The static structure factor of amorphous silicon and vitreous silica

Details The static structure factor of amorphous silicon and vitreous silica The static structure factor of amorphous silicon and vitreous silica

2009-09-14

arxiv.org/abs/0909.2457v1

Physics

Condensed Matter

Soft Condensed Matter

22 pages

Scientific paper

Liquids are in thermal equilibrium and have a non-zero static structure factor S(Q->0) = [-^2]/ = rho*k_B*T*Chi_T where rho is the number density, T is the temperature, Q is the scattering vector and Chi_T is the isothermal compressibility. The first part of this result involving the number N (or density) fluctuations is a purely geometrical result and does not involve any assumptions about thermal equilibrium or ergodicity and so is obeyed by all materials. From a large computer model of amorphous silicon, local number fluctuations extrapolate to give S(0) = 0.035+/-0.001. The same computation on a large model of vitreous silica using only the silicon atoms and rescaling the distances gives S(0) = 0.039+/-0.001, which suggests that this numerical result is robust and similar for all amorphous tetrahedral networks. For vitreous silica, we find that S(0) = 0.116+/-0.003, close to the experimental value of S(0) = 0.0900+/-0.0048 obtained recently by small angle neutron scattering. More detailed experimental and modelling studies are needed to determine the relationship between the fictive temperature and structure.

Affiliated with

Also associated with

No associations

Rating

The static structure factor of amorphous silicon and vitreous silica 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 The static structure factor of amorphous silicon and vitreous silica, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The static structure factor of amorphous silicon and vitreous silica will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-564079