Recent progress in the area of NMR characterization of ionic transport and relaxation in glasses

Differential scanning calorimetry, x-ray diffraction and F19 nuclear magnetic resonance investigations of the crystallization of InF3-based glasses

“…[15][16][17] In particular, fluoride glasses have been investigated by 19 F NMR for more than 15 years. Most of the works were focused on ZrF 4 -based glasses, concerning temperature dependence of the 19 F linewidth and nuclear relaxation times.…”

“…14,24,25 Progress in NMR characterization of ionic transport and relaxation in glasses was recently reviewed by Kanert and co-workers. 15 In general, little attention has been paid to NMR studies concerning the crystallization process occurring above the glass transition temperature. Some measurements of the 19 F spin-lattice relaxation time, bellow and above T g , have been reported in ZBLALi and CLAP fluoride glasses.…”

“…4͒ exhibits a broad asymmetric minimum near 274 K, very similar to that determined for ternary compounds, with the fluorite structure, 16 and also for fluoride glasses at elevated temperatures where, as mentioned above, the diffusive fluorine ionic motions are responsible for the temperature dependence of the nuclear relaxation. 15 The origin of the asymmetric minimum was attributed to a fast decay of the spin correlation function, where for a lower time, t, compared to , decays faster than for the phenomenologically assumed exponential form, exp(Ϫt/), characteristic of the Bloembergen-Purcell-Pound ͑BPP͒ model. 16 As discussed quantitatively in Ref.…”

Glass structure and ion dynamics of lead–cadmium fluorgermanate glasses

“…Glasses with composition 60PbGeO 3 -xPbF 2 -yCdF 2 ͑in mol %͒, with xϩyϭ40 and xϭ10, 20,30,40, were prepared by the classical melting (Tϭ1073 K for 30 min in open Pt-Au crucibles͒ and quenching method ͑to glass transition temperature, T g , in brass molds͒ from vitreous PbGeO 3 , ␣-PbF 2 ͑orthorhombic, Aldrich, 99.99%͒ and CdF 2 ͑cubic, Aldrich, 99%͒. Vitreous PbGeO 3 , was obtained from analytical purity PbO and GeO 2 well mixed and melted in Pt crucibles at 1273 K, followed by quenching to room temperature.…”

Temperature dependence of 19F NMR and ion transport parameters of fluoride ion conductors SnF2—PbF2 and 2SnF2—NH4F prepared by mechanical milling

“…The low activation energy from NMR measurements is generally ascribed to be due to a local hop of an ion and E a (NMR) is treated as the actual microscopic activation energy of ionic diffusion [30]. However the measurement of E a (NMR) from the low temperature slope of the corresponding T 1 data shall be more appropriate [31]. The value of diffusion coefficient (D) and its variation with temperature could yield information, which is essential for the understanding of the conduction mechanism in these materials.…”