منابع مشابه
Ultrahigh-pressure polyamorphism in GeO2 glass with coordination number >6.
Knowledge of pressure-induced structural changes in glasses is important in various scientific fields as well as in engineering and industry. However, polyamorphism in glasses under high pressure remains poorly understood because of experimental challenges. Here we report new experimental findings of ultrahigh-pressure polyamorphism in GeO2 glass, investigated using a newly developed double-sta...
متن کاملX-ray absorption spectroscopy of GeO2 glass to 64 GPa.
The structural behavior of GeO2 glass has been investigated up to 64 GPa using results from x-ray absorption spectroscopy in a diamond anvil cell combined with previously reported density measurements. The difference between the nearest Ge-O distances of glassy and rutile-type GeO2 disappears at the Ge-O distance maximum at 20 GPa, indicating completion of the tetrahedral-octahedral transition ...
متن کاملEffects of a Distribution of Volume Relaxation Times in the Annealing of Bse Glass
The inAu ence of a di s tribution of relaxation times is studied in annealing ex pe rim ents . A twore la xation tim e mode l is proposed , whic h pe rmits th e ca lculatio n of the di stribution o f relaxation times from the c rossover data of Spinn e r and Napolitano as we ll as that of Ritland. This mode l al so characte ri zes th e struc ture of any glass in te rms of two parame te rs . Thu...
متن کاملGeneralized spin-glass relaxation.
Spin relaxation close to the glass temperature of CuMn and AuFe spin glasses is shown, by neutron spin echo, to follow a generalized exponential function which explicitly introduces hierarchically constrained dynamics and macroscopic interactions. The interaction parameter is directly related to the normalized Tsallis nonextensive entropy parameter q and exhibits universal scaling with reduced ...
متن کاملOn the Dynamic Characteristic of Thermoelastic Waves in Thermoelastic Plates with Thermal Relaxation Times
In this paper, analysis for the propagation of general anisotropic media of finite thickness with two thermal relaxation times is studied. Expression of displacements, temperature, thermal stresses, and thermal gradient for most general anisotropic thermoelastic plates of finite thickness are obtained in the analysis. The calculation is then carried forward for slightly more specialized case of...
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ژورنال
عنوان ژورنال: Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
سال: 1968
ISSN: 0022-4332
DOI: 10.6028/jres.072a.034