Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: van der Waals forces stabilize low-energy polymorphism in B2O3:
  Implications for the crystallization anomaly   The cohesive energies and structural properties of recently predicted, and
never synthesized, B$_2$O$_3$ polymorphs are investigated from first principles
using density functional theory and high-accuracy many-body methods, namely,
the random phase approximation and quantum Monte Carlo. We demonstrate that the
van der Waals forces play a key role in making the experimentally known
polymorph (B$_2$O$_3$-I) the lowest in energy, with many competing metastable
structures lying only a few kcal/mol above. Remarkably, all metastable crystals
are comparable in energy and density to the glass, while having anisotropic and
mechanically soft structures. Furthermore, the best metastable polymorph
according to our stability criteria has a structural motif found in both the
glass and a recently synthesized borosulfate compound. Our findings provide new
perspectives for understanding the B$_2$O$_3$ anomalous behavior, namely, its
propensity to vitrify in a glassy structure drastically different from the
known crystal.

34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
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
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph