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Development of Nanoscale Ceramics for Advanced Power Applications

Description: Bulk structures of unstabilized ZrO{sub 2-x}, with x in the range of 0 {<=} x {<=} 0.44, at ambient pressure have been found to exist in three different structures. (monoclinic, tetragonal and cubic.). At ambient temperature and elevated pressures above 3.5 GPa, unstabilized zirconia at these same compositions is found as a fourth phase, the orthorhombic phase. Work done in this project has demonstrated that nanoscale zirconia particles containing the orthorhombic phase in addition to amo… more
Date: September 30, 1999
Creator: Leffler, Miriam & Helble, Joseph
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

CHEMISTRY OF SO2 AND DESOX PROCESSES ON OXIDE NANOPARTICLES.

Description: On bulk stoichiometric oxides, SO{sub 2} mainly reacts with the O centers to form SO{sub 3} or SO{sub 4} species that decompose at elevated temperatures. Adsorption on the metal cations occurs below 300 K and does not lead to cleavage of the S-O bonds. In bulk oxides, the occupied cation bands are too stable for effective bonding interactions with the LUMO of SO{sub 2}. The effects of quantum confinement on the electronic properties of oxide nanoparticles and the structural defects that usually… more
Date: June 30, 2006
Creator: Rodriguez, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Point Defect Cluster Formation in Iron Displacement Cascades Up to 50 keV

Description: The results of molecular dynamics displacement cascade simulations in iron at energies up to 50 keV and temperatures of 100, 600, and 900K are summarized, with a focus on the characterization of interstitial and vacancy clusters that are formed directly within the cascade. The fraction of the surviving point defects contained in clusters, and the size distributions of these in-cascade clusters have been determined. Although the formation of true vacancy clusters appears to be inhibited in iron,… more
Date: November 30, 1998
Creator: Stoller, R.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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