|
1
|
Vallone SP, Tantillo AN, Dos Santos AM, Molaison JJ, Kulmaczewski R, Chapoy A, Ahmadi P, Halcrow MA, Sandeman KG. Giant Barocaloric Effect at the Spin Crossover Transition of a Molecular Crystal. Adv Mater 2019; 31:e1807334. [PMID: 30985035 DOI: 10.1002/adma.201807334] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 02/22/2019] [Indexed: 06/09/2023]
Abstract
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.
Collapse
Affiliation(s)
- Steven P Vallone
- Department of Physics, Brooklyn College, CUNY, 2900 Bedford Avenue, Brooklyn, NY, 11210, USA
- Physics Program, The Graduate Center, CUNY, 365 Fifth Avenue, New York, NY, 10016, USA
| | - Anthony N Tantillo
- Department of Physics, Brooklyn College, CUNY, 2900 Bedford Avenue, Brooklyn, NY, 11210, USA
- Physics Program, The Graduate Center, CUNY, 365 Fifth Avenue, New York, NY, 10016, USA
| | - António M Dos Santos
- Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6393, USA
| | - Jamie J Molaison
- Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6393, USA
| | - Rafal Kulmaczewski
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Antonin Chapoy
- Hydrates, Flow Assurance & Phase Equilibria Research Group, Institute of Petroleum Engineering, Heriot-Watt University, EH14 4AS, Edinburgh, UK
| | - Pezhman Ahmadi
- Hydrates, Flow Assurance & Phase Equilibria Research Group, Institute of Petroleum Engineering, Heriot-Watt University, EH14 4AS, Edinburgh, UK
| | - Malcolm A Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Karl G Sandeman
- Department of Physics, Brooklyn College, CUNY, 2900 Bedford Avenue, Brooklyn, NY, 11210, USA
- Physics Program, The Graduate Center, CUNY, 365 Fifth Avenue, New York, NY, 10016, USA
| |
Collapse
|