Effect of High Pressure and High Temperature on the Structure and Properties of Glass, Glass-Ceramic and Other Materials

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Crystallography and Physical Chemistry of Minerals & Nanominerals".

Deadline for manuscript submissions: closed (10 April 2023) | Viewed by 2414

Special Issue Editor

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Guest Editor
Physics Institute, Federal University of Rio Grande do Sul (IF/UFRGS), Porto Alegre 90040-060, Brazil
Interests: glass; glass-ceramic; high pressure; phase transition; amorphous phase; thermal analyses; PDF; XRD; Raman; mechanical, thermal, and optical properties; biomaterials

Special Issue Information

Dear Colleagues,

When glasses are heated to the glass transition region, atomic mobility increases, leading to the formation of crystalline nuclei embedded in the amorphous matrix. Depending on the thermal treatment, these nuclei can grow and give rise to glass-ceramic materials above crystallization temperature. When subjected to pressures of the GPa order, glasses can be permanently densified and exhibit structural changes that remain after pressure is released, due to their structural freedom. High pressure and/or high-pressure/high-temperature processing of glasses can induce polyamorphism and affect the nucleation and growth of crystalline phases through changes induced in bond angles, interatomic distances, coordination number, phase formation, and change in mechanical, thermal, electrical, and optical properties. This Special Issue aims to elucidate the mechanisms of densification of vitreous systems and their effects on macroscopic properties. For this, works on glass and glass-ceramic systems at high pressure are encouraged. Examples of approaches include but are not limited to the (A) characterization of amorphous phases as a function of pressure; (B) formation of glass-ceramics; (C) characterization and experiments in high-volume systems; (D) characterization and experiments in small-volume systems; (E) use of synchrotron radiation for studies; (F) PDF, EXAFS, XRD, XRS, Raman, IR; (G) calculations and modeling; (H) theory versus experiments; (I) mechanical, thermal, electrical, magnetic, and optical properties as functions of pressure; (J) glass, glass-ceramics, and minerals; (K) instrumentation in high pressure to apply in glass-ceramics; (L) thermodynamic models.

Dr. Silvio Buchner
Guest Editor

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  • glass
  • glass-ceramic
  • high pressure
  • phase transition
  • structure
  • crystallization kinetics
  • theory and applications
  • glass transition
  • amorphous phase
  • characterization and properties

Published Papers (1 paper)

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13 pages, 2327 KiB  
Structural Features of K2O-SiO2 Melts: Modeling and High-Temperature Experiments
by Olga N. Koroleva, Mikhail V. Shtenberg and Armenak A. Osipov
Minerals 2023, 13(1), 94; https://doi.org/10.3390/min13010094 - 7 Jan 2023
Cited by 1 | Viewed by 1908
Despite numerous investigations, the thermodynamic properties of potassium silicates remain apparently contradictory. In situ experiments are complicated by the unstable behavior of a K2O–SiO2 melt in the region of compositions with a high potassium oxide content. In this paper, we [...] Read more.
Despite numerous investigations, the thermodynamic properties of potassium silicates remain apparently contradictory. In situ experiments are complicated by the unstable behavior of a K2O–SiO2 melt in the region of compositions with a high potassium oxide content. In this paper, we study the structure of melts by the method of physicochemical modeling, taking into account the results of high-temperature Raman spectroscopy. To do this, the Raman spectra were curve-fitted, taking into account the second coordination sphere of silicon atoms. From the interpretation of the spectra of K2O–SiO2 glasses and melts having a K2O content of up to 55 mol.%, quantitative characteristics of the system were obtained. Since available information on the thermodynamic properties of potassium silicates is known to be contradictory, coordinated thermodynamic characteristics of potassium silicates, some of which were evaluated, were used as input data for modeling. Structural modeling of glasses and melts of the K2O–SiO2 system was carried out across a range of compositions up to 60 mol.% potassium oxide. The database of structural units of melts of the potassium silicate system, updated according to experimental data, will find practical application in chemistry, geochemistry and engineering fields. Full article
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