Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prediction of giant mechanocaloric effects in fluorite-structured
  superionic materials   Mechanocaloric materials experience a change in temperature when a mechanical
stress is adiabatically applied on them. Thus far, only ferroelectrics and
superelastic metallic alloys have been considered as potential mechanocaloric
compounds to be exploited in solid-state cooling applications. Here we show
that giant mechanocaloric effects occur in hitherto overlooked fast ion
conductors (FIC), a class of multicomponent materials in which above a critical
temperature, Ts, a constituent ionic species undergoes a sudden increase in
mobility. Using first-principles and molecular dynamics simulations, we found
that the superionic transition in fluorite-structured FIC, which is
characterised by a large entropy increase of the order of 100 J/K*Kg, can be
externally tuned with hydrostatic, biaxial or uniaxial stresses. In particular,
Ts can be reduced several hundreds of degrees through the application of
moderate tensile stresses due to the concomitant drop in the formation energy
of Frenkel pair defects. We predict that the adiabatic temperature change in
CaF2 and PbF2, two archetypal fluorite-structured FIC, close to their critical
points are of the order of 100 and 10 K, respectively. This work advocates that
FIC constitute a new family of mechanocaloric materials showing great promise
for prospective solid-state refrigeration applications.

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The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
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The categories of this paper are: eess
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
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The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: q-alg