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Relationship between topological order and glass forming ability in densely packed enstatite and forsterite composition glasses
- S. Kohara, J. Akola, C. Benmore
- Materials ScienceProceedings of the National Academy of Sciences
- 22 August 2011
This unusual structure-property relation of Mg2SiO4 glass demonstrates that by using containerless processing it may be possible to synthesize new families of dense glasses and glass ceramics with zero porosity.
Evidence of different structures in magnesium silicate liquids : coordination changes in forsterite- to enstatite- composition glasses.
Coordination changes in magnesium silicate glasses
Glasses made from the magnesium silicate minerals enstatite (MgSiO3) and forsterite (Mg2SiO4) and three intermediate compositions can be considered as analogues of quenched melts from the Earth and…
Rhyolite magma degassing: an experimental study of melt vesiculation
Abstract The vesiculation of a peralkaline rhyolite melt (initially containing ∼0.14 wt.% H2O) has been investigated at temperatures above the rheological glass transition (Tg≈530 °C) by (a) in situ…
Pressure-induced amorphization and an amorphous–amorphous transition in densified porous silicon
Pressure-induced amorphization is observed on films of porous Si, which contains nanometre-sized domains of diamond-structured material, and it is found from Raman spectroscopy measurements that the high-density amorphous form obtained by this process transforms to low-densityAmorphous silicon upon decompression.
High-pressure transformation of SiO₂ glass from a tetrahedral to an octahedral network: a joint approach using neutron diffraction and molecular dynamics.
An atomistic model for densification is proposed in which rings are "zipped" by a pairing of five- and/or sixfold coordinated Si sites, thereby linking a parameter that is sensitive to ordering on multiple length scales to a readily measurable parameter that describes the local coordination environment.
Temperature-dependent structural heterogeneity in calcium silicate liquids
Benmore, C. J., Weber, J. K. R., Wilding, M. C., Du, J., Parise, J. B. (2010). Temperature-dependent structural heterogeneity in calcium silicate liquids. Phys. Rev. B, 82 (22). article no: 224202
Cooling rate variation in natural volcanic glasses from Tenerife, Canary Islands
Abstract Silicate melts form glasses in a variety of geological environments. The relaxation (equilibration) of the frozen glass structure provides a means of investigating the quench rates of…
Joint diffraction and modeling approach to the structure of liquid alumina
AlO4 and AlO5 units, in the approximate ratio of 2:1, with only minor fractions of AlO3 and AlO6 units. The majority of Al-O-Al connections involve corner-sharing polyhedra (83%), although a…
High-pressure x-ray scattering and computer simulation studies of density-induced polyamorphism in silicon
Wilson, M., Wilding, M. C., Daisenberger, D., Machon, D., Cabrera, R. Q. (2007). High-pressure x-ray scattering and computer simulation studies of density-induced polyamorphism in silicon. Physical…