Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self-passivation of vacancies in \alpha-PbO   We introduce a self-passivation of single lead (Pb) and oxygen (O) vacancies
in the \alpha-PbO compound through formation of a Pb-O vacancy pair. The
preferential mechanism for pair formation involves initial development of the
single Pb vacancy which, by weakening the covalent bonding, sets up the crystal
lattice for an appearance of the O vacancy. Binding of the Pb and O vacancies
occurs through the ionization interactions. Since no dangling bonds appear at
the Pb-O pair site, this defect has a minor effect on the electronic
properties. In such, vacancy self-passivation offers a practical way to improve
the transport properties in thermally grown PbO layers.

3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn