000117279 001__ 117279 000117279 005__ 20240319080951.0 000117279 0247_ $$2doi$$a10.1149/1945-7111/ac60f2 000117279 0248_ $$2sideral$$a128961 000117279 037__ $$aART-2022-128961 000117279 041__ $$aeng 000117279 100__ $$aRobles-Fernández, A. 000117279 245__ $$aProbing high oxygen activity in YSZ electrolyte 000117279 260__ $$c2022 000117279 5060_ $$aAccess copy available to the general public$$fUnrestricted 000117279 5203_ $$aThe 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. 000117279 536__ $$9info:eu-repo/grantAgreement/ES/DGA/T02-20R$$9info:eu-repo/grantAgreement/ES/MCIU-AEI-FEDER/RTI2018-098944-J-I00$$9info:eu-repo/grantAgreement/ES/MCIU/BES-2016-078508$$9info:eu-repo/grantAgreement/ES/MCIU/RYC2018-025553-I$$9info:eu-repo/grantAgreement/ES/MCIN/AEI/10.13039/501100011033 000117279 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/ 000117279 590__ $$a3.9$$b2022 000117279 592__ $$a0.954$$b2022 000117279 591__ $$aMATERIALS SCIENCE, COATINGS & FILMS$$b7 / 20 = 0.35$$c2022$$dQ2$$eT2 000117279 591__ $$aELECTROCHEMISTRY$$b16 / 30 = 0.533$$c2022$$dQ3$$eT2 000117279 593__ $$aCondensed Matter Physics$$c2022$$dQ1 000117279 593__ $$aElectrochemistry$$c2022$$dQ1 000117279 593__ $$aSurfaces, Coatings and Films$$c2022$$dQ1 000117279 593__ $$aMaterials Chemistry$$c2022$$dQ1 000117279 593__ $$aElectronic, Optical and Magnetic Materials$$c2022$$dQ1 000117279 593__ $$aRenewable Energy, Sustainability and the Environment$$c2022$$dQ2 000117279 594__ $$a7.2$$b2022 000117279 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000117279 700__ $$0(orcid)0000-0001-8751-0983$$aOrera, A.$$uUniversidad de Zaragoza 000117279 700__ $$0(orcid)0000-0003-2242-6822$$aPeña, J. I.$$uUniversidad de Zaragoza 000117279 700__ $$0(orcid)0000-0003-0747-405X$$aMerino, R. I. 000117279 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal. 000117279 773__ $$g169, 4 (2022), 044503 [10 pp.]$$pJ. Electrochem. Soc.$$tJOURNAL OF THE ELECTROCHEMICAL SOCIETY$$x0013-4651 000117279 8564_ $$s1577263$$uhttps://zaguan.unizar.es/record/117279/files/texto_completo.pdf$$yVersión publicada 000117279 8564_ $$s935686$$uhttps://zaguan.unizar.es/record/117279/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000117279 909CO $$ooai:zaguan.unizar.es:117279$$particulos$$pdriver 000117279 951__ $$a2024-03-18-13:07:34 000117279 980__ $$aARTICLE