Cation Distribution in Mixed-Alkali Silicate Glasses. NMR Studies by23Na−{7Li} and23Na−{6Li} Spin Echo Double Resonance

1996 ◽  
Vol 100 (9) ◽  
pp. 3705-3712 ◽  
Author(s):  
Becky Gee ◽  
Hellmut Eckert
Keyword(s):  
Cation Distribution ◽  
Spin Echo ◽  
Double Resonance ◽  
Silicate Glasses ◽  
Nmr Studies ◽  
Mixed Alkali ◽  
Alkali Silicate

High-resolution solid-state NMR studies of mixed-alkali silicate glasses

1989 ◽  
Vol 113 (2-3) ◽  
pp. 210-212 ◽  
Author(s):  
W. Hater ◽  
W. Müller-Warmuth ◽  
M. Meier ◽  
G.H. Frischat
Keyword(s):  
Solid State ◽  
High Resolution ◽  
Solid State Nmr ◽  
Silicate Glasses ◽  
Nmr Studies ◽  
Mixed Alkali ◽  
Alkali Silicate

scholarly journals The Influence of Environment in the Alteration of the Stained-Glass Windows in Portuguese Monuments

Heritage ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 365-376 ◽  
Author(s):  
Teresa Palomar ◽  
Pedro Redol ◽  
Isabel Cruz Almeida ◽  
Eduardo Pereira da Silva ◽  
Marcia Vilarigues
Keyword(s):  
Analytical Techniques ◽  
Soda Lime ◽  
Silicate Glasses ◽  
High Humidity ◽  
Atmospheric Conditions ◽  
Stained Glass ◽  
Mixed Alkali ◽  
Alkali Silicate ◽  
High Humidity Environment ◽  
Humidity Environment

This work presents the results of the exposure of soda-lime, potash-lime and mixed-alkali silicate glasses during ten and twenty months in different Portuguese monuments with historical stained-glass windows to characterize the influence of local environmental conditions. The glass samples were exposed in the Monastery of Batalha (Batalha), the Monastery of Jerónimos (Lisbon), and the Cathedral of Évora (Évora). A set of analytical techniques to assess the physicochemical effects were used, including optical microscopy and Fourier transform infrared spectroscopy. All the samples presented crystalline deposits on their surface; however, their quantity and nature depended on the atmospheric conditions during the days before the collection. Potash-lime silicate glass was the most altered glass in comparison with soda-lime and mixed-alkali silicate glasses. The samples from the Cathedral of Évora showed a high content of dust and salts on their surface but without severe chemical pathologies; however, those samples exposed in the Monastery of Jerónimos and the Monastery of Batalha presented alteration layers due to a high humidity environment.

scholarly journals Inter-plane Coupling and Spin Gap -an NMR/NQR Look on Typical Properties of High-Temperature Superconductors

1996 ◽  
Vol 51 (5-6) ◽  
pp. 786-792
Author(s):  
D. Brinkmann
Keyword(s):  
Relaxation Time ◽  
Spin Echo ◽  
High Temperature Superconductors ◽  
Double Resonance ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Nmr Studies ◽  
Spin Gap ◽  
Spin Lattice

Abstract The paper discusses some NQR/NMR studies performed on Y-Ba-Cu-O superconductors at the University of Zürich. In particular, we review studies performed in Y2Ba4Cu7O15 by measuring various planar Cu NQR/NMR parameters: the spin-lattice relaxation time, the Knight shift and the indirect component of the Gaussian contribution to the spin-spin relaxation time. The temperature dependence of these parameters reveals a coupling between adjacent planes of a double plane. The existence of the inter-plane coupling has independently been confirmed by performing NQR Spin-Echo Double Resonance (SEDOR) experiments. The appearance of a spin gap seems to be the consequence of inter-plane coupling.

Second-Harmonic Generation from Thermally Poled Mixed Alkali Silicate Glasses Containing Various Alkaline-Earth Oxides

2000 ◽  
Vol 39 (Part 1, No. 12A) ◽  
pp. 6530-6534 ◽  
Author(s):  
Hiroyuki Nasu ◽  
Yoshiyuki Suzuki ◽  
Hiroya Ohta ◽  
Yoshitugu Yamamoto ◽  
Yusuke Ito ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Alkaline Earth ◽  
Second Harmonic ◽  
Silicate Glasses ◽  
Mixed Alkali ◽  
Alkali Silicate ◽  
Thermally Poled
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