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

Steven P. Vallone, Anthony N. Tantillo, Antonio M. dos Santos, Jamie J. Molaison, Rafal Kulmaczewski, Antonin Chapoy, Pezhman Ahmadi, Malcolm A. Halcrow, Karl G. Sandeman

Research output: Contribution to journalArticle

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.
Original languageEnglish
Article number1807334
JournalAdvanced Materials
Volume31
Issue number23
Early online date15 Apr 2019
DOIs
Publication statusPublished - 6 Jun 2019

Fingerprint

Molecular crystals
Magnetocaloric effects
Gadolinium
Calorimetry
Neutron scattering
Pyridine
Phase transitions
Magnetic fields
Temperature

Keywords

  • barocaloric effect
  • deuteration
  • solid-state cooling
  • spin crossover

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Vallone, S. P., Tantillo, A. N., dos Santos, A. M., Molaison, J. J., Kulmaczewski, R., Chapoy, A., ... Sandeman, K. G. (2019). Giant Barocaloric Effect at the Spin Crossover Transition of a Molecular Crystal. Advanced Materials, 31(23), [1807334]. https://doi.org/10.1002/adma.201807334
Vallone, Steven P. ; Tantillo, Anthony N. ; dos Santos, Antonio M. ; Molaison, Jamie J. ; Kulmaczewski, Rafal ; Chapoy, Antonin ; Ahmadi, Pezhman ; Halcrow, Malcolm A. ; Sandeman, Karl G. / Giant Barocaloric Effect at the Spin Crossover Transition of a Molecular Crystal. In: Advanced Materials. 2019 ; Vol. 31, No. 23.
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Vallone, SP, Tantillo, AN, dos Santos, AM, Molaison, JJ, Kulmaczewski, R, Chapoy, A, Ahmadi, P, Halcrow, MA & Sandeman, KG 2019, 'Giant Barocaloric Effect at the Spin Crossover Transition of a Molecular Crystal', Advanced Materials, vol. 31, no. 23, 1807334. https://doi.org/10.1002/adma.201807334

Giant Barocaloric Effect at the Spin Crossover Transition of a Molecular Crystal. / Vallone, Steven P.; Tantillo, Anthony N.; dos Santos, Antonio M.; Molaison, Jamie J.; Kulmaczewski, Rafal; Chapoy, Antonin; Ahmadi, Pezhman; Halcrow, Malcolm A.; Sandeman, Karl G.

In: Advanced Materials, Vol. 31, No. 23, 1807334, 06.06.2019.

Research output: Contribution to journalArticle

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AU - Vallone, Steven P.

AU - Tantillo, Anthony N.

AU - dos Santos, Antonio M.

AU - Molaison, Jamie J.

AU - Kulmaczewski, Rafal

AU - Chapoy, Antonin

AU - Ahmadi, Pezhman

AU - Halcrow, Malcolm A.

AU - Sandeman, Karl G.

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Y1 - 2019/6/6

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AB - 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.

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Vallone SP, Tantillo AN, dos Santos AM, Molaison JJ, Kulmaczewski R, Chapoy A et al. Giant Barocaloric Effect at the Spin Crossover Transition of a Molecular Crystal. Advanced Materials. 2019 Jun 6;31(23). 1807334. https://doi.org/10.1002/adma.201807334