摘要
采用水热法合成了M型Sr Fe12O19铁氧体粉末,并对其烧结前后的结构和磁性能进行了研究。实验发现,无论烧结前还是后样品都是单相铁氧体结构。烧结后,样品的矫顽力和饱和磁化强度分别从42.9 k A/m和48.1 emu/g显著增加到237.8 k A/m和64.9 emu/g,这与高温烧结后其晶粒的长大密切相关。实验还发现,烧结后样品中存在着剩磁增强效应,其原因可归于样品中不同磁硬度的纳米晶相之间的磁耦合作用。
M-type Sr Fe12O19 ferrite powders were synthesized via a hydrothermal method,and their structure and magnetic properties before and after sintering were studied. It is found that all the assynthesized and sintered specimens exhibit single phase structure. After sintering,the coercivity and saturation magnetization increase markedly from 42. 9 k A / m and 48. 1 emu / g to 237. 8 k A / m and 64. 9emu / g,respectively,which can be attributed to the growth of grains at high temperature. It is also observed the remanence enhancement in sintered specimens,which could be ascribed to the exchange coupling between nanocrystalline magnetically hard grains.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2014年第11期2870-2873,2879,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金(11204003)
