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

被引：104

作者：

Vallone, Steven P. ^{[1
,2
]}

Tantillo, Anthony N. ^{[1
,2
]}

dos Santos, Antonio M. ^{[3
]}

Molaison, Jamie J. ^{[3
]}

Kulmaczewski, Rafal ^{[5
]}

Chapoy, Antonin ^{[4
]}

Ahmadi, Pezhman ^{[4
]}

Halcrow, Malcolm A. ^{[5
]}

Sandeman, Karl G. ^{[1
,2
]}

机构：

[1] CUNY Brooklyn Coll, Dept Phys, 2900 Bedford Ave, Brooklyn, NY 11210 USA

[2] CUNY, Phys Program, Grad Ctr, 365 Fifth Ave, New York, NY 10016 USA

[3] Oak Ridge Natl Lab, Neutron Sci Directorate, Oak Ridge, TN 37831 USA

[4] Heriot Watt Univ, Hydrates Flow Assurance & Phase Equilibria Res Gr, Inst Petr Engn, Edinburgh EH14 4AS, Midlothian, Scotland

[5] Univ Leeds, Sch Chem, Woodhouse Lane, Leeds LS2 9JT, W Yorkshire, England

来源：

ADVANCED MATERIALS | 2019年 / 31卷 / 23期

基金：

英国工程与自然科学研究理事会;

关键词：

barocaloric effect; deuteration; solid-state cooling; spin crossover; PRESSURE;

D O I：

10.1002/adma.201807334

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页数：7

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