Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fragile-to-strong transition in liquid silica   We investigate anomalies in liquid silica with molecular dynamics simulations
and present evidence for a fragile-to-strong transition at around 3100 K-3300
K. To this purpose, we studied the structure and dynamical properties of silica
over a wide temperature range, finding four indicators of a fragile-to-strong
transition. First, there is a density minimum at around 3000 K and a density
maximum at 4700 K. The turning point is at 3400 K. Second, the local structure
characterized by the tetrahedral order parameter changes dramatically around
3000 K from a higher-ordered, lower-density phase to a less ordered,
higher-density phase. Third, the correlation time {\tau} changes from an
Arrhenius behavior below 3300 K to a Vogel-Fulcher-Tammann behavior at higher
temperatures. Fourth, the Stokes-Einstein relation holds for temperatures below
3000 K, but is replaced by a fractional relation above this temperature.
Furthermore, our data indicate that dynamics become again simple above 5000 K,
with Arrhenius behavior and a classical Stokes-Einstein relation.

10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol