外文题目: Structural Studies of Fluoroborate Laser Glasses by Solid State NMR and EPR Spectroscopies
作者: Zhang, Ruili; de Oliveira, Marcos; Wang, Zaiyang; Fernandes, Roger Gomes; de Camargo, Andrea S. S.; Ren, Jinjun; Zhang, Long; Eckert, Hellmut
刊名: J. Phys. Chem. C
年: 2017 卷: 121 期: 1 页： 741--752
英文关键词:

ECHO ENVELOPE MODULATION; DOUBLE-RESONANCE NMR; NUCLEAR-MAGNETIC-RESONANCE; LEAD BORATE GLASSES; RARE-EARTH; FLUOROPHOSPHATE GLASSES; TELLURITE GLASSES; PHOSPHATE-GLASSES; OXIDE GLASSES; LOCAL ORDER
英文摘要:
The structure of glasses in the systems (100 - x)B2O3-xPbF(2) (x = 30, 40, and 50) and 50B(2)O(3)-(50 - x)PbO-xPbF(2) (x = 5, 10, 15, 20, 25, 30, 35, 40, and 45) has been studied by solid state NMR and EPR spectroscopies.-On the basis Of B-11 and F-19 high resolution solid state NMR as well as on B-11/F-19 double resonance results, we develop a quantitative structural description on the atomic scale. F-19 NMR results indicate a systematic dependence of the fluoride speciation on PbF2 content: At low x-values, F- ions are predominantly found on BO3/2F- units, whereas, at higher x-values, fluoride tends to be sequestrated into amorphous domains rich in PbF2. In addition, both pulsed EPR studies of Yb3+ doped glasses and photophysical studies of Eu3+ doped samples indicate a mixed fluoride/borate coordination of the rare-earth ions, and the absence of nanophase segregation effects.


文献类型: 期刊论文
正文语种: English
收录类别: SCI
DOI: 10.1021/acs.jpcc.6b11187


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