Abstract
The absorption spectra and circular dichroism of gallogermanate crystals Ca<SUB>3</SUB>Ga<SUB>2</SUB>Ge<SUB>4</SUB>O<SUB>14</SUB> and Sr<SUB>3</SUB>Ga<SUB>2</SUB>Ge<SUB>4</SUB>O<SUB>14</SUB>, undoped and Cr-doped are investigated. In absorption spectra of all doped crystals three bands connected with ions Cr<SUP>3+</SUP> in octahedral coordination are found. Besides in doped crystals Sr<SUB>3</SUB>Ga<SUB>2</SUB>Ge<SUB>4</SUB>O<SUB>14</SUB> additional low-intensive bands connected apparently with Cr<SUP>4+</SUP> ions in tetrahedral coordination are presented. In circular dichroism (CD) spectra of doped crystals the absorption bands connected to Cr<SUP>3+</SUP> ions are found and the additional ones, which are not connected with Cr<SUP>3+</SUP> ions. Probably these additional bands in CD spectra in both type crystals are connected with defects generating during crystals growth. The rotary forces of transition are determined from CD spectra.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
