Room-temperature barocaloric effect in [Fe(pap-5NO₂)₂] spin-crossover material

Gracia, David ; Cuartero, Vera (Universidad de Zaragoza) ; Popescu, Catalin ; Trapali, Adelais ; Mallah, Talal ; Boillot, Marie-Laure ; Blasco, Javier ; Subías, Gloria ; Evangelisti, Marco

Resumen: We examine the pressure dependence of the spin-crossover transition in [Fe(pap-5NO2)2] that occurs near room temperature. We employ a combination of high-pressure calorimetry and powder X-ray diffraction measurements, conducted both under variable-pressure and variable-temperature conditions. Both methods indicate that the spin-crossover transition shifts linearly to higher temperatures with increasing pressure, while simultaneously exhibiting an increase in the width of the thermal hysteresis. We report a giant barocaloric effect, revealing isothermal entropy changes in the 70–79 J kg−1 K−1 range and adiabatic temperature changes between 20 and 26 K for a pressure change of 2.0 kbar. Although the effect diminishes under reversible conditions, it remains substantial, with values of 70 J kg−1 K−1 and 14 K, respectively.

Idioma: Inglés

DOI: 10.1039/d5ta00033e

Año: 2025

Publicado en: Journal of Materials Chemistry A (2025), [8 pp.]
ISSN: 2050-7488

Financiación: info:eu-repo/grantAgreement/ES/UZ/JIUZ-2023-CIE-05
Financiación: info:eu-repo/grantAgreement/ES/DGA/E11-23R
Financiación: info:eu-repo/grantAgreement/ES/DGA/E12-23R
Financiación: info:eu-repo/grantAgreement/ES/MICIU/CEX2023-001286-S
Financiación: info:eu-repo/grantAgreement/ES/MICIU/PID2021-124734OB-C21

Tipo y forma: Article (Published version)

Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)