161716 20251017144630.0 doi 10.1002/aelm.202400962 sideral 144348 ART-2025-144348 eng Lafuerza, Sara (orcid)0000-0001-8303-932X High‐quality epitaxial five‐layer aurivillius films with in‐plane ferroelectricity for electrocaloric cooling 2025 Access copy available to the general public Unrestricted High‐quality purely c‐axis oriented epitaxial thin films of the Aurivillius phase Sr2Bi4Ti5O18 with n = 5 (Sr,Bi)TiO3 perovskite‐like layers, are grown on SrTiO3 substrates by pulsed laser deposition. The highest crystalline quality is obtained with a 20 wt.% Bi‐excess target and average stacking order values in the proximity of the ideal value n = 5 are attained for an optimum deposition temperature of 650 °C. Scanning transmission electron microscopy reveals regions with n ranging from 4 to 6 around an average thickness of n = 5, in agreement with the X‐ray diffraction analysis. Interdigital electrodes are used to probe the in‐plane polarization and survey the electrocaloric properties. A maximum adiabatic temperature change of ΔT ∼ 0.95 °C for an electric field of 150 kV cm−1 is observed at ≈135 °C. Larger values are expected at higher temperatures around the ferroelectric Curie temperature, TC. Since TC of Sr2Bi4Ti5O18 can be tuned by codoping, the findings pave the way toward a large electrocaloric effect at ambient temperature. info:eu-repo/grantAgreement/ES/AEI/CEX2023-001263-S info:eu-repo/grantAgreement/ES/DGA/E11-23R info:eu-repo/grantAgreement/ES/DGA/E12-23R info:eu-repo/grantAgreement/EC/H2020/101007825/EU/ULtra ThIn MAgneto Thermal sEnsor-Ing/ULTIMATE-I This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 101007825-ULTIMATE-I info:eu-repo/grantAgreement/EC/H2020/101029019/EU/Exploring Aurivillius phases for Green Electrocaloric Refrigeration/EAGER This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 101029019-EAGER info:eu-repo/grantAgreement/ES/MICINN/CEX2021-001214-S info:eu-repo/grantAgreement/ES/MICINN/CEX2023-001286-S info:eu-repo/grantAgreement/ES/MICINN/PID2021-123276OB-I00 info:eu-repo/grantAgreement/ES/MICINN/PID2021-124734OB-C21 info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Blasco, Javier (orcid)0000-0002-9706-3272 Evangelisti, Marco (orcid)0000-0002-8028-9064 Subías, Gloria (orcid)0000-0002-9029-1977 Gracia, David Pardo, José Á. Universidad de Zaragoza (orcid)0000-0002-0111-8284 Barriuso, Eduardo Torrelles, Xavier Padilla-Pantoja, Jessica Caicedo, José M. Santiso, José 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. (2025), 2400962 [10 pp.] Adv. Electron. Mater. Advanced Electronic Materials 2199-160X 2993098 http://zaguan.unizar.es/record/161716/files/texto_completo.pdf Versión publicada 2890287 http://zaguan.unizar.es/record/161716/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:161716 articulos driver 2025-10-17-14:25:53 ARTICLE