稀土纳米介孔固体电子顺磁共振  

Rare earth nanoscale mesoporous solid with electron paramagnetic resonance

作　　者：张世英[1] 魏坤[2] 

机构地区：[1]长沙大学,湖南长沙410003 [2]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《化工学报》2005年第1期163-167,共5页CIESC Journal

基　　金：湖南省自然科学基金项目 (0 2JJY3 0 47)~~

摘　　要：以RE(NO3 ) 3 为先驱物 ,采用原位掺入技术把稀土离子组装进了稀土纳米in RE HMS (RE :Nd ,Sm)六方介孔固体中 .未焙烧in RE HMS样品的EPR谱为直线 ,没有顺磁特性 ,然而焙烧后的介孔固体却显示一个各向同心线中心 .稀土离子取代Si原子之后 ,产生了零场分裂常数的分布 .纳米in RE HMS (RE :Nd ,Sm)介孔固体的giso值依次为 2 187、 2 16 3,峰到峰的线宽依次为 0 0 3T、 0 0 3T .纳米in RE HMS (RE :Nd ,Sm)介孔固体的尺寸依次为 31nm、 2 1nm .平均孔径依次为 2 2 7nm和 2 18nm .The rare earth ions (RE3+: Nd3+, Sm3+) were loaded into the HMS by the in situ incorporation technique in which RE(NO3)3 was used as RE3 precursor. The EPR spectra of synthesised samples were beeline. The distribution of zero region split parameter arose from substituting silicon atomic with rare earth. The EPR spectra of RE-HMS(RE: Nd, Sm) calcined nanoscale samples showed one isotropic line centered at giso=2.187, 2.163, with peak to peak line width of about 0.03 T and 0.03 T, respectively. The mesoporous solid size of RE-HMS (RE: Nd, Sm) was 31 nm in Nd-HMS and 21 nm in Sm-HMS. The pore size of mesoporous materials RE-HMS (RE: Nd, Sm) from adsorption isotherms was 2.27 nm, 2.18 nm, respectively.

关 键 词：稀土 纳米介孔固体 电子顺磁共振 机理 

分 类 号：TQ325.9[化学工程—合成树脂塑料工业]