Accession Number : AD0691138

Title :   EFFECTS OF 60Co GAMMA IRRADIATION UPON YVO4, YVO4:Eu(3+), AND YVO4:No(3+).

Descriptive Note : Final rept.,

Corporate Author : NORTH CAROLINA STATE UNIV RALEIGH PHYSICAL SCIENCE RESEARCH

Personal Author(s) : Smith,Bennett Michael

Report Date : JUN 1969

Pagination or Media Count : 79

Abstract : The absorption and fluorescent spectra of single crystals of YVO4, YVO4:Eu(3+) are discussed and illustrated, and the effects of 60Co gamma irradiation upon the spectra are presented. Irradiation produced similar changes in the absorption coefficient of these crystals. Small center bands were formed in the ultraviolet and visible regions. The intensity of the fluorescent emission form both YVO4 and YVO4:Eu(3+) was decreased by irradiation, while the emission intensity of YVO4:Nd(3+) was not affected. Speculations about the nature of the mechanisms producing the irradiation effects discussed. Gamma irradiation produces ionization in crystals, and some of the free electrons and holes created become trapped at lattice defects. The changes in emission and absorption in the YVO4 crystals are interpreted as due to the trapped holes and electrons. (Author)

Descriptors :   (*YTTRIUM COMPOUNDS, *FLUORESCENCE), (*RADIATION CHEMISTRY, YTTRIUM COMPOUNDS), (*VANADATES, FLUORESCENCE), DOPING, GAMMA RAYS, SINGLE CRYSTALS, EUROPIUM, IONIZATION, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA, MOLECULAR ENERGY LEVELS, CRYSTAL DEFECTS, NEODYMIUM

Subject Categories : Radiation and Nuclear Chemistry
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE