{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T04:56:29Z","timestamp":1767848189762,"version":"3.49.0"},"reference-count":41,"publisher":"AIP Publishing","issue":"3","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2013,7,21]]},"abstract":"<jats:p>Deliberately oxygen deficient potassium tantalate thin films were grown by RF magnetron sputtering on Si\/SiO2\/Ti\/Pt substrates. Once they were structurally characterized, the effect of oxygen vacancies on their electric properties was addressed by measuring leakage currents, dielectric constant, electric polarization, and thermally stimulated depolarization currents. By using K2O rich KTaO3 targets and specific deposition conditions, KTaO3\u2212\u03b4 oxygen deficient thin films with a K\/Ta\u2009=\u20091 ratio were obtained. Room temperature X-ray diffraction patterns show that KTaO3\u2212\u03b4 thin films are under a compressive strain of 2.3% relative to KTaO3 crystals. Leakage current results reveal the presence of a conductive mechanism, following the Poole-Frenkel formalism. Furthermore, dielectric, polarization, and depolarization current measurements yield the existence of a polarized state below Tpol\u2009\u223c\u2009367\u2009\u00b0C. A Cole-Cole dipolar relaxation was also ascertained apparently due to oxygen vacancies induced dipoles. After thermal annealing the films in an oxygen atmosphere at a temperature above Tpol, the aforementioned polarized state is suppressed, associated with a drastic oxygen vacancies reduction emerging from annealing process.<\/jats:p>","DOI":"10.1063\/1.4813324","type":"journal-article","created":{"date-parts":[[2013,7,15]],"date-time":"2013-07-15T22:19:06Z","timestamp":1373926746000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":5,"title":["Induced polarized state in intentionally grown oxygen deficient KTaO3 thin films"],"prefix":"10.1063","volume":"114","author":[{"given":"D. A.","family":"Mota","sequence":"first","affiliation":[{"name":"IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Science of University of Porto 1 , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"given":"Y.","family":"Romaguera-Barcelay","sequence":"additional","affiliation":[{"name":"IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Science of University of Porto 1 , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"given":"A.","family":"Tkach","sequence":"additional","affiliation":[{"name":"IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Science of University of Porto 1 , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"given":"J.","family":"P\u00e9rez de la Cruz","sequence":"additional","affiliation":[{"name":"INESC TEC 2 , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"given":"P. M.","family":"Vilarinho","sequence":"additional","affiliation":[{"name":"Department of Ceramics and Glass Engineering, CICECO, University of Aveiro 3 , 3810-193 Aveiro, Portugal"}]},{"given":"P. B.","family":"Tavares","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica, Universidade de Tr\u00e1s-os-Montes e Alto Douro, Apartado 1013 4 , 5001-801 Vila Real, Portugal"}]},{"given":"J.","family":"Agostinho Moreira","sequence":"additional","affiliation":[{"name":"IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Science of University of Porto 1 , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"given":"A.","family":"Almeida","sequence":"additional","affiliation":[{"name":"IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Science of University of Porto 1 , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]}],"member":"317","published-online":{"date-parts":[[2013,7,15]]},"reference":[{"key":"2023070316385666700_c1","doi-asserted-by":"publisher","first-page":"611","DOI":"10.1016\/S0038-1098(99)00153-2","volume":"110","year":"1999","journal-title":"Solid State Commun."},{"key":"2023070316385666700_c2","doi-asserted-by":"publisher","first-page":"184104","DOI":"10.1103\/PhysRevB.64.184104","volume":"64","year":"2001","journal-title":"Phys. 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