Electrocaloric Effects Across Room Temperature in Multilayer Capacitors
Researchers have developed multilayer capacitors utilizing a solid solution of PbSc0.5Ta0.5O3 (PST) and PbMg0.5W0.5O3 (PMW) to achieve efficient electrocaloric refrigeration across room temperature. Published in Nature, this study addresses the limitations of existing PST-based capacitors, which typically require an energetically expensive 42-day annealing process and operate only above room temperature. By introducing PMW, the team successfully suppressed the Curie temperature to as low as 230 K while maintaining high B-site order and latent heat without annealing. The resulting devices demonstrate supercritical electrocaloric effects of approximately 3 K across and below room temperature under electric fields of 17.1 V μm−1, sustaining performance over 10 million cycles without breakdown. Ideal fluid regenerator models suggest cycle efficiencies between 70% and 90%. These findings indicate that PST-PMW multilayer capacitors offer a viable, energy-efficient alternative for solid-state cooling applications in food preservation, medicine, and climate control, potentially replacing current PST prototypes in future electrocaloric refrigeration systems.
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Electrocaloric Effects Across Room Temperature in Multilayer Capacitors
Researchers have developed multilayer capacitors utilizing a solid solution of PbSc0.5Ta0.5O3 (PST) and PbMg0.5W0.5O3 (PMW) to achieve efficient electrocaloric refrigeration across room temperature. Published in Nature, this study addresses the limitations of existing PST-based capacitors, which typically require an energetically expensive 42-day annealing process and operate only above room temperature. By introducing PMW, the team successfully suppressed the Curie temperature to as low as 230 K while maintaining high B-site order and latent heat without annealing. The resulting devices demonstrate supercritical electrocaloric effects of approximately 3 K across and below room temperature under electric fields of 17.1 V μm−1, sustaining performance over 10 million cycles without breakdown. Ideal fluid regenerator models suggest cycle efficiencies between 70% and 90%. These findings indicate that PST-PMW multilayer capacitors offer a viable, energy-efficient alternative for solid-state cooling applications in food preservation, medicine, and climate control, potentially replacing current PST prototypes in future electrocaloric refrigeration systems.
Nature