Interrelation of vibrational spectra of Ag3Ga5Se9, Ag3Ga5Te9 and Ag3In5Te9 single crystals: A consequence of trivalent cation and anion substitutions

Silver gallium (indium) ternary selenides (tellurides) single crystals were studied through infrared reflection in the frequency range of 80-500 cm(-1). These spectra presented four infrared-active modes for studied crystals. Spectral dependencies of optical constants were computed from reflectivity spectra. The frequencies of transverse and longitudinal optical modes, damping constants and oscillator strengths were also evaluated. By replacing light selenium anions by heavier tellurium ones in Ag3Ga5Se9 crystal and by substitution of light gallium cations by heavier indium ones in Ag3Ga5Te9 crystal all the bands shift towards low frequencies. The bands observed in IR spectra of studied crystals were assigned to various vibration types (valence and valence-deformation). Crystal structure and atomic composition ratio of the constituent elements in Ag3Ga5Se9, Ag3Ga5Te9 and Ag3In5Te9 crystals were revealed by structural characterization techniques of X-ray diffraction and energy dispersive spectroscopy.


Far-infrared lattice vibration spectra of copper gallium (indium) ternary selenides (tellurides): A consequence of trivalent cation and anion interrelation
Hasanlı, Nızamı (2017-01-01)
Experimental spectra for copper gallium (indium) ternary selenides (tellurides) crystals, measured in the 50-500 cm(-1) frequency range, revealed four infrared-active modes. Spec tral dependencies of refractive index and absorption coefficient were computed from reflectivity experiments. The frequencies of optical modes, damping constants and oscillator strengths were also evaluated. The bands observed in IR spectra were provisionally attributed to various vibration types (valence and valence-deformation). ...
Interband critical points in TlGaxIn1-xS2 layered mixed crystals (0 <= x <= 1)
IŞIK, MEHMET; Hasanlı, Nızamı (2013-12-25)
The layered semiconducting TlGaxIn1-xS2 mixed crystals (0 <= x <= 1) were studied by spectroscopic ellipsometry measurements in the 1.2-6.2 eV spectral range at room temperature. The spectral dependence of the components of the complex dielectric function, refractive index and extinction coefficient were revealed using an optical model. The interband transition energies in the studied samples were found from the analysis of the second-energy derivative spectra of the complex dielectric function. The variati...
A general and efficient synthesis of nitrogen-substituted ferrocenes
Özçubukçu, Salih; Leifert, Annika; Bolm, Carsten (Georg Thieme Verlag KG, 2007-02-01)
Copper(l) iodide mediated Ullmann-type coupling reactions of iodoferrocene and 1,1'-diiodoferrocene has been used to synthesize N-substituted ferrocenes that are difficult to obtain by classical methods. In this manner, a range of Fc-[N]-R-type compounds have been prepared in moderate to good yields.
Optical characterization of CuIn5S8 crystals by ellipsometry measurements
IŞIK, MEHMET; Gasanly, Nizami (2016-04-01)
Optical properties of CuIn5S8 crystals grown by Bridgman method were investigated by ellipsometry measurements. Spectral dependence of optical parameters; real and imaginary parts of the pseudodielectric function, pseudorefractive index, pseudoextinction coefficient, reflectivity and absorption coefficients were obtained from the analysis of ellipsometry experiments performed in the 1.2-6.2 eV spectral region. Analysis of spectral dependence of the absorption coefficient revealed the existence of direct ban...
Investigating the biochar effects on C-mineralization and sequestration of carbon in soil compared with conventional amendments using the stable isotope (delta C-13) approach
Yousaf, Balal; Liu, Guijian; Wang, Ruwei; Abbas, Qumber; Imtiaz, Muhammad; Liu, Ruijia (2017-06-01)
Biomass-derived black carbon (biochar) is considered to be an effective tool to mitigate global warming by long-term C-sequestration in soil and to influence C-mineralization via priming effects. However, the underlying mechanism of biochar (BC) priming relative to conventional biowaste (BW) amendments remains uncertain. Here, we used a stable carbon isotope (delta C-13) approach to estimate the possible biochar effects on native soil C-mineralization compared with various BW additions and potential carbon ...
Citation Formats
N. Hasanlı, “Interrelation of vibrational spectra of Ag3Ga5Se9, Ag3Ga5Te9 and Ag3In5Te9 single crystals: A consequence of trivalent cation and anion substitutions,” MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING, pp. 213–216, 2017, Accessed: 00, 2020. [Online]. Available: