Structural Studies of Fluoroborate Laser Glasses by Solid State NMR and EPR Spectroscopies

Author(s)

Zhang, Ruili ; de Oliveira, Marcos ; Wang, Zaiyang ; Fernandes, Roger Gomes ; de Camargo, Andrea S. S. ; Ren, Jinjun ; Zhang, Long ; Eckert, Hellmut

• Document type: Journal article
• Source: Journal of Physical Chemistry C; v. 121, n. 1, p. 741-752, JAN 12 2017.
• Web of Science Citations: 8

Abstract

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. (AU)

• FAPESP's process: 13/23490-3 - Magnetic resonance techniques for the study of Structure/Property correlations in photonic glassy and glass ceramic materials
• Grantee: Marcos de Oliveira Junior
• Support type: Scholarships in Brazil - Post-Doctorate
• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 15/04063-2 - Coordination environments of rare-earth ions in photonic glasses analyzed by pulsed electron paramagnetic resonance techniques
• Grantee: Marcos de Oliveira Junior
• Support type: Scholarships abroad - Research Internship - Post-doctor