Semicoherent growth of single-crystal β-In2S3 layers on InP(111) and InAs(111)

CrystEngComm ◽  
2019 ◽  
Vol 21 (38) ◽  
pp. 5818-5823
Author(s):  
Yukihiko Takagaki ◽  
Bernd Jenichen ◽  
Oliver Brandt
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Tetragonal Crystal ◽  
Tetragonal Crystal Structure ◽  
Small Lattice

The (103) surface of β-In2S3 consists of a purely accidental hexagonal-like periodicity despite the tetragonal crystal structure of β-In2S3. β-In2S3 layers grow, as a consequence, semicoherently on the (111) surfaces of InP and InAs due to small lattice mismatches.

scholarly journals High temperature tetragonal crystal structure of UPt2Si2

2020 ◽  
Vol 235 (6-7) ◽  
pp. 175-181
Author(s):  
Karel Prokeš ◽  
Oscar Fabelo ◽  
Stefan Süllow ◽  
Jooseop Lee ◽  
John A. Mydosh
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Space Group ◽  
Tetragonal Crystal ◽  
Tetragonal Crystal Structure

AbstractHigh temperature crystal structure of UPt2Si2 determined using single-crystal neutron diffraction at 400 K is reported. It is found that the crystal structure remains of the primitive tetragonal CaBe2Ge2 type with the space group P4/nmm. Anisotropic displacement factors of the Pt atoms at the 2a (3/4 1/4 0) and Si atoms at the 2c (1/4 1/4 z) Wyckoff sites are found to be anomalously large.

Neutron Powder Diffraction on Ce11B2C2and Nd11B2C2: A New Model for the Tetragonal Crystal Structure

1999 ◽  
Vol 68 (7) ◽  
pp. 2287-2291 ◽  
Author(s):  
Takahiro Onimaru ◽  
Hideya Onodera ◽  
Kenji Ohoyama ◽  
Hiroki Yamauchi ◽  
Yasuo Yamaguchi
Keyword(s):  
Crystal Structure ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction ◽  
New Model ◽  
Tetragonal Crystal ◽  
Tetragonal Crystal Structure

Studied on Structural Characterization of Lanthanum Doped Barium Titanium Ceramics

2015 ◽  
Vol 819 ◽  
pp. 198-203
Author(s):  
Nur Farahin Abdul Hamid ◽  
Rozana Aina Maulat Osman ◽  
Mohd Sobri Idris ◽  
Tze Qing Tan
Keyword(s):  
Crystal Structure ◽  
Lattice Parameter ◽  
Phase Changes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tetragonal Crystal ◽  
Tetragonal Crystal Structure ◽  
La Doped ◽  
Conventional Solid State Synthesis

La-doped barium titanate (BaTiO3) was prepared using conventional solid state synthesis route. All peaks for sample x=0 are approaching the phase pure of BaTiO3 structure with tetragonal crystal structure (P4mm). Sintering of pressed powder are performed at 1300oC, 1400oC and 1450oC for overnight for pure BaTiO3 and 1350oC for 3 days for BaTiO3 doped lanthanum with intermittent grinding. Phase transition was studied by different x composition. The changes in the crystal structure of the composition x=0.1 and 0.2 were detected by using X-ray diffraction (XRD). The phase changes between tetragonal-cubic and cubic-tetragonal depending on the temperature. Rietveld Refinement analysis is carried out to determine the lattice parameter and unit cell for BaTiO3.

Heat Treatment Effect on the Structural and Optical Properties of CdGa2S4 Thin Films

2003 ◽  
Vol 17 (13n14) ◽  
pp. 771-782 ◽  
Author(s):  
M. M. El-Nahass ◽  
H. S. Soliman ◽  
E. A. A. El-Shazly
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Refractive Index ◽  
High Frequency ◽  
Optical Constants ◽  
Thermal Evaporation ◽  
Structural And Optical Properties ◽  
High Frequency Dielectric Constant ◽  
Tetragonal Crystal ◽  
Tetragonal Crystal Structure

CdGa 2 S 4 was prepared in powder form by reacting CdS and Ga 2 S 3. The powder had a tetragonal crystal structure with lattice parameters, a = 0.559 ± 0.005 nm , c = 1.008 ± 0.009 nm and c/a = 1.803. CdGa 2 S 4 films deposited by thermal evaporation of the powder were noncrystalline. After annealing, the CdGa 2 S 4 thin films contain crystals with the tetragonal crystal structure. The optical constants (the refractive index n, the absorption index k and the absorption coefficient α) were determined for CdGa 2 S 4 thin films in the thickness range 170–452 nm. It was found that both n and k are independent of the film thickness and both are slightly different as deposited and annealed films. The refractive index shows anomalous dispersion in the spectral range 300–700 nm. The high frequency dielectric constant ε∞ was determined for the as-deposited and after being annealed films. It was found that ε∞ = 5.12 and 5.52 for the as-deposited and after being annealed films respectively. Graphical representations of (αhν)r = f(hν) yield three linear parts, indicating the existence of two indirect and one direct allowed transitions. The values of [Formula: see text], [Formula: see text] and [Formula: see text] for CdGa 2 S 4 for the as-deposited and annealed films are presented.

Aging behaviour of U-6.0Wt.% Nb at temperatures above 350°C

1990 ◽  
Vol 48 (4) ◽  
pp. 992-993
Author(s):  
G. Beverini ◽  
D.V. Edmonds
Keyword(s):  
Crystal Structure ◽  
Partial Pressure ◽  
Temperature Regime ◽  
Age Hardening ◽  
Fine Scale ◽  
Tetragonal Crystal ◽  
Tetragonal Crystal Structure ◽  
Compositional Changes ◽  
Thick Disks

Large strength increments accompanied by severe ductility losses are observed upon ageing U-6Nb at temperatures between 350°C and 450°C. This study attempts to characterize the fine scale morphological and compositional changes observed upon ageing this alloy in this temperature regime. Precipitation of Nb-rich particles having a tetragonal crystal structure is believed to be the mechanism responsible for age hardening in this alloy.Material supplied by AWE, Aldermaston, U.K. was received in the as-water quenched (WQ) condition in the form of 3 mm. diameter rods. Material was aged in sealed silica tubes containing a partial pressure of argon. The aged rods were then sliced to 0.5 mm. thick disks and subsequently ground down to a thickness of 90 μm. using 1200 grit SiC paper. Electropolishing was carried out in a Fischione twin-jet electropolishing unit using a solution of 5% HClO in methanol cooled to -60°C at a voltage of 40V.

Self-Assembled GdSi2 Nanostructures Grown on Si(001) Studied by TEM and STM

2005 ◽  
Vol 901 ◽  
Author(s):  
Gangfeng Ye ◽  
Martin A. Crimp ◽  
Jun Nogami
Keyword(s):  
Crystal Structure ◽  
Scanning Tunneling ◽  
Hexagonal Crystal ◽  
Tunneling Microscopy ◽  
Cross Sectional ◽  
Plan View ◽  
Transmission Electron ◽  
Tetragonal Crystal ◽  
Tetragonal Crystal Structure ◽  
Self Assembled

AbstractSelf-assembled gadolinium silicide (GdSi2) nanostructures grown on Si(001) were studied by transmission electron microscopy (TEM) and scanning tunneling microscopy (STM). Cross-sectional TEM and plan-view TEM moiré fringe pattern analyses show that the GdSi2 nanostructures can be divided into two classes: elongated nanowires with hexagonal crystal structure and rectangular islands with orthorhombic or tetragonal crystal structure.

scholarly journals Facile Synthesis of N-Doped BiOCl Photocatalyst by an Ethylenediamine-Assisted Hydrothermal Method

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Guihua Chen ◽  
Gangling Chen ◽  
Yong Wang ◽  
Qingfeng Wang ◽  
Zhen Zhang
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Rhodamine B ◽  
Facile Synthesis ◽  
Nitrogen Doped ◽  
Tetragonal Crystal ◽  
Tetragonal Crystal Structure ◽  
The Stability

A nitrogen doped BiOCl (N-BiOCl) photocatalyst was synthesized and characterized using an ethylenediamine-assisted hydrothermal method. The N-BiOCl sample demonstrated the same tetragonal crystal structure as the as-prepared pure BiOCl sample. SEM results indicated that N-BiOCl sample was self-assembled by nanoplates to provide an aggregated flower-like microstructure. Doped nitrogen was substituted for oxygen in the crystal lattice of BiOCl, causing a red shift for N-BiOCl sample compared to BiOCl sample. The N-BiOCl sample exhibited higher photocatalytic activity in the degradation of Rhodamine B under visible light than observed in BiOCl sample, and the stability of the sample was verified. Meanwhile, speculative causes for the enhancement in the photocatalytic activity of N-BiOCl sample were also proposed.

The Tetragonal Crystal Structure of 2:3 Deoxycholic Acid-Water Complex

1979 ◽  
Vol 18 (3-4) ◽  
pp. 385-389 ◽  
Author(s):  
C. P. Tang ◽  
R. Popovitz-Biro ◽  
M. Lahav ◽  
L. Leiserowitz
Keyword(s):  
Crystal Structure ◽  
Deoxycholic Acid ◽  
Acid Water ◽  
Water Complex ◽  
Tetragonal Crystal ◽  
Tetragonal Crystal Structure

Two-Dimensional Buckled Tetragonal cadmium chalcogenides, including CdS, CdSe, and CdTe Monolayers as Photo-catalysts for Water Splitting

2021 ◽  
Author(s):  
Mosayeb Naseri ◽  
Asadollah Bafekry ◽  
M. Faraji ◽  
Hoat Do Minh ◽  
Mohamed Fadlallah ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Production ◽  
Water Splitting ◽  
Sustainable Energy ◽  
Pure Hydrogen ◽  
Two Dimensional ◽  
Tetragonal Crystal ◽  
Tetragonal Crystal Structure ◽  
Cadmium Chalcogenides

Pure hydrogen production via water splitting is an ideal strategy for producing clean and sustainable energy. The two-dimensional (2D) cadmium chalcogenides single-layers with a tetragonal crystal structure, namely Tetra-CdX (X=S,...

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