Characterization of Densified Fully-Stabilized Nanometric Zirconia by Positron Annihilation Spectroscopy

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Fully-stabilized nanometric zirconia samples with varying degrees of porosity and grain sizes were analyzed using the coincidence Doppler broadening mode of the positron annihilation spectroscopy (PAS). A decrease in the low momentum fraction was observed and coincided with a decrease in porosity. In addition to pores, it is proposed that defects in the negatively charges grain boundary space region act as positron trapping centers; their effectiveness decreases with an increase in grain size. It is shown that PAS is sensitive to small grain size differences within the nanometric regime in these oxide materials.

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PDF-file: 27 pages; size: 0.3 Mbytes

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Garay, J E; Glade, S C; Asoka-Kumar, P; Anselmi-Tamburini, U & Munir, Z A April 5, 2005.

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Fully-stabilized nanometric zirconia samples with varying degrees of porosity and grain sizes were analyzed using the coincidence Doppler broadening mode of the positron annihilation spectroscopy (PAS). A decrease in the low momentum fraction was observed and coincided with a decrease in porosity. In addition to pores, it is proposed that defects in the negatively charges grain boundary space region act as positron trapping centers; their effectiveness decreases with an increase in grain size. It is shown that PAS is sensitive to small grain size differences within the nanometric regime in these oxide materials.

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PDF-file: 27 pages; size: 0.3 Mbytes

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  • Journal Name: Journal of Applied Physics; Journal Volume: 99

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  • Report No.: UCRL-JRNL-211138
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 877771
  • Archival Resource Key: ark:/67531/metadc879102

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  • April 5, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 22, 2016, 10:13 p.m.

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Garay, J E; Glade, S C; Asoka-Kumar, P; Anselmi-Tamburini, U & Munir, Z A. Characterization of Densified Fully-Stabilized Nanometric Zirconia by Positron Annihilation Spectroscopy, article, April 5, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc879102/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.