Correction to “geometrical interpretation of X-ray peak displacements due to stacking faults in powder patterns of close-packed structure”

1970 ◽  
Vol 4 (8) ◽  
pp. 589-592 ◽  
Author(s):  
S. Lele ◽  
P. Rama Rao
Keyword(s):  
Stacking Faults ◽  
Geometrical Interpretation ◽  
X Ray ◽  
Close Packed Structure ◽  
Packed Structure

scholarly journals Solidified Fillings of Nanopores

2005 ◽  
Vol 876 ◽  
Author(s):  
Patrick Huber ◽  
Klaus Knorr
Keyword(s):  
Pore Diameter ◽  
Stacking Faults ◽  
Pore Geometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Medium Length ◽  
Close Packed Structure ◽  
Packed Structure ◽  
Diffraction Patterns ◽  
Selection Of

AbstractWe present a selection of x-ray diffraction patterns of spherical (He, Ar), dumbbell- (N2, CO), and chain-like molecules (n-C9H20, n-C19H40) solidified in nanopores of silica glass (mean pore diameter 7nm). These patterns allow us to demonstrate how key principles governing crystallization have to be adapted in order to accomplish solidification in restricted geometries. 4He, Ar, and the spherical close packed phases of CO and N2 adjust to the pore geometry by introducing a sizeable amount of stacking faults. For the pore solidified, medium-length chainlike n-C19H40 we observe a close packed structure without lamellar ordering, whereas for the short-chain C9H20 the layering principle survives, albeit in a modified fashion compared to the bulk phase.

scholarly journals Double hexagonal close-packed structure revealed in a single colloidal crystal grain by Bragg rod analysis

2014 ◽  
Vol 47 (4) ◽  
pp. 1199-1204 ◽  
Author(s):  
J.-M. Meijer ◽  
A. Shabalin ◽  
R. Dronyak ◽  
O. M. Yefanov ◽  
A. Singer ◽  
...  
Keyword(s):  
Generation X ◽  
Colloidal Crystal ◽  
Structural Information ◽  
Stacking Sequence ◽  
Experimental Conditions ◽  
X Ray ◽  
Hexagonal Close Packed ◽  
Close Packed Structure ◽  
Hexagonal Close Packed Structure ◽  
Packed Structure

A coherent X-ray diffraction study of a single colloidal crystal grain composed of silica spheres is reported. The diffraction data contain Bragg peaks and additional features in the form of Bragg rods, which are related to the stacking of the hexagonally close-packed layers. The profile of the Bragg rod shows distinct intensity modulations which, under the specific experimental conditions used here, are directly related to the stacking sequence of the layers. Using a model for the scattered intensity along the Bragg rod for an exact stacking sequence of a finite number of hexagonally close-packed layers, it is found that a double hexagonal close-packed stacking sequence is present in the colloidal crystal grain. This analysis method opens up ways to obtain crucial structural information from finite-sized crystalline samples by employing advanced third-generation X-ray sources.

Stacking disorder in martensite with 3R close-packed structure

1971 ◽  
Vol 4 (4) ◽  
pp. 329-330 ◽  
Author(s):  
S. Kajiwara
Keyword(s):  
Electron Diffraction ◽  
Stacking Faults ◽  
Stacking Sequence ◽  
Close Packed Structure ◽  
Packed Structure ◽  
Stacking Disorder

The shift and diffuseness of electron diffraction spots due to stacking faults were observed in martensite crystals with 3R close-packed structure. The analysis of these shifted and diffused spots by the Kakinoki–Komura theory shows that 3R structure martensite is faulted in such a way that its stacking sequence changes to that of the 9R close-packed structure.

Surfactant-free Colloidal Crystal of ZnO Quantum Dots

2009 ◽  
Vol 1207 ◽  
Author(s):  
Xi Zhang ◽  
Dazhi Sun ◽  
Hung-Jue Sue
Keyword(s):  
Electron Microscopy ◽  
Quantum Dots ◽  
Colloidal Crystal ◽  
Uv Light ◽  
X Ray ◽  
Transmission Electron ◽  
Close Packed Structure ◽  
Packed Structure ◽  
Zno Quantum Dots ◽  
Zno Qds

AbstractMonodisperse ZnO quantum dots (QDs) with a particle size of about 5 nm have been synthesized. Isopropanol together with hexane were utilized to precipitate ZnO nanoparticles to form condensed phases, ranging from white flocculation, to gel-like fluid, and to transparent solid. The morphology and structure in the transparent ZnO solid was characterized by UV-vis, X-ray diffraction, small-angle X-ray scattering, transmission electron microscopy, and scanning electron microscopy. The mechanisms for the formation of transparent ZnO QDs close-packed structure were monitored via UV-vis spectra, and found likely to be a colloidal crystal. The colloidal crystal is transparent and absorbs UV light efficiently. Possible conditions for the formation of the ZnO QDs colloidal crystal are discussed.

A METHOD OF EXAMINING STRUCTURAL CHANGES OF METALS ON DEFORMATION IN LIQUID HELIUM: EXAMINATION OF INDIUM

1955 ◽  
Vol 33 (8) ◽  
pp. 473-475 ◽  
Author(s):  
W. B. Pearson
Keyword(s):  
Liquid Helium ◽  
Structural Changes ◽  
X Ray ◽  
Close Packed Structure ◽  
The Face ◽  
Packed Structure ◽  
Soft Metal ◽  
Face Centered ◽  
Slight Deformation

A Debye–Scherrer type of X-ray camera is described in which a soft metal can be deformed by extension and photographed in situ in liquid helium. Using this camera we have examined deformed indium at 4.2°K. and find no evidence of a lattice transformation when a tensile strain of ~ 15% is applied. The investigation was undertaken to examine the suggestion of Swenson, stemming from the observation of anomalies in the mechanical properties of indium at low temperatures, that a very slight deformation of indium at 4.2°K. might transform the face-centered tetragonal to a close-packed structure.

Structural and Electronic Studies of C60 Films Deposited Using a New Technique of Neutral Cluster Beam Deposition

1994 ◽  
Vol 349 ◽  
Author(s):  
Zhong-Min Ren ◽  
Zhi-Feng Ying ◽  
Xia-Xing Xiong ◽  
Mao-Qi He ◽  
Yuan-Cheng Du ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
X Ray Diffraction ◽  
Neutral Cluster ◽  
X Ray ◽  
Close Packed Structure ◽  
Oxygen Contamination ◽  
Packed Structure ◽  
A New Technique ◽  
Cluster Beams ◽  
Cluster Beam Deposition

ABSTRACTC50 films, are deposited on Si(111) substrates using neutral cluster beams of fullerenes generated from a crucible with a special nozzle. X-ray diffraction (XRD) have been used to investigate the structural properties of C50 films, which indicate highly textural films as close-packed structure with strong (110) XRD assignment and 400Å for correlation length. Raman spectrum indicates the existence of stable C60 films. X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) measurements are carried out to analyze the electronic properties of the films. The resistivity to contamination of C50 film deposited here is better than that deposited by MBE. Different kinds of oxygen contamination on the surfaces of C50 films and HDPG are detected by the results of O 1s XPS analyses.

The thermal transformation of datolite, CaBSiO4(OH), to boron-melilite

1973 ◽  
Vol 39 (302) ◽  
pp. 158-175 ◽  
Author(s):  
J. Tarney ◽  
A. W. Nicol ◽  
Giselle F. Marriner
Keyword(s):  
Activation Energy ◽  
Thermal Transformation ◽  
Kcal Mole ◽  
High Activation ◽  
X Ray ◽  
Close Packed Structure ◽  
Effective Removal ◽  
Packed Structure ◽  
New Phase ◽  
Tetrahedral Layer

SummaryA kinetic and X-ray study of the dehydroxylation of datolite, CaBSiO4(OH), has shown that the decomposition occurs very rapidly above 700°C in air, with an activation energy for the reaction of the order of 200 kcal mole −1. The transformation is topotactic, the dehydroxylated phase being tetragonal with a 7·14 Å, c 4·82 Å, and particularly well formed even at the lowest temperatures of decomposition. Single-crystal studies have shown that two orientations of the new phase exist and that the original a of datolite becomes the unique axis of the tetragonal phase while the tetragonal a axes are oriented either parallel to or at 45° to the b and c axes of datolite. The new phase appears to be a boron-containing analogue of the melilite structure, composition Ca2SiB2O7, but is metastable. The basic sheet structure is preserved during the transformation but a reorganization of the tetrahedral layer from the 4- and 8-membered rings of datolite to the 5-membered rings of the new phase is involved, together with effective removal of protons and some silicon. The transformation can be explained in terms of an inhomogeneous reaction mechanism involving migration of calcium and boron into the new phase domains and counter-migration of silicon and protons, but with only minor readjustment of oxygens. The high activation energy of the reaction is explicable in terms either of the effort necessary to remove silicon from the domains of the new phase or of the difficulty of moving the large calcium ions through a relatively close-packed structure.

Cu2ZnSnSe4 thin films prepared by selenization of precursor evaporated from Cu2ZnSnSe4 and Na2Se

2014 ◽  
Vol 1603 ◽  
Author(s):  
Mitsuki Nakashima ◽  
Toshiyuki Yamaguchi ◽  
Masanobu Izaki
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Thin Film Solar Cells ◽  
X Ray Diffraction ◽  
X Ray ◽  
Epma Analysis ◽  
Close Packed Structure ◽  
Columnar Grains ◽  
Packed Structure ◽  
Selenization Process

ABSTRACTCu2ZnSnSe4 thin films were prepared by using the synthesized Cu2ZnSnSe4 ingot and Na2Se powder at various Na2Se/Cu2ZnSnSe4 mole ratio as evaporation materials for selenization process. From EPMA analysis, the composition was approximately constant even if the Na2Se/Cu2ZnSnSe4 mole ratio increased. X-ray diffraction studies revealed that the thin films had a kesterite Cu2ZnSnSe4 structure and the foreign phases disappeared with increasing the Na2Se/Cu2ZnSnSe4 mole ratio. The Na2Se addition enhanced to grow thin films having a close-packed structure and columnar grains. The values of Voc and Isc in Cu2ZnSnSe4 thin film solar cells increased with increasing the Na2Se/Cu2ZnSnSe4 mole ratio.

Sign in / Sign up

Export Citation Format

Share Document