Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for percolation diffusion of cations and material recovery in
  disordered pyrochlore from accelerated molecular dynamics simulations   We used classical and accelerated molecular dynamics simulations to
characterize vacancy-mediated diffusion of cations in Gd$_2$Ti$_2$O$_7$
pyrochlore as a function of the disorder on the microsecond timescale. We find
that cation vacancy diffusion is slow in materials with low levels of disorder.
However, higher levels of disorder allow for fast cation diffusion, which is
then also accompanied by fast antisite annihilation and ordering of the
cations. The cation diffusivity is therefore not constant, but decreases as the
material reorders. The results suggest that fast cation diffusion is triggered
by the existence of a percolation network of antisites. This is in marked
contrast with oxygen diffusion, which showed a smooth increase of the ionic
diffusivity with increasing disorder in the same compound. The increase of the
cation diffusivity with disorder is also contrary to observations from other
complex oxides and disordered media models, suggesting a fundamentally
different relation between disorder and mass transport. These results highlight
the dynamic interplay between fast cation diffusion and the recovery of
disorder and have important implications for understanding radiation damage
evolution, sintering and aging, as well as diffusion in disorder oxides more
generally.

7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys