳米颗粒具有较大的 θYK.
ZnFe 2O 4 nanoparticles have been prepared by sol-gel methods.Mssbauer spectra from 4.2 K to RT, showing that their magnetic ordering took place at a much higher temperature than that of bulk zinc ferrite.The large increase of T N for nanoparticles can be attributed mainly to the redistribution of Fe and Zn cations on the A and B sites.It was found that there are different hyperfine interactions between nanoparticles and bulk material.Nanoparticles with smaller size have bigger θ YK(Yaffet-Kittel angle).
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2003年第5期35-37,共3页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金资助项目 ( 1 0 2 740 2 7)
