Authors: L G Jacobsohn K Serivalsatit C A Quarles J Ballato
Publish Date: 2015/02/07
Volume: 50, Issue: 8, Pages: 3183-3188
Abstract
025 at Erdoped Sc2O3 transparent ceramics fabricated using the twostep sintering method with different combinations of sintering temperatures were investigated by positron annihilation spectroscopy Analysis of the broadening of the annihilation photopeak revealed the presence of the same type of defect in all samples The lack of long lifetimes τ ≥ 2 ns suggested no positronium formation or the lack of trapping sites large enough to trap positronium for long enough time for the annihilation to be observed Analysis of positron annihilation lifetime revealed the presence of a single lifetime that ranged from 208 to 219 ps depending on the sintering conditions These results also suggest the absence of a significant presence of vacancy clusters and other larger openvolume defects and that the dominant openvolume defect corresponds to monovacancies and/or complex defects associated with monovacancies The bulk lifetime of Erdoped scandia is estimated to be equal or lower than 208 psThe authors acknowledge financial support from the US Department of Defense Joint Technology Office through their High Energy Laser Multidisciplinary Research Initiative HELMRI Program for Project ‘‘EyeSafe Polycrystalline Lasers’’ AFOSR Contract FA95500710566 This material is based upon work supported by the National Science Foundation under Grant No 1207080
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