TY - JOUR
T1 - Correlation between cation order/disorder and the electrocaloric effect in the MLCCs of complex perovskite ferroelectrics
AU - Yan, Yongke
AU - Geng, Liwei D.
AU - Cheng, Li Qian
AU - Li, Xiaotian
AU - Leng, Haoyang
AU - Wang, Ke
AU - Poudel, Bed
AU - Nozariasbmarz, Amin
AU - Sanghadasa, Mohan
AU - Trolier-McKinstry, Susan
AU - Zhang, Qi Ming
AU - Wang, Yu U.
AU - Priya, Shashank
N1 - Funding Information:
This material is based upon work supported by the Center for 3D Ferroelectric Microelectronics (3DFeM), an Energy Frontier Research Center funded by the U.S. Department of Energy , Office of Science, Office of Basic Energy Sciences Energy Frontier Research Centers program under Award Number DE-SC0021118 . B.P. acknowledges the financial support from Center for Energy Harvesting Materials and Systems. Y.Y and L.G. contributed equially to this work. We thank Dr. Haiying Wang and Dr. Ke Wang for TEM sample preparation and characterization. All microscopy work was performed at the Penn State Materials Characterization Laboratory.
Publisher Copyright:
© 2023 Acta Materialia Inc.
PY - 2023/8/1
Y1 - 2023/8/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85159152205&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85159152205&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2023.118990
DO - 10.1016/j.actamat.2023.118990
M3 - Article
AN - SCOPUS:85159152205
SN - 1359-6454
VL - 254
JO - Acta Materialia
JF - Acta Materialia
M1 - 118990
ER -