Bulk crystal utilizes reversible atomic phase transition while preserving electrical pathways for waste-heat electricity generation

https://www.eurekalert.org/news-releases/1136286

"increasing electrical transport in thermoelectric materials increases unwanted heat flow hindering maintaining temperature differences for generating electricity... overcome embedding 2D iron(II) selenide directly into bulk crystal, inheriting former's high electrical power factor... heating to approximately 180°C causes reversible phase transition from iron-vacancy-ordered state to disordered state, triggering extreme phonon scattering for low lattice thermal conductivity... waste-heat recovery"