Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First-Principles Theory of Competing Order Types, Phase Separation, and
  Phonon Scattering in Thermoelectric Pb-Sb-Ag-Te Alloys   Using a first-principles cluster expansion, we shed light on the solid-state
phase diagram and structure of the recently discovered high-performance
thermoelectrics, Pb-Ag-Sb-Te alloys. The observed nanoscale inhomogeneities are
shown to be coherent precipitates of ordered (Ag)m(Sb)n(Te)m+n phases, such as
AgSbTe2, all immiscible with rocksalt PbTe. The solubility is high for PbTe in
AgSbTe2 and low for (Ag,Sb)Te in PbTe (8% vs. 0.6% at 850 K). The differences
in the phonon spectra of PbTe and AgSbTe2 confirm that the inhomogeneities
enhance the thermoelectric performance.

15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess