Colour centre production in yttria-stabilized zirconia by X-ray and electron irradiations: effect of yttria content - Archive ouverte HAL Access content directly
Journal Articles Philosophical Magazine Year : 2014

Colour centre production in yttria-stabilized zirconia by X-ray and electron irradiations: effect of yttria content

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Abstract

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) and 2.5-MeV electrons. The growth curves of the so-called T-centre (for trigonal centre, i.e. Zr3+ sitting in a trigonal symmetry site) were studied as a function of absorbed dose, or irradiation time, by UV–visible optical absorption (OA) spectroscopy and X-band electron paramagnetic resonance spectroscopy. The defect concentration at saturation and the production rate are increased by a factor around two for 18 mol% yttria with respect to 9.5 mol%. Defect decay was then followed after irradiation by OA spectroscopy as a function of ageing time at RT. Growth and decay curves of the T-centre are modelled on the basis of rate equations of charge-exchange reactions with the zirconium lattice ions. Increase in yttrium content is thought to decrease hole trapping on Zr3+ ions, thereby enhancing T-centre formation.
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Dates and versions

cea-01120995 , version 1 (27-02-2015)

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Jean-Marc Costantini, Mauro Fasoli, François Beuneu, Bruno Boizot. Colour centre production in yttria-stabilized zirconia by X-ray and electron irradiations: effect of yttria content. Philosophical Magazine, 2014, 94 (35), pp.4053. ⟨10.1080/14786435.2014.977369⟩. ⟨cea-01120995⟩
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