The structure of MgO–SiO2 glasses at elevated pressure
@article{Wilding2012TheSO, title={The structure of MgO–SiO2 glasses at elevated pressure}, author={Martin C. Wilding and Malcolm Guthrie and Shinji Kohara and Craig L. Bull and Jaakko Akola and Mathew G. Tucker}, journal={Journal of Physics: Condensed Matter}, year={2012}, volume={24} }
The magnesium silicate system is an important geophysical analogue and neutron diffraction data from glasses formed in this system may also provide an initial framework for understanding the structure-dependent properties of related liquids that are important during planetary formation. Neutron diffraction data collected in situ for a single composition (38 mol% SiO2) magnesium silicate glass sample shows local changes in structure as pressure is increased from ambient conditions to 8.6 GPa at…
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References
SHOWING 1-10 OF 47 REFERENCES
In situ diffraction studies of magnesium silicate liquids
- Geology, Materials Science
- 2007
Primitive MgO–SiO2 liquids dominate the early history of the Earth and Terrestrial planets. The structures of these liquids and structure-dependent properties, such as viscosity and diffusion, are…
Coordination changes in magnesium silicate glasses
- Materials Science, Geology
- 2004
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…
Feasibility of in situ neutron diffraction studies of non-crystalline silicates up to pressures of 25 GPa
- Materials Science
- 2008
There is an increasing interest in the structural modifications found in liquids and amorphous systems as a function of pressure. Neutron diffraction is a key technique for determining these…
Changes in the local environment surrounding magnesium ions in fragile MgO-SiO2 liquids
- Physics
- 2010
X-ray diffraction data have been collected in situ for a series of magnesium silicate liquids between and including the two mineral compositions enstatite and forsterite (MgSiO3 and Mg2SiO4). The…
Establishing the structure of GeS2 at high pressures and temperatures: a combined approach using x-ray and neutron diffraction
- Materials ScienceJournal of physics. Condensed matter : an Institute of Physics journal
- 2009
A method is described for correcting x-ray diffraction data taken in situ under high pressure, high temperature conditions for a cylindrical sample, container and gasket geometry with a parallel incident beam and with a scattered beam that is defined using an oscillating radial collimator.
Probing of bonding changes in B2O3 glasses at high pressure with inelastic X-ray scattering
- Materials Science, Physics
- 2005
Full understanding of atomic arrangement in amorphous oxides both at ambient and high pressure is an ongoing fundamental puzzle. Whereas the structures of archetypal oxide glasses such as v-B2O3 at…
Structure of GeO(2) glass at pressures up to 8.6 GPa
- Materials Science
- 2010
The structure of GeO2 glass at pressures extending from ambient to 8.65 GPa was measured at 25 °C by using in situ neutron diffraction. The results show a gradual change in the intermediate range…
Relationship between topological order and glass forming ability in densely packed enstatite and forsterite composition glasses
- Materials ScienceProceedings of the National Academy of Sciences
- 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.
Neutron powder diffraction at pressures beyond 25 GPa
- Geology
- 1995
Full structural studies of condensed media under high pressure by neutron powder diffraction have been limited in practice to 2–3 GPa for several decades. This range is in general too small to allow…