Barocalorics

Motivated by the need of more efficient and green refrigeration technologies, the research area of barocalorics is gaining more and more attention. The goal is clear: the substitution of established and environmentally harmful working media with materials that fulfil today’s sustainability criteria. In a barocaloric refrigerator, latent heat of a pressure induced phase transition is used to feed a thermodynamic cycle, making the phase transition thermodynamics of the working medium to the key property.

Figure 1. Schematic of the order-disorder phase transition of [(C3H7)3(CH3)N]Mn(C2N3)3.

In our group we investigate the opportunities that come with the application of ABX3 perovskite coordination networks as barocaloric working media. Perovskite coordination networks show A-site related order-disorder phase transitions as a function of temperature and pressure which is at the centre of our research interests. To understand the origin of this phase transition, and to manipulate the underlying free energy landscape to optimise their barocaloric properties is at the centre of our research interests.

Some related publications:
  • A. K. Cheetham, G. Kieslich, H.-M. H. Yeung. Thermodynamic and Kinetic Effects in the Crystallization of Metal-Organic Frameworks. Acc. Chem. Res. 2018, 51, 659-667.
  • K. T. Butler, A. Walsh, A. K. Cheetham, G. Kieslich. Organised chaos: entropy in hybrid inorganic-organic systems and other materials. Chem. Sci. 2016, 7, 6316-6324.