Accession Number : AD0710303

Title :   DEFECT STATES IN GLASSY AND CRYSTALLINE SILICATES.

Descriptive Note : Final summary rept. 1 Aug 65-30 Nov 69,

Corporate Author : MELLON INST PITTSBURGH PA

Personal Author(s) : Mackey,John H. , Jr

Report Date : NOV 1969

Pagination or Media Count : 15

Abstract : The objective of the research was to determine the basic chemical properties and structure of localized defects in simple glassy and crystalline silicates. The principal tools used in these studies were optical spectroscopy and paramagnetic Resonance (EPR). The results which are summarized were as follows: The type of charge trapped by the centers responsible for the principal optical absorption bands in irradiated sodium silicate glasses of high purity were determined; The emission and absorption characteristics of Eu(+2) and Eu(+3) were examined and used to study the redox properties of this couple in sodium silicate glasses and fused silica; The chemical incorporation of nitrogen into simple silicate glasses under reducing conditions was studied; The EPR spectra of simple organo-silicon compounds contraining C, N, O, and H were studied after x- and UV-irradiation to determine the nature of the radicals formed in the solid state; The types of defects associated with substitutional aluminum in glassy and crystalline varieties of SiO2 have been examined by EPR spectroscopy. (Author)

Descriptors :   (*SILICATES, *CRYSTAL DEFECTS), (*QUARTZ, CRYSTAL DEFECTS), GLASS, IMPURITIES, RADIATION CHEMISTRY, PARAMAGNETIC RESONANCE, EUROPIUM, ULTRAVIOLET RADIATION, FREE RADICALS, METALORGANIC COMPOUNDS, ALUMINUM COMPOUNDS

Subject Categories : Physical Chemistry
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE