Colour centre production in yttria-stabilized zirconia by X-ray and electron irradiations: effect of yttria content
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. Zr 3+ sitting in a trigonal symmetry site) were studied as...
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Published in | Philosophical magazine (Abingdon, England) Vol. 94; no. 35; pp. 4053 - 4065 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Abingdon
Taylor & Francis
12.12.2014
Taylor & Francis: STM, Behavioural Science and Public Health Titles |
Subjects | |
Online Access | Get full text |
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Summary: | 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. Zr
3+
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 Zr
3+
ions, thereby enhancing T-centre formation. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1478-6435 1478-6443 1478-6443 |
DOI: | 10.1080/14786435.2014.977369 |