Correlation between cation order/disorder and the electrocaloric effect in the MLCCs of complex perovskite ferroelectrics

Yongke Yan, Liwei D. Geng, Li Qian Cheng, Xiaotian Li, Haoyang Leng, Ke Wang, Bed Poudel, Amin Nozariasbmarz, Mohan Sanghadasa, Susan Trolier-McKinstry, Qi Ming Zhang, Yu U. Wang, Shashank Priya

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The physical properties (dielectric, ferroelectric, piezoelectric, etc.) of complex perovskite ferroelectrics depend on the degree of order/disorder and the scale of the ordered domains. In this study, the electrocaloric (EC) properties of three representative complex perovskite ferroelectrics, Pb(Mg1/3Nb2/3)O3–8PbTiO3 (PMN-8PT), 1mol% Sm-doped Pb(Mg1/3Nb2/3)O3–8PbTiO3 (1S-PMN-8PT) and Pb(Sc1/2Ta1/2)O3 (PST) are evaluated. Multi-layer ceramic capacitors (MLCCs) with identical structural configurations were fabricated for these three compounds, and their EC properties were characterized by direct measurement using a thermocouple. The EC temperature change ΔT of PMN-8PT, 1S-PMN-8PT and PST MLCCs under 20 V μm−1 at room temperature were found to be 1.42 K, 1.54 K, and 3.10 K, respectively. X-ray diffraction and high-resolution transmission electron microscopy data suggests that the high EC performance of PST is related to the ordering of B-site cations (Sc3+ and Ta5+) with the ordering parameter S = 0.82 and a long coherence length of ∼100 nm, such that the sample transitioned from a relaxor ferroelectric to a normal ferroelectric. These results provide pathway towards design of high performance EC materials required for solid state refrigeration and air-conditioning technologies.

Original languageEnglish (US)
Article number118990
JournalActa Materialia
StatePublished - Aug 1 2023
Externally publishedYes

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  • Complex perovskite ferroelectrics
  • Disorder
  • Electrocalorics
  • Multi-layer ceramic capacitors


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