Optical Properties of Cation-Substituted (Cu1-xAgx)7GeSe5I Mixed Crystals
Creators
- 1. Uzhhorod National University, Faculty of Physics, 46, Pidhirna Str., Uzhhorod (Ukraine)
- 2. Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynska dolina, 84248 Bratislava (Slovakia)
Description
(Cu1-xAgx)7GeSe5I mixed crystals were grown by the vertical zone crystallization method and are shown to crystallize in a cubic structure (F43m). The diff use reflection spectra for the powders of (Cu1-xAgx)7GeSe5I mixed crystals were measured at room temperature. The refractive indices and extinction coefficients for (Cu1-xAgx)7GeSe5I mixed crystals were obtained from spectral ellipsometry measurements. Two anomalies of the refractive index in the spectral region from 440 nm to 1000 nm are observed. One of them corresponds to the band-to-band optical transition, while another one to the interband Van Hove–Phillips singularity. A nonlinear decrease of the energy pseudogap is revealed with an increase in the Ag content in (Cu1-xAgx)7GeSe5I mixed crystals. (author)
Additional details
Publishing Information
- Journal Title
- Ukrayins'kij Fyizichnij Zhurnal (Kyiv)
- Journal Volume
- 66
- Journal Issue
- no.5
- Journal Page Range
- p. 406-411
- ISSN
- 0372-400X
INIS
- Country of Publication
- Ukraine
- Country of Input or Organization
- Ukraine
- INIS RN
- 52058951
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- BRIDGMAN METHOD; COPPER COMPOUNDS; CRYSTAL GROWTH; CRYSTALLIZATION; CUBIC LATTICES; ELLIPSOMETRY; GERMANIUM COMPOUNDS; IODIDES; REFLECTION; REFRACTIVE INDEX; SELENIDES; SILVER COMPOUNDS
- Descriptors DEC
- CHALCOGENIDES; CRYSTAL GROWTH METHODS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; HALIDES; HALOGEN COMPOUNDS; IODINE COMPOUNDS; MEASURING METHODS; OPTICAL PROPERTIES; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; SELENIUM COMPOUNDS; THREE-DIMENSIONAL LATTICES; TRANSITION ELEMENT COMPOUNDS