Structure and ionic conductivity in lithium—lead—borate glasses

Structural Role of Fluoride in the Ion-Conducting Glass System B2O3−PbO−LiF Studied by Single- and Double-Resonance NMR

“…Within this range of evolution times, the F-bonded Li species have completely decayed in the SEDOR signal I(2t 1 ), while their contribution is emphasized in the F(2t 1 ) -I(2t 1 ) difference signal. As Figure 7c illustrates, the latter is significantly broader than the former, reflecting the effect of the heteronuclear 19 F- 7 Li magnetic dipole-dipole interactions. Both Figures 6 and 7 reveal that in the present glass system the dipolar coupling is significantly weaker than in crystalline LiF.…”

“…The lithium and fluoride ion dynamics were probed by variabletemperature line shape studies. The 7 Li NMR measurements were conducted on a Varian-400 MHz INOVA spectrometer operating at 155.4 MHz, using a wide line Varian probe at a temperature range of 140-353 K. The static 7 Li line shape was obtained from the Fourier transform of the decaying part of a Hahn spin echo, using CYCLOPS phase cycling. A relaxation delay of 60 s and a π/2 pulse length of 4 µs were used.…”

“…Ionic conductivities between 10 -3 and 10 -4 S/cm at room temperature have been reported. 2,7 In addition, lead fluoroborate glasses are interesting host materials for luminescent rare-earth ions for potential laser applications. 8,9 In an effort of optimizing physical properties, the local structure and dynamics of lithium borate based glasses have been extensively investigated by experimental techniques and molecular dynamic simulations.…”

“…[33][34][35][36] In the present paper we use this strategy as one of several complementary techniques within the first multinuclear high-resolution NMR study of the B 2 O 3 -PbO-LiF glass system. On the basis of 7 Li, 11 B, 19 F, and 207 Pb single-and double-resonance experiments on a glass with composition 50B 2 O 3 -10PbO-40LiF, we develop a quantitative structural description of this material. The results outline a general strategy for the structural elucidation of fluoridecontaining glasses.…”

Structural investigations of sodium diborate glasses containing PbO, Bi2O3 and TeO2: Elastic property measurements and spectroscopic studies

“…The proportion of trigonal and tetrahedral boron depends on both the chemistry and concentration of the added modifier oxides. PbO behaves both as a network former and as a network modifier in glasses [24][25][26][27][28]. This role seems to be a function of PbO concentration in the glass.…”