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in creator/contributor: "Garay, J E"

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Electric Current Enhanced Point Defect Mobility in Ni3Ti Intermetallic

The effect of the application of a DC current on the annealing of point defects in Ni{sub 3}Ti was investigated by positron annihilation spectroscopy (PAS). An increased rate of point defect annealing is observed under the influence of a current and is attributed to a 24% decrease in the mobility activation energy. The results are interpreted in terms of the electron wind effect and the complex nature of diffusion in ordered intermetallic phases. This work represents the first direct evidence o… more

Date: February 5, 2004

Creator: Anselmi-Tamburini, U; Asoka-Kumar, P; Garay, J E; Munir, Z A & Glade, S C

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

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

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. … more

Date: April 5, 2005

Creator: Garay, J E; Glade, S C; Asoka-Kumar, P; Anselmi-Tamburini, U & Munir, Z A