| Numéro |
J. Phys. Colloques
Volume 41, Numéro C6, Juillet 1980
THIRD EUROPHYSICS TOPICAL CONFERENCELATTICE DEFECTS IN IONIC CRYSTALS |
|
|---|---|---|
| Page(s) | C6-520 - C6-521 | |
| DOI | https://doi.org/10.1051/jphyscol:19806136 | |
THIRD EUROPHYSICS TOPICAL CONFERENCE
LATTICE DEFECTS IN IONIC CRYSTALS
J. Phys. Colloques 41 (1980) C6-520-C6-521
DOI: 10.1051/jphyscol:19806136
Department of Physics, Indian Institute of Technology, Madras-600 036, India
LATTICE DEFECTS IN IONIC CRYSTALS
J. Phys. Colloques 41 (1980) C6-520-C6-521
DOI: 10.1051/jphyscol:19806136
On the luminescence of RbI : Pb2+ at liquid helium temperature
S. B. S. Sastry et S. SapruDepartment of Physics, Indian Institute of Technology, Madras-600 036, India
Abstract
Results on polarized luminescence measurements made on RbI : Pb2+ at 4.7 K and optical absorption between LHeT and LNT are reported. From the luminescence data it is found that charge compensating vacancy (ccv) occupies near neighbour (28 %) and next near neighbour (72 %) sides indicating that as temperature goes down the ccv moves nearer to the impurity ion. This fact is also reflected in the optical absorption spectra of the crystal taken at these temperatures. The symmetric C-band has become asymmetric indicating that near octahedral symmetry of the impurity site has changed to lower symmetries.