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Mechanocaloric effects in superionic thin films from atomistic simulations.

Arun K Sagotra^1,2, Daniel Errandonea³, Claudio Cazorla^4,5

¹School of Materials Science and Engineering, UNSW Australia, Sydney, NSW, 2052, Australia.

Nature Communications

|October 19, 2017

Summary

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Giant mechanocaloric effects were discovered in fast-ion conductors like silver iodide and Li-rich materials. These findings suggest potential for efficient solid-state cooling using abundant materials.

Area of Science:

Solid-state physics
Materials science
Thermodynamics

Background:

Solid-state cooling offers energy-efficient and scalable refrigeration.
Mechanocaloric effect, driven by mechanical stress, has high cooling potential.
Fast-ion conductors are widely used in electrochemical applications.

Purpose of the Study:

To investigate giant mechanocaloric effects in fast-ion conductors.
To explore the potential of Li-rich and type-I materials for solid-state cooling.
To understand the impact of ionic vacancies on cooling performance.

Main Methods:

Atomistic simulations were performed on thin films of Li-rich (Li3OCl) and type-I (AgI) materials.
Biaxial stress was applied to simulate mechanocaloric effects.

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The adiabatic temperature shift and cooling capacity were calculated.

Main Results:

Silver iodide (AgI) exhibited an adiabatic temperature shift of 38 K at room temperature under 1 GPa biaxial stress.
Li3OCl showed a cooling capacity of 9 K under similar conditions but at higher temperatures.
Ionic vacancies were found to negatively impact the cooling performance of superionic thin films.

Conclusions:

Fast-ion conductors, specifically AgI and Li3OCl, demonstrate significant mechanocaloric effects.
These materials present a promising avenue for developing efficient solid-state cooling technologies.
Further experimental research into superionic materials for mechanocaloric applications is warranted.