117279 20240319080951.0 doi 10.1149/1945-7111/ac60f2 sideral 128961 ART-2022-128961 eng Robles-Fernández, A. Probing high oxygen activity in YSZ electrolyte 2022 Access copy available to the general public Unrestricted The redox behavior of terbium and praseodymium doped yttria-stabilized zirconia (YSZ) is studied. The aim is to identify spectroscopic probes and a suitable experimental procedure to monitor the oxygen activity in YSZ electrolytes in solid oxide cells with spatial resolution and at operation conditions (e.g. at high temperatures). Sintered ceramics and crystals with 0.3 to 10 at% content of Pr or Tb ions in YSZ were prepared. Upon equilibration in atmospheres from 10-20to 100 bar PO2around 800 °C, the majority of these rare earth ions are in the 3 + oxidation state. At oxygen pressures above 0.001 bar, the small proportion of Tb4+and Pr4+formed give rise to intense optical absorption around 300 500 nm and to decreased reflectance. From the reflectance measurements it is shown that the Tb4+concentration increases as PO21/4, as correspond to the trapping of the holes generated upon the oxygen incorporation as Tb4+. This competitive absorption causes a decrease of the Tb3+luminescence. A quantitative relationship of the Tb3+luminescence intensity with PO2at 800 °C has been found, which is compatible with the trapping model. The spatial resolution of the experimental procedure could be very roughly estimated of the order of 100 µm. info:eu-repo/grantAgreement/ES/DGA/T02-20R info:eu-repo/grantAgreement/ES/MCIU-AEI-FEDER/RTI2018-098944-J-I00 info:eu-repo/grantAgreement/ES/MCIU/BES-2016-078508 info:eu-repo/grantAgreement/ES/MCIU/RYC2018-025553-I info:eu-repo/grantAgreement/ES/MCIN/AEI/10.13039/501100011033 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 3.9 2022 MATERIALS SCIENCE, COATINGS & FILMS 7 / 20 = 0.35 2022 Q2 T2 ELECTROCHEMISTRY 16 / 30 = 0.533 2022 Q3 T2 0.954 2022 Condensed Matter Physics 2022 Q1 Electrochemistry 2022 Q1 Surfaces, Coatings and Films 2022 Q1 Materials Chemistry 2022 Q1 Electronic, Optical and Magnetic Materials 2022 Q1 Renewable Energy, Sustainability and the Environment 2022 Q2 7.2 2022 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Orera, A. Universidad de Zaragoza (orcid)0000-0001-8751-0983 Peña, J. I. Universidad de Zaragoza (orcid)0000-0003-2242-6822 Merino, R. I. (orcid)0000-0003-0747-405X 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 169, 4 (2022), 044503 [10 pp.] J. Electrochem. Soc. JOURNAL OF THE ELECTROCHEMICAL SOCIETY 0013-4651 1577263 http://zaguan.unizar.es/record/117279/files/texto_completo.pdf Versión publicada 935686 http://zaguan.unizar.es/record/117279/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:117279 articulos driver 2024-03-18-13:07:34 ARTICLE