Effect of a coordination change on the strength of amorphous SiO2

Details Effect of a coordination change on the strength of amorphous SiO2 Effect of a coordination change on the strength of amorphous SiO2

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988sci...241.1072m&link_type=abstract

Science (ISSN 0036-8075), vol. 241, Aug. 26, 1988, p. 1072-1074. NSF-supported research.

Computer Science

25

Amorphous Silicon, Coordination Polymers, Pressure Effects, Silicon Dioxide, Yield Strength, Earth Mantle, High Pressure, Planetary Composition, Silicon Oxides

Scientific paper

Measurements of the yield strength of SiO2 glass to pressures as high as 81 gigapascals at room temperature show that the strength of amorphous silica decreases significantly as it is compressed to denser structures with higher coordination. Above 27 gigapascals, as the silicon in amorphous SiO2 is continuously transformed from fourfold to sixfold coordination, the strength of the glass decreases by more than an order of magnitude. These data confirm theoretical predictions that the mechanical properties of polymerized amorphous silicates are sensitive to pressure-induced structural transformations and suggest that the viscosity of silica-rich liquids decreases significantly at high pressures. Such a change in melt rheology could enhance the processes of chemical differentiation with depth in the earth's mantle.

Affiliated with

Also associated with

No associations

Rating

Effect of a coordination change on the strength of amorphous SiO2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Effect of a coordination change on the strength of amorphous SiO2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effect of a coordination change on the strength of amorphous SiO2 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1696553