The Mixed Lanthanum Dichalcogenide beta-LaS1.86(1)Se0.14(1). Synthesis, Crystal Structure, Raman Spectrum and Optical Band Gap

2011 ◽  
Vol 66 ◽  
pp. 0873 ◽  
Author(s):  
C. Bartsch ◽  
T. Doert
Keyword(s):  
Crystal Structure ◽  
Raman Spectrum ◽  
Band Gap ◽  
Optical Band Gap

The Mixed Lanthanum Dichalcogenide β-LaS1.86(1)Se0.14(1). Synthesis, Crystal Structure, Raman Spectrum and Optical Band Gap

2011 ◽  
Vol 66 (9) ◽  
pp. 873-876
Author(s):  
Christian Bartsch ◽  
Thomas Doert
Keyword(s):  
Crystal Structure ◽  
Raman Spectrum ◽  
Band Gap ◽  
Optical Spectroscopy ◽  
Optical Band Gap ◽  
Structure Type ◽  
Lattice Parameters ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Lanthanum Sulfide

The ternary lanthanum sulfide selenide β -LaS1.86(1)Se0.14(1) was obtained by reaction of the elements in an NaCl flux. The new compound adopts the β -LnS2 structure type and crystallizes in the orthorhombic space group Pnma (no. 62) with lattice parameters of a = 814.77(1), b = 1638.46(1) and c = 413.88(1) pm. Raman lines indicate the presence of mixed (S1−ySey)2− dianions with y ≈ 0.14, besides the well known S22− dianions. The band gap of β -LaS1.86(1)Se0.14(1) is 2.5 eV as determined by optical spectroscopy.

Effect of Nb doping on morphology, crystal structure, optical band gap energy of TiO2 thin films

2014 ◽  
Vol 14 (3) ◽  
pp. 421-427 ◽  
Author(s):  
Deuk Yong Lee ◽  
Ju-Hyun Park ◽  
Young-Hun Kim ◽  
Myung-Hyun Lee ◽  
Nam-Ihn Cho
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Band Gap ◽  
Optical Band Gap ◽  
Band Gap Energy ◽  
Tio2 Thin Films ◽  
Gap Energy ◽  
Nb Doping

Effect of 2,4-dinitrophenol dye doping on tristhioureazinc(II) sulfate single crystals: a potential nonlinear optical material

2020 ◽  
Vol 53 (4) ◽  
pp. 972-981 ◽  
Author(s):  
G. Durgababu ◽  
G. J. Nagaraju ◽  
G. Bhagavannarayana
Keyword(s):  
Crystal Structure ◽  
Band Gap ◽  
Single Crystals ◽  
Nonlinear Optical ◽  
Optical Band Gap ◽  
Band Gap Energy ◽  
Optical Range ◽  
Gap Energy ◽  
Uv Visible ◽  
Crystalline Matrix

Good quality single crystals of 2,4-dinitrophenol (DNP)-doped tristhioureazinc(II) sulfate (ZTS) were successfully grown by employing the simple and cost effective slow-evaporation solution technique. To study the effect of doping on various device properties, the grown single crystals were subjected to powder X-ray diffraction (PXRD), high-resolution XRD, thermogravimetric analysis (TGA), Vickers hardness testing, and UV–visible, photoluminescence (PL) and Fourier transform IR (FTIR) spectroscopy techniques. The crystal structure of DNP-doped ZTS bulk single crystals remained the same as the crystal structure of ZTS. However, the changes in intensities of the diffraction peaks in the PXRD spectra indicated the incorporation of dopants into the crystalline matrix. FTIR studies confirm the incorporation of dopants into the crystalline matrix, shown by the shifting of certain prominent absorption bands towards higher energy. This also indicated the induced useful strain due to doping, leading to charge transfer and the enhancement of nonlinear optical properties. The cut-off wavelength and optical band gap energy of pure ZTS and DNP-doped ZTS crystals were studied by UV–visible absorption spectroscopy, revealing a slight reduction in the optical band gap energy due to doping, which in turn revealed the enhancement of the optical range. PL studies revealed an enhanced optical range of photoluminescence in ZTS crystals. Second harmonic generation (SGH) studies carried out by the Kurtz powder technique revealed the enhancement of SHG value due to DNP doping. To ensure the thermal stability and mechanical strength of the grown crystals with doping (required from the point of view of device applications), TGA and Vicker's hardness studies were performed.

scholarly journals Effect of Deposition Pressure on the Microstructure and Optical Band Gap of Molybdenum Disulfide Films Prepared by Magnetron Sputtering

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 570 ◽  
Author(s):  
Gong ◽  
Xiao ◽  
Zhu ◽  
Wang ◽  
Ma
Keyword(s):  
Crystal Structure ◽  
Grain Size ◽  
Surface Morphology ◽  
Magnetron Sputtering ◽  
Band Gap ◽  
Optical Band Gap ◽  
Exciton Energy ◽  
Deposition Pressure ◽  
Electronegativity Difference ◽  
Structure Surface

MoS2 films were prepared via magnetron sputtering under different deposition pressures, and the effects of deposition pressure on the crystal structure, surface morphology, and optical properties of the resulting films were investigated. The results show that the crystallinity of the films first increases and then decreases with increasing pressure. The surface of the films prepared by magnetron sputtering is dense and uniform with few defects. The deposition pressure affects the grain size, surface morphology, and optical band gap of the films. The films deposited at a deposition pressure of 1 Pa revealed remarkable crystallinity, a 30.35 nm grain size, and a 1.67 eV optical band gap. Given the large electronegativity difference between MoS2 molecules and weak van der Waals forces between layers, the MoS2 films are prone to defects at different deposition pressures, causing the exciton energy near defects to decrease and the modulation of the surrounding band.

Crystal structure, electronic properties and optical band gap of KLa(1−x)Eux(PO3)4

2014 ◽  
Vol 609 ◽  
pp. 222-227 ◽  
Author(s):  
M. Ferhi ◽  
K. Horchani-Naifer ◽  
C. Bouzidi ◽  
H. Elhouichet ◽  
M. Ferid
Keyword(s):  
Crystal Structure ◽  
Band Gap ◽  
Electronic Properties ◽  
Optical Band Gap

Crystal structure, conformation, vibration and optical band gap analysis of bis[rac-propranolol nitrate]

2009 ◽  
Vol 927 (1-3) ◽  
pp. 121-125 ◽  
Author(s):  
S. Franklin ◽  
T. Balasubramanian ◽  
K. Nehru ◽  
Youngmee Kim
Keyword(s):  
Crystal Structure ◽  
Band Gap ◽  
Optical Band Gap ◽  
Gap Analysis

scholarly journals Crystal structure of (C9H17N2)3[Bi2I9]

2021 ◽  
Vol 77 (9) ◽  
Author(s):  
Zoe James ◽  
Yunhe Cai ◽  
Paz Vaqueiro
Keyword(s):  
Crystal Structure ◽  
Band Gap ◽  
Single Crystals ◽  
Title Compound ◽  
Optical Band Gap ◽  
Solvothermal Method ◽  
Monoclinic Space Group ◽  
Asymmetric Unit ◽  
Space Group

Single crystals of tris(2,3,4,6,7,8,9,10-octahydropyrimido[1,2-a]azepin-1-ium) tri-μ2-iodido-bis[triiodidobismuth(III)], (C9H17N2)3[Bi2I9], were prepared by a solvothermal method, heating a mixture of BiI3, KI, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and ethanol at 443 K for six days. The asymmetric unit of the title compound, which crystallizes in the monoclinic space group P21/c, contains one [Bi2I9]3− anion and three protonated DBUH+ moieties. The dinuclear [Bi2I9]3− anions, which are composed of face-sharing BiI6 3− octahedra, are packed in columns parallel to the [010] direction, and separated by protonated DBUH+ moieties. The optical band gap of (C9H7N2)3Bi2I9 is 2.1 eV.

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