Synthesis, crystal structure and optical properties of Me(OH)(HCOO)2 (Me = Al, Ga)

CrystEngComm ◽  
2018 ◽  
Vol 20 (19) ◽  
pp. 2741-2748 ◽  
Author(s):  
V. N. Krasil'nikov ◽  
A. P. Tyutyunnik ◽  
I. V. Baklanova ◽  
A. N. Enyashin ◽  
I. F. Berger ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Blue Emission ◽  
Bright Light ◽  
Spectroscopy Data ◽  
Light Blue ◽  
X Ray ◽  
Monoclinic Lattice ◽  
Uv Excitation ◽  
Intrinsic Emission

Aluminium and gallium hydroxide diformates have been synthesized. Both compounds exhibit similar monoclinic lattice, according to the X-ray, neutron diffraction and IR spectroscopy data. Their samples possess a bright light-blue emission under UV excitation. The origin of intrinsic emission is elucidated by means of DFT calculations.

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

scholarly journals Люминофоры холодного голубого излучения на основе оксида алюминия, допированного диспрозием

2022 ◽  
Vol 64 (1) ◽  
pp. 95
Author(s):  
И.В. Бакланова ◽  
В.Н. Красильников ◽  
А.П. Тютюнник ◽  
Я.В. Бакланова
Keyword(s):  
Crystal Structure ◽  
Phase Composition ◽  
Diffraction Analysis ◽  
Powder Diffraction ◽  
Thermal Quenching ◽  
Emission Spectra ◽  
X Ray ◽  
White Emission ◽  
Uv Excitation ◽  
Quenching Of Luminescence

Al2О3:Dy3+ oxides with different colors luminescence were synthesized using precursor technology. The phase composition and crystal structure of the obtained materials were established by X-ray powder diffraction analysis. The excitation and emission spectra, decay curves, thermal quenching of luminescence were studied. Under UV excitation, the phosphors exhibit blue, purplish blue, white emission depending on the concentration of dysprosium and the temperature of annealing of the Al1-xDyx(OH)(HCOO)2 precursor in air.

Blue emission of ZrO2:Tm nanocrystals with different crystal structure under UV excitation

2008 ◽  
Vol 354 (14) ◽  
pp. 1559-1563 ◽  
Author(s):  
Hongwu Zhang ◽  
Xiaoyan Fu ◽  
Shuyun Niu ◽  
Qin Xin
Keyword(s):  
Crystal Structure ◽  
Blue Emission ◽  
Uv Excitation

Kristallzucht und Strukturaufklärung von K2[Pt(CN)4Cl2], K2[Pt(CN)4Br2], K2[Pt(CN)4I2] und K2[Pt(CN)4Cl2] · 2H2O/ Crystal Growth and Crystal Structure Determination of K2[Pt(CN)4Cl2], K2[Pt(CN)4Br2], K2[Pt(CN)4I2] and K2[Pt(CN)4]Cl2] · 2H2O

2004 ◽  
Vol 59 (5) ◽  
pp. 567-572 ◽  
Author(s):  
Claus Mühle ◽  
Andrey Karpov ◽  
Jürgen Nuss ◽  
Martin Jansen
Keyword(s):  
Crystal Structure ◽  
Infrared Spectroscopy ◽  
Crystal Growth ◽  
Single Crystal ◽  
Structure Determination ◽  
Spectroscopy Data ◽  
Crystal Data ◽  
X Ray ◽  
Raman And Infrared Spectroscopy

Abstract Crystals of K2Pt(CN)4Br2, K2Pt(CN)4I2 and K2Pt(CN)4Cl2 ·2H2O were grown, and their crystal structures have been determined from single crystal data. The structure of K2Pt(CN)4Cl2 has been determined and refined from X-ray powder data. All compounds crystallize monoclinicly (P21/c; Z = 2), and K2Pt(CN)4X2 with X = Cl, Br, I are isostructural. K2Pt(CN)4Cl2: a = 708.48(2); b = 903.28(3); c = 853.13(3) pm; β = 106.370(2)°; Rp = 0.064 (N(hkl) = 423). K2Pt(CN)4Br2: a = 716.0(1); b = 899.1(1); c = 867.9(1) pm; β = 106.85(1)°; R(F)N′ = 0.026 (N’(hkl) = 3757). K2Pt(CN)4I2: a = 724.8(1); b = 914.5(1); c = 892.1(1) pm; β = 107.56(1)°; R(F)N′ = 0.025 (N’(hkl) = 2197). K2Pt(CN)4Cl2 ·2H2O: a = 763.76(4); b = 1143.05(6); c = 789.06(4) pm; β = 105.18(1)°; R(F)N′ = 0.021 (N’(hkl) = 2281). Raman and infrared spectroscopy data are reported.

Two families of bis(imido) symmetrical Schiff bases: X-ray crystal structure and optical properties

2017 ◽  
Vol 1137 ◽  
pp. 681-691 ◽  
Author(s):  
Xiao-Na Ma ◽  
Xue-Jie Tan ◽  
Dian-Xiang Xing ◽  
Qi-Cheng Sui ◽  
Jian-Min Liu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Schiff Bases ◽  
X Ray

Electro-Optical Properties and X-ray Crystal Structure of a New Bisazomethine Dye

2008 ◽  
Vol 492 (1) ◽  
pp. 46/[410]-55/[419] ◽  
Author(s):  
Young-A Son ◽  
Shinya Matsumoto ◽  
Eun-Mi Han ◽  
Sheng Wang ◽  
Sung-Hoon Kim
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
X Ray

The crystal structure of horse met-myoglobin - I. General features: the arrangement of the polypeptide chains

1950 ◽  
Vol 201 (1064) ◽  
pp. 62-89 ◽  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Real Space ◽  
Monoclinic Space Group ◽  
X Ray ◽  
Vector Density ◽  
Molecular Weights ◽  
Plausible Model ◽  
Cell Dimensions ◽  
Polypeptide Chains

The preliminary results of an X-ray study of crystalline horse met-myoglobin are described. This protein crystallizes in the monoclinic space-group P2 1 with two molecules in general positions in the unit cell. The optical properties of the crystals show that the haem groups are parallel and lie approximately in the plane containing b and the internal bisector of β. a and c Patterson projections contain ridges of high vector density perpendicular to b and 15*4A apart; it is deduced that in real space the contents of the cell are arranged in pronounced layers of alternately high and low electron density, also perpendicular to b and 15*4 A apart. The b projections also exhibit rods of high vector density, 9*5 A apart and inclined at 20° to a . These rods are identified as the vector equivalents of the polypeptide chains, which thus run parallel to [20T] and 9*5 A apart. A Patterson projection along [20T] shows the rods well-resolved and in end-on view; by making certain plausible assumptions a Fourier projection has been made along the same direction. During shrinkage the cell dimensions change in such a way that the inter-chain distance alters very little; it is deduced that the molecules have flat sides parallel to (102) and that the liquid of crystallization is situated mainly on their [20T] faces. During shrinkage liquid is withdrawn and the molecules slide past one another along their flat sides. It is not possible to determine the whole shape of the molecule unequivocally; the most plausible model is a platelet built of four parallel co-planar lengths of chain each 54 A long (see figure 13). There are striking analogies between the structures of myoglobin and of horse haemoglobin. The type of chain folding seems to be the same in the two proteins, and probably the same as in a-keratin; and it may be that myoglobin has a structure analogous to that of one of the four layers of which haemoglobin is believed to be built up, the molecular weights of the two proteins being in the ratio 1:4.

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.

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