Dr Cazorla's article in Nano Letters
FAST-ION CONDUCTORS ARE COOL
In fast-ion conductor materials (FIC), ions are highly mobile. These compounds usually are employed as electrolytes in solid-state batteries. Above a certain critical temperature the anion or cation mobility in FIC becomes comparable to that of a molten salt. This “superionic” transition can be thought of as a sublattice melting that, in analogy to homogeneous melting, has associated a large increase in entropy and lattice parameter. Using first-principles and molecular dynamics simulations, we have found that the superionic transition in FIC can be efficiently tuned by means of external hydrostatic, biaxial, or uniaxial stresses. We have shown that this new effect is very promising for solid-state cooling applications, since large adiabatic temperature changes of the order of 10-100K can be attained close to the transition point. Our work opens an encouraging avenue for the rational design of novel refrigeration materials, which are crucially needed for improving the performance and scalability of current electronic devices.
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