Journal ArticleDOI
Entropy of calcium and magnesium aluminosilicate glasses
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TLDR
The residual entropy of quenched Mg 2 Al 4 Si 5 O 18 glass was found to be 94 ± 13 J mol −1 K −1, and above ∼ 150 K, available data show that C p is an additive function of composition to within ± 0.5% throughout the investigated glass-forming part of the system as mentioned in this paper.About:
This article is published in Chemical Geology.The article was published on 1996-06-07. It has received 22 citations till now. The article focuses on the topics: Calcium aluminosilicate & Aluminosilicate.read more
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Structure and dynamics of magnesium in silicate melts; a high-temperature 25 Mg NMR study
A.M. George,Jonathan F. Stebbins +1 more
TL;DR: In this paper, the authors used spin-lattice relaxation times to obtain correlation times for the motion responsible for the relaxation of the 25Mg signal in the melt and showed that the correlation times obtained in this manner are very similar to the correlation time tshear obtained from viscosity measurements.
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The structure of crystals, glasses, and melts along the CaO-Al2O3 join: Results from Raman, Al L- and K-edge X-ray absorption, and 27Al NMR spectroscopy
TL;DR: Using X-ray absorption at the Al K and L -edges, Raman and 27 Al NMR spectroscopies, the authors determined the structural surroundings of Al in glasses, crystals, and melts in this binary system.
Journal ArticleDOI
Boson peak, heterogeneity and intermediate-range order in binary SiO 2 -Al 2 O 3 glasses.
Mariana Fatobene Ando,Omar Benzine,Zhiwen Pan,Jean-Luc Garden,Katrin Wondraczek,Stephan Grimm,Kay Schuster,Lothar Wondraczek +7 more
TL;DR: It is proved that mild alumina doping increases structural homogeneity on molecular scale using low-temperature heat capacity data and the Raman coupling coefficient is obtained.
Journal ArticleDOI
Heat capacity, viscosity, and configurational entropy of alkali titanosilicate melts
TL;DR: In this article, the heat capacities of three sodium and potassium titanosilicate glasses and melts have been determined between room temperature and 1800 K. The viscosities measured for these and two other melts indicate that, as embodied by the Adam-Gibbs theory of relaxation processes, the considerable decrease of the melt configurational entropy results in a dramatic viscosity increase near the glass transition range.
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Thermochemistry of nuclear waste glasses: an experimental determination
TL;DR: In this article, the Gibbs free energy of formation of a glass can be determined experimentally from a comprehensive, consistent set of measurements, and the structural and thermochemical implications of the results are discussed in terms of shortrange order and mixing of BO3 and BO4 units.
References
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ReportDOI
Thermodynamic Properties of Minerals and Related Substances at 298.15 K and 1 Bar (105 Pascals) Pressure and at Higher Temperatures
TL;DR: A report about values for the entropy, molar volume, and for the enthalpy and Gibbs energy of formation for the elements and minerals and substances at 298.15 K was given in this paper.
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Anomalous low-temperature thermal properties of glasses and spin glasses
TL;DR: In this article, a linear specific heat at low temperatures for glass follows naturally from general considerations on the glassy state, and the experimentally observed anomalous low-temperature thermal conductivity is predicted.
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Topics in Current Physics
TL;DR: In this article, Hess et al. discuss photoacoustic, photothermal, and photochemical processes at surfaces and in thin films, with contributions by A.P. Hess, L. C. Konstantinov, A.C. Tarn, F. Matthias, R. M. Miller, U. Netzelmann, E. Neubrand, J. W. Pelzl, and E. Träger.
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Low-frequency modes in vitreous silica
TL;DR: The results show that additional harmonic excitations coexist with sound waves below 1 THz, and that these excitations correspond to relative rotation of ${\mathrm{SiO}}_{4}$ tetrahedra.
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Thermodynamic properties of quartz, cristobalite and amorphous SiO2: drop calorimetry measurements between 1000 and 1800 K and a review from 0 to 2000 K
TL;DR: In this paper, relative enthalpy measurements on quartz, cristobalite and amorphous SiO2 between 1000 and 1800 K were reported, and the authors derived a consistent set of thermodynamic data for these phases.