Paramagnetic centers in SiO2 glass

被引：0
|
作者：
Sano, W
Torikai, D
Suzuki, CK
机构：
[1] USP, Inst Phys, BR-05315970 Sao Paulo, Brazil
[2] UNICAMP, Fac Mech Engn, BR-13081970 Campinas, SP, Brazil
来源：
RADIATION EFFECTS AND DEFECTS IN SOLIDS | 1998年 / 147卷 / 1-2期
基金：
巴西圣保罗研究基金会;
关键词：
paramagnetic centers; SiO2; glass; electron paramagnetic resonance;
D O I：
10.1080/10420159808226389
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
Electron Paramagnetic Resonance (EPR) of ten samples of SiO2 glass was studied at X-band and at room temperature. Spectra of the iron impurity in all these samples were observed even in those with Fe content below 0.06 ppm. The lines found with g-factors 6.5 and 3.7 were assigned to Fe2+ and with g = 2.1 to Fe3+. Sample prepared with addition of nickel at 50 ppm gave a single line at g = 2.219 due to Ni2+ ions in a cluster form. As the resonance of Fe3+ ions also might be interpreted as due to cluster formation, it is suggested that these transition metal ions are some part of the sample segregated in the surface of some grain.
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页码：73 / 76
页数：4
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