Asymmetry of defect-induced Raman spectra in yttria-stabilized zirconia

Semjonow, A.Je.; Anastassakis, E.

doi:10.1016/0378-4371(93)90443-8

Cited by 9 publications

(1 citation statement)

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“…At the same time, we cannot rule out that the broadening might also be due to a distribution of trap frequency factors (s), since A is proportional to s in equation ( 2) [15]. Evidence of such a disorder in the oxygen sublattice of YSZ is given by the weak and broad first-order Raman scattering bands [21] due to the breakdown of selection rules in a non-periodic lattice. However, no effect of this static disorder is found in the EPR lines of defects that are homogeneous (with a Lorentzian shape).…”

Section: Discussionmentioning

confidence: 98%

Thermo-stimulated luminescence of x-ray- and alpha-irradiated yttria-stabilized zirconia

Costantini¹,

Beuneu²,

Fasoli³

et al. 2011

J. Phys.: Condens. Matter

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Yttria-stabilized zirconia (ZrO2 : Y3+) single crystals (with 9.5 mol% Y2O3) were irradiated with x-rays and α particles. Thermally stimulated luminescence (TSL) data show a main broad peak centred at ∼500-550 K in the glow curves of all irradiated samples. The TSL peak maximum temperature is consistent with the characteristic recovery temperature (∼450 K) of colour centres (T centres) deduced from isochronal annealing curves measured by electron paramagnetic resonance (EPR) spectroscopy. However, the trap-depth energies (ranging between 0.8 and 1.2 eV) deduced from the initial rise of partially cleaned TSL peaks (and from a rough approximation using Urbach's formula) are much larger than the activation energies for defect recovery of 0.3 eV deduced from the EPR data. A second TSL peak centred at ∼350-450 K found in freshly irradiated samples is seen to decay substantially in aged samples. The processes involved in TSL are discussed in relation to the defect annealing processes, and available defect-level energy and TSL data.

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Section: Discussionmentioning

confidence: 98%