Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session S21: Energy-related Thermal Phenomena
11:15 AM–2:03 PM,
Thursday, March 5, 2020
Room: 302
Sponsoring
Unit:
GERA
Chair: Sarbajit Banerjee, Texas A&M University
Abstract: S21.00013 : Neutron studies of the structure and dynamics of barocaloric Ammonium Sulfate*
Presenter:
Helen Walker
(Rutherford Appleton Lab)
Authors:
Helen Walker
(Rutherford Appleton Lab)
Bernet Meijer
(School of Physics and Astronomy, Queen Mary University of London)
Guanqun Cai
(School of Physics and Astronomy, Queen Mary University of London)
Shurong Yuan
(School of Physics and Astronomy, Queen Mary University of London)
Franz Demmel
(Rutherford Appleton Lab)
Helen Playford
(Rutherford Appleton Lab)
Anthony Phillips
(School of Physics and Astronomy, Queen Mary University of London)
Recently a giant barocaloric effect has been demonstrated near the ferrielectric phase transition of ammonium sulfate [1], which is cheaply and widely available. The transition is associated with a symmetry change from Pnma to Pna21 at ~224 K at ambient pressure, while small changes in hydrostatic pressure drive giant inverse barocaloric effects near the ferrielectric phase transition.
The phase transition in (NH4)2SO4 has been extensively studied, including crystallographic, Raman, reflectivity, NMR and infrared investigations, yet its exact nature is surprisingly still a matter of debate. We will present our neutron scattering experiments (total scattering, INS and QENS) probing the structure and dynamics of this material, which aim to identify the characteristics responsible for its exceptional barocaloric behaviour; and hence create a roadmap to develop new barocaloric materials and optimise their properties.
[1] Lloveras et al., Nat. Comm. 6, 8801 (2015)
*Work supported by EPSRC grant EP/S03577X/1
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