摘要
对铬离子置换的钡铁氧体ＢａＦ１２－２ｘＣｒ２ｘＯ１９（ｘ＝０，１，２，３，３．５，４）进行了穆斯堡尔港学研究。结果表明，Ｃｒ离子始终不进人４ｆ１晶位；对于２ａ、４ｆ２、１２ｋ品位呈随机置换，没有明显的优先占据趋势，从ｘ＝４时的穆斯堡尔诺看到，Ｃｒ离子也进人２ｂ位，但置换量很小；随着Ｃｒ离子含量的增加，材料的居里温度降低，下降速率约为５０Ｋ／Ｃｒ原子。
Cr ion substituted barium hexaferrite BaFe12-2xCr2xO19 (x=0,1,2,3.5 and 4) has been studied by means of Mossbauer spectroscopy.Cr ions are not found to occupy 4f1 sites at all. For the distribution of Cr ions among 2a,4f2 and 12k sites,our data reveal a random occupation and do not show a remarkable preferential substitution.From Mossbauer spectra for x=4,Cr ions are observed entering 2b sites,but the number off Fe ions substituted by Cr ions in this site is very small.The Carie temperature of the material decreases almost linearly with x at a rate of about 50K/Cr atom.
出处
《核技术》
CAS
CSCD
北大核心
1994年第12期737-741,共5页
Nuclear Techniques
关键词
穆斯堡尔谱
铁氧体
铬置换
永磁材料
spectroscopy,Ferrite,Cr substitution,Site occupation
