Cooling by adiabatic (DE)pressurization - the barocaloric effect |
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Authors: | Th Strässle A Furrer |
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Institution: | Laboratory for Neutron Scattering, Eidgen?ssische Technische Hochschule Zürich and Paul Scherrer Institut , CH-5232, Villigen PSI, Switzerland |
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Abstract: | Abstract The barocaloric effect reflects a new cooling principle at low temperatures without the need of liquefied gases nor magnetic fields as used in other cooling techniques. A pressure induced structural and/or magnetic phase transition is used to obtain a significant change in the system's entropy which leads to its cooling if done adiabatically. The effect is illustrated for the two rare earth compounds Pr1 ? xLaxNio3 and Cex(La,Y)1 ? xSb using a structural and a magnetic phase transition, respectively. In situ experiments on Cex(La,Y)1?xSb are presented and reveal a cooling rate of up to 2 K per 0·5 GPa pressure change at working temperatures below 20 K for x=1 and up to 0·42 K per 0·24 GPa for x=0·85 at around 10K. |
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Keywords: | Adiabatic cooling Pressure-induced phase transitions Crystal fields High pressure Magnetoelastic effects Magnetic order |
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