Latent heat thermal storage of solid-state phase transition in thermally stabilized hexagonal FeS

Large amounts of heat are required in areas such as food processing and textile industries to maintain equipment in the medium-temperature zone 393-573 K. However, thermal storage materials that work at this temperature are rare. Hexagonal iron sulfide FeS exhibits a solid-state phase transition at 420 K, accompanied by a high entropy change. The quenched FeS is unstable when subjected to a thermal cycling test, and the related entropy change declines. A secondary hexagonal phase with Fe deficiency was confirmed by neutron powder diffractions. Annealing FeS at temperatures slightly higher than Tt can accelerate the formation of the secondary phase. Once the sample is stabilized, the entropy change is no longer changeable. The thermally stabilized FeS sample exhibits a relatively high thermal storage density up to 136 J/cm3. This work suggests a new solid candidate for the application of solid-state phase transition latent heat energy storage in the medium-temperature region.

Automated summary

Large amounts of heat are needed in industries such as food processing and textiles to maintain equipment in the medium-temperature range of 393-573 K. However, there are few thermal storage materials that work at this temperature. Hexagonal iron sulfide FeS undergoes a solid-state phase transition at 420 K with a high entropy change. A secondary hexagonal phase with Fe deficiency is formed when FeS is annealed at slightly higher temperatures. The thermally stabilized FeS sample exhibits a high thermal storage density, making it a potential candidate for solid-state phase transition latent heat energy storage in the medium-temperature region.