Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Native point defects in $Ti_3GeC_2$ and $Ti_2GeC$   Using density functional theory, we calculated the formation energy of native
point defects (vacancies, interstitials and antisites) in MAX phase $Ti_2GeC$
and $Ti_3GeC_2$ compounds. Ge vacancy with formation energy of 2.87 eV was the
most stable defect in $Ti_2GeC$ while C vacancy with formation energy of 2.47
eV was the most stable defect in $Ti_3GeC_2$. Ge vacancies, in particular, were
found to be strong phonon scattering centres that reduce the lattice
contribution to thermal conductivity in $Ti_2GeC$. In both compounds, the
reported high thermal and electrical conductivity is attributed to the
electronic contribution that originates from the high density of states at the
Fermi level.

31
The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg