2026-05-20T16:56:00Z https://icatplus.esrf.fr/oaipmh/request

oai:icatplus.esrf.fr:inv/1087745002 2023-04-11T06:57:27.144Z

4.2 EI 10.15151/ESRF-ES-1087745002 Elliot LASCELLES Elliot Lascelles Elliot LASCELLES Elliot Lascelles Gertruda ZIENIUTE Gertruda Zieniute Gertruda ZIENIUTE Gertruda Zieniute Sumit KONAR Sumit Konar 0000-0003-3156-6536 Andy FITCH Andrew Fitch 0000-0002-9768-5688 Sumit KONAR Sumit Konar 0000-0003-3156-6536 Bethany WILD Bethany Wild Bethany WILD Bethany Wild Example Institute 2026 Data from large facility measurement 2023-04-08T06:00:00Z/2023-04-11T06:00:00Z 2023-04-11T06:00:00Z I CC-BY-4.0 Solid-solid transitions occur from room temperature ordered phases to orientationally disordered high-temperature phases that lie at the boundary between liquids and solids. Solid-solid phase-change materials (SSPCMs) can be potentially used for next generation thermal energy storage devices, as they present several advantages over solid-liquid PCMs including safety (no spillage of hot liquid), lower thermal expansion, lower corrosiveness, and no need for encapsulation. Adoption of SSPCMs for practical applications require detailed understanding of both thermodynamic and kinetic disordering. The proposal will investigate two tetrafluoroborate salts with high latent heat of phase transitions. KBF4 and NaBF4 undergo order-disorder transitions at 285 ℃ and 230 ℃ with ΔH =120 J/g and 70 J/g, respectively. Variable-temperature powder x-ray diffraction (PXRD) will be conducted to elucidate long-range structural changes over many temperature cycling (heating/cooling).