%0 Journal Article %T Colour centre production in yttria-stabilized zirconia by X-ray and electron irradiations: effect of yttria content %+ Service des Recherches Métallurgiques Appliquées (SRMA) %+ CNR Institute for Photonics and Nanotechnologies (IFN) %+ Laboratoire des Solides Irradiés (LSI) %A Costantini, Jean-Marc %A Fasoli, Mauro %A Beuneu, François %A Boizot, Bruno %< avec comité de lecture %@ 1478-6443 %J Philosophical Magazine %I Taylor & Francis: STM, Behavioural Science and Public Health Titles %V 94 %N 35 %P 4053 %8 2014 %D 2014 %R 10.1080/14786435.2014.977369 %K yttria-stabilized zirconia %K X-ray irradiation %K electron irradiation %K colour centres %K optical absorption spectroscopy %K electron paramagnetic spectroscopy %Z Chemical Sciences/Material chemistryJournal articles %X Yttria-stabilized zirconia (YSZ) single crystals (for 9.5 and 18 mol% yttria)were irradiated at room temperature (RT) by X-rays (W white spectrum) and2.5-MeV electrons. The growth curves of the so-called T-centre (for trigonalcentre, i.e. Zr3+ sitting in a trigonal symmetry site) were studied as a functionof absorbed dose, or irradiation time, by UV–visible optical absorption (OA)spectroscopy and X-band electron paramagnetic resonance spectroscopy. Thedefect concentration at saturation and the production rate are increased by afactor around two for 18 mol% yttria with respect to 9.5 mol%. Defect decaywas then followed after irradiation by OA spectroscopy as a function ofageing time at RT. Growth and decay curves of the T-centre are modelled onthe basis of rate equations of charge-exchange reactions with the zirconiumlattice ions. Increase in yttrium content is thought to decrease hole trappingon Zr3+ ions, thereby enhancing T-centre formation. %G English %L cea-01120995 %U https://cea.hal.science/cea-01120995 %~ CEA %~ X %~ CNRS %~ X-LSI %~ X-DEP %~ X-DEP-PHYS %~ DEN %~ DEN-SACLAY %~ IRAMIS %~ GS-PHYSIQUE