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Giant Barocaloric Effect at the Spin Crossover Transition of a Molecular Crystal

Journal Article · · Advanced Materials
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  1. City University of New York (CUNY), Brooklyn, NY (United States)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. University of Leeds (United Kingdom)
  4. Heriot-Watt University, Edinburgh (United Kingdom)
+ Show Author Affiliations

Here, the first experimental evidence for a giant, conventional barocaloric effect (BCE) associated with a pressure-driven spin crossover transition near room temperature is provided. Magnetometry, neutron scattering, and calorimetry are used to explore the pressure dependence of the SCO phase transition in polycrystalline samples of protonated and partially deuterated [FeL2][BF4]2 [L = 2,6-di(pyrazol-1-yl)pyridine] at applied pressures of up to 120 MPa (1200 bar). The data indicate that, for a pressure change of only 0–300 bar (0–30 MPa), an adiabatic temperature change of 3 K is observed at 262 K or 257 K in the protonated and deuterated materials, respectively. This BCE is equivalent to the magnetocaloric effect (MCE) observed in gadolinium in a magnetic field change of 0–1 Tesla. The work confirms recent predictions that giant, conventional BCEs will be found in a wide range of SCO compounds.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); City University of New York; Professional Staff Congress; Engineering and Physical Sciences Research Council (EPSRC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1906568
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 23 Vol. 31; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
barocaloric effect
deuteration
solid-state cooling
spin crossover