scholarly journals Structure and Optical Properties of B'- Phase of Ag8SnSe6

2016 ◽  
Vol 17 (3) ◽  
pp. 346-349
Author(s):  
І.V. Semkiv
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Absorption Spectrum ◽  
Optical Absorption ◽  
Experimental Studies ◽  
Energy Dispersive Spectrum ◽  
Energy Dispersive ◽  
Interatomic Distances ◽  
X Ray ◽  
Good Agreement

Energy dispersive x-ray spectroscopy of lowtemperature b¢-Ag8SnSe6 crystalcarried out. Energy dispersive spectrum shows only peaks related to Ag8SnSe6. Experimental optical absorption spectrum and band gap value 0.82 eV are determined. Theoretical calculation of absorption spectrum shows good agreement with experimental studies. Modeling of crystal structure of Ag8SnSe6 argyrodite and interatomic distances calculation are carried out.

Synthesis and Fluorescence Properties of Water-Soluble L-Cysteine-Modified ZnSe:Ag Quantum Dots

2014 ◽  
Vol 1033-1034 ◽  
pp. 1172-1175
Author(s):  
Li Ping Lin ◽  
Feng Hua Huang ◽  
Pei Feng Chen
Keyword(s):  
Crystal Structure ◽  
Quantum Dots ◽  
Optical Properties ◽  
Absorption Spectrum ◽  
Photoluminescence Spectrum ◽  
Water Soluble ◽  
Precipitation Method ◽  
X Ray ◽  
Surface Modifier ◽  
Co Precipitation

The water-soluble ZnSe:Ag quantum dots were synthesized in aqueous medium by chemical co-precipitation method with L-cysteine as surface modifier. The crystal structure and optical properties of the obtained ZnSe:Ag quantum dots have been characterized by X-ray power diffraction, infrared spectrum, UV-Vis absorption spectrum and photoluminescence spectrum. Results indicate that ZnSe:Ag quantum dots belong to the cubic blende structure and have good fluorescent characteristics. The L-cysteine modified on the surface of ZnSe:Ag quantum dots renders the quantum dots water-soluble, biocompatible.

scholarly journals Study on the Electrical, Structural, Chemical and Optical Properties of PVD Ta(N) Films Deposited with Different N2 Flow Rates

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 937
Author(s):  
Yingying Hu ◽  
Md Rasadujjaman ◽  
Yanrong Wang ◽  
Jing Zhang ◽  
Jiang Yan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Photoelectron Spectroscopy ◽  
Crystal Size ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Dc Magnetron Sputtering ◽  
Flow Rates ◽  
X Ray ◽  
N2 Flow Rate

By reactive DC magnetron sputtering from a pure Ta target onto silicon substrates, Ta(N) films were prepared with different N2 flow rates of 0, 12, 17, 25, 38, and 58 sccm. The effects of N2 flow rate on the electrical properties, crystal structure, elemental composition, and optical properties of Ta(N) were studied. These properties were characterized by the four-probe method, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and spectroscopic ellipsometry (SE). Results show that the deposition rate decreases with an increase of N2 flows. Furthermore, as resistivity increases, the crystal size decreases, the crystal structure transitions from β-Ta to TaN(111), and finally becomes the N-rich phase Ta3N5(130, 040). Studying the optical properties, it is found that there are differences in the refractive index (n) and extinction coefficient (k) of Ta(N) with different thicknesses and different N2 flow rates, depending on the crystal size and crystal phase structure.

The solely motif-doped Au36−xAgx(SPh-tBu)24(x = 1–8) nanoclusters: X-ray crystal structure and optical properties

Nanoscale ◽  
2016 ◽  
Vol 8 (33) ◽  
pp. 15317-15322 ◽  
Author(s):  
Jiqiang Fan ◽  
Yongbo Song ◽  
Jinsong Chai ◽  
Sha Yang ◽  
Tao Chen ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
X Ray

Crystal architecture of R 2SnS5 (R = Pr, Nd, Gd and Tb): crystal structure relationships in chalcogenides

2008 ◽  
Vol 64 (2) ◽  
pp. 172-176 ◽  
Author(s):  
Marek Daszkiewicz ◽  
Lubomir D. Gulay ◽  
Vasylyna Ya. Shemet
Keyword(s):  
Crystal Structure ◽  
Comparative Analysis ◽  
Single Crystal ◽  
Copper Ions ◽  
Stoichiometric Compound ◽  
Single Crystal Diffraction ◽  
Interatomic Distances ◽  
X Ray ◽  
Structural Relationships ◽  
Complex Architecture

The crystal structure of the R 2SnS5 (R = Pr, Nd, Gd and Tb) compounds has been investigated using X-ray single-crystal diffraction. Crystal architecture and structural relationships among U3S5, Y2HfS5, R 2SnS5 compounds are discussed and a structural origin is determined. It is shown that the complex architecture of the crystal structure of Eu5Sn3S12 is a result of interweaving of the simple crystal structures. The location of the copper ions in the non-stoichiometric compound Y2Cu0.20Sn0.95S5 is proposed on the basis of comparative analysis of the R—S interatomic distances in the R 2SnS5 series of compounds.

OPTICAL SPECTROSCOPY AND NONLINEAR TRANSMITTANCE STUDY OF FULLERENE C60 IN MIXTURES WITH 2-CYCLOOCTYLAMINO-5-NITROPYRIDINE (COANP)

2004 ◽  
Vol 13 (01) ◽  
pp. 113-127 ◽  
Author(s):  
SERGEY S. SARKISOV ◽  
ELENA I. RADOVANOVA ◽  
BURL H. PETERSON ◽  
ALEX LEYDERMAN ◽  
MICHAEL CURLEY ◽  
...  
Keyword(s):  
Optical Properties ◽  
Absorption Spectrum ◽  
Optical Absorption ◽  
Infrared Absorption ◽  
Chemical Bonding ◽  
Infrared Absorption Spectrum ◽  
Visible Region ◽  
Fullerene C60 ◽  
Amino Group

Characterization of the infrared absorption spectrum of the solutions of fullerene C 60 with 2-cyclooctylamino-5-nitropyridine additive has been performed with the focus on possible bonding with the amino-group of the additive. No occurrence of such bonding was found at normal conditions. Also no change of optical absorption in visible region and optical limiting of fullerene due to chemical bonding with the additive was detected. The resulting optical properties of the mixture were simply a sum of the properties of the components for a molar proportion of the additive to fullerene approaching 200:1.

The Crystal Structure of ThPd4

1962 ◽  
Vol 6 ◽  
pp. 91-95
Author(s):  
J. R. Thomson
Keyword(s):  
Crystal Structure ◽  
Interatomic Distances ◽  
X Ray ◽  
Simple Cubic

AbstractThe structure of ThPd4 has been determined by X-ray powder methods. It has the simple cubic Cu3Au (LI2) structure a = 4.110 ± 0.002 Å at 80 at. % palladium. Interatomic distances and the range of stability of this compound and of ThPd3 are discussed briefly.

Darstellung, Schwingungsspektren und Normalkoordinatenanalyse der 10B-und 11B-Isotopomeren von [B2(NCS)6]2- sowie Kristallstruktur von (Ph3P=N=PPh3)2[B2(NCS)6] / Preparation, Vibrational Spectra and Normal Coordinate Analysis of the 10B and 11B Isotopomers of [B2(NCS)6]2- and Crystal Structure of (Ph3P=N=PPh3)2[B2(NCS)6]

1996 ◽  
Vol 51 (4) ◽  
pp. 551-556 ◽  
Author(s):  
W. Preetz ◽  
B. Steuer
Keyword(s):  
Crystal Structure ◽  
Normal Coordinate Analysis ◽  
Force Constants ◽  
Potential Energy Distribution ◽  
X Ray Diffraction ◽  
Normal Coordinate ◽  
Triclinic Space Group ◽  
X Ray ◽  
Fractionated Crystallization ◽  
Good Agreement

Abstract By reaction of [B6H6]2- with a solution of (SCN)2 in dichloromethane in the presence of solid KOH the hexaisothiocyanatodiborate anion [B2(NCS)6]2- is formed and can be isolated by fractionated crystallization. The crystal structure of (PNP)2[B2(NCS)6] has been determined by single crystal X-ray diffraction analysis; triclinic space group P1̄ with a=12,282(5), b=12,416(5), c=14,155(5)Å, a=68,36(5), β=70,59(5), γ=80,93(5)°.The [B2(NCS)6]2- anion reveals a staggered conformation with nearly local D3d symmetry and a B-B bond length of 1,73(2) Å. Using the crystallographic data a normal coordinate analysis has been performed. With a set of 12 force constants (e.g. fd(BB)=3,62, fd(BN)=4,21 mdyn/Å) a good agreement between observed and calculated frequencies for the 10B and 11B isotopomers has been achieved. The potential energy distribution on the force constants reveals strong vibrational couplings within the B2N6 framework.

scholarly journals X-ray Single-Crystal Structural Analysis of a Magnetically Oriented Monoclinic Microcrystal Suspension of α-Glycine

Crystals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 561 ◽  
Author(s):  
Tatsuya Tanaka ◽  
Chiaki Tsuboi ◽  
Kazuaki Aburaya ◽  
Fumiko Kimura ◽  
Masataka Maeyama ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Susceptibility ◽  
Single Crystal ◽  
Magnetic Energy ◽  
Powder Sample ◽  
Single Crystal Structure ◽  
X Ray ◽  
Crystal Structural ◽  
The Relationship ◽  
Good Agreement

We previously reported on a method for X-ray single-crystal structure determination from a powder sample via a magnetically oriented microcrystal suspension (MOMS). The method was successfully applied to orthorhombic microcrystals (L-alanine, P212121). In this study, we apply this method to monoclinic microcrystals. Unlike most of the orthorhombic MOMSs, monoclinic MOMSs exhibit two or four orientations with the same magnetic energy (we refer to this as twin orientations), making data processing difficult. In this paper, we perform a MOMS experiment for a powder sample of monoclinic microcrystal (α-glycine, P21/n) to show that our method can also be applied to monoclinic crystals. The single-crystal structure determined in this work is in good agreement with the reported one performed on a real single crystal. Furthermore, the relationship between the crystallographic and magnetic susceptibility axes is determined.

Preparation and Properties of CuInS2 Thin-Film by Successive Ionic Layer Adsorption and Reaction (SILAR) Method

2007 ◽  
Vol 280-283 ◽  
pp. 877-880
Author(s):  
Zheng Guo Jin ◽  
Yong Shi ◽  
Ji Jun Qiu ◽  
Xiao Xin Liu
Keyword(s):  
Thin Films ◽  
Absorption Spectrum ◽  
Optical Absorption ◽  
Optical Absorption Spectrum ◽  
Photoelectron Spectra ◽  
Molar Ratio ◽  
Silar Method ◽  
X Ray ◽  
Cuins2 Thin Films ◽  
Ionic Layer

CuInS2 thin films were deposited on galss substrate by successive ionic layer absorption and reaction (SILAR) method at room temperature. CuCl2, InCl3, and Na2S were used as precursor materials. The thin films were obtained during the dipping of 20-40 cycles and after annealing in the N2 atmosphere at 500°C. The characterization of the film was carried out by X-ray diffraction, scanning electron microscopy, optical absorption spectrum and X-ray photoelectron spectra. Quantification of the XPS peaks shows that the molar ratio of Cu:In:S of the film is close to the stoichiometry of CuInS2. XRD result demonstrated that the formed compound is CuInS2 with chalcopyrites crystal structure. Direct band gap was found to be 1.5eV from optical absorption spectrum.

Sign in / Sign up

Export Citation Format

Share Document