Tunable electrocaloric effect in lead scandium tantalate through calcium doping [* Cross-Reference *]

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Youri Nouchokgwe; Natalya S. Fedorova; Veronika Kovacova; Veronika Kovacova; Ivana Gorican; Silvo Drmovsek; Binayak Mukherjee; Uroš Prah; Michele Melchiorre; Torsten Granzow; Uros Prah; Guillaume F. Nataf; Jorge Íñiguez-González; Mael Guennou; Hana Uršič; Jorge Íñiguez-González; Emmanuel Defaÿ, 2026, "Tunable electrocaloric effect in lead scandium tantalate through calcium doping [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.K8AFD5, LIST Open Repository, V1
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Description
State-of-the-art electrocaloric cooling prototypes rely on the conventional electrocaloric effect of ferroelectric lead scandium tantalate (PbSc0.5Ta0.5O3, PST), which peaks near room temperature. Here, we demonstrate that A-site calcium doping in highly ordered PST modifies its phase transitions and enables precise tuning of the electrocaloric response. The transition temperature shifts down to 258 K and up to 319 K, depending on Ca concentration. Calorimetry under electric field, electrical polarization loops, and piezoresponse force microscopy reveal the emergence of an intermediate antiferroelectric phase stabilized for Ca ≥ 2%. These results are supported by first-principles calculations. We observe conventional electrocaloric effect for Ca ≤ 2% and inverse electrocaloric effect at higher doping (≥ 2%). Under an applied field of 110 kV cm−1, Ca-doped PST exhibits an adiabatic temperature change of 2 K over a range from 263 K to 353 K. Such Ca-doped PST compounds could be used to expand the temperature range of PST below the freezing point of water. Our results offer a pathway to cascaded electrocaloric cooling devices with extended operating spans. (2026-04-15)
***This entry has been automatically imported via OpenAlex by LIST harvest scripts. Please refer to https://doi.org/10.1038/s41467-026-71911-0 for the original and latest version of the publication*** (2026-07-01)
Subject Engineering; Physics
Keyword Antiferroelectricity, Scandium, Materials science, Doping, Tantalate, Phase (matter), Lead (geology), Calcium, Ferroelectricity, Chemistry, Optoelectronics, Metallurgy, Geology, Dielectric
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