Electron crystallography of the polymethylene chain. 3. Three-dimensional crystal structure of a refined paraffin wax1

1999 ◽  
Vol 214 (6) ◽  
Author(s):  
D. L. Dorset
Keyword(s):  
Crystal Structure ◽  
Electron Diffraction ◽  
Three Dimensional ◽  
Intensity Data ◽  
Electron Crystallography ◽  
Diffraction Intensity ◽  
Orthorhombic Space Group ◽  
Oriented Samples ◽  
Commercial Paraffin Wax ◽  
Dimensional Crystal

AbstractThe three-dimensional crystal structure of a commercial paraffin wax has been determined from electron diffraction intensity data collected from epitaxially oriented samples. The orthorhombic space group is

Electron crystallography of zeolites. 1. Projected crystal structures of ZSM-5 and ZSM-11

2003 ◽  
Vol 218 (7) ◽  
Author(s):  
Douglas L. Dorset
Keyword(s):  
Crystal Structure ◽  
Electron Diffraction ◽  
Crystal Structures ◽  
Electron Scattering ◽  
Secondary Electron ◽  
Direct Methods ◽  
Intensity Data ◽  
Electron Crystallography ◽  
Diffraction Intensity

AbstractThe prospect of carrying out quantitative crystal structure analyses by direct methods with electron diffraction intensity data from zeolites is evaluated for two related materials: ZSM-5 and ZSM-11. The stacked plate-like arrays of ZSM-5 induce intensity perturbations from secondary electron scattering; nevertheless, the T-site positions can be found by direct methods. Intensity data from smaller ZSM-11 microcrystals are more favorable for

Electron crystallography of zeolites. 3. Calcined MCM-22 and MCM-49, a case of subtle differences

2003 ◽  
Vol 218 (9) ◽  
Author(s):  
Douglas L. Dorset
Keyword(s):  
Electron Diffraction ◽  
Single Crystal ◽  
Crystal Structures ◽  
Direct Methods ◽  
Intensity Data ◽  
Electron Crystallography ◽  
Diffraction Intensity ◽  
Crystal Electron

AbstractSingle crystal electron diffraction intensity data, analyzed by direct methods for determining crystallographic phases, have been employed to seek differences between the crystal structures of calcined MCM-22 and MCM-49. A direct comparison of

Electron crystallography of the polymethylene chain. 5. Three-dimensional structure of a Fischer-Tropsch wax

2001 ◽  
Vol 216 (4) ◽  
Author(s):  
Douglas L. Dorset
Keyword(s):  
Crystal Structure ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Dimensional Structure ◽  
Intensity Data ◽  
Electron Crystallography ◽  
Fischer Tropsch ◽  
Three Dimensional Structure ◽  
Polymethylene Chain ◽  
Layer Arrangement

AbstractThe crystal structure of a Fischer-Tropsch wax, Shell Callista 158, has bee determined in three dimensions from electron diffractio intensity data. Although there is an orthorhombic layer arrangement with apparent dimensions,

The crystal structure of dundasite

1972 ◽  
Vol 38 (297) ◽  
pp. 564-569 ◽  
Author(s):  
G. Cocco ◽  
L Fanfani ◽  
A. Nunzi ◽  
P. F. Zanazzi
Keyword(s):  
Crystal Structure ◽  
Structural Analysis ◽  
Three Dimensional ◽  
Water Molecules ◽  
Intensity Data ◽  
Chemical Formula ◽  
Orthorhombic Space Group ◽  
Coordination Polyhedra ◽  
Patterson Function ◽  
Pb Ions

SummaryThe crystal structure of dundasite from Gonnesa (Italy) was solved by a three-dimensional Patterson function computed using intensity data collected photographically by the Weissenberg method, and refined by successive Fourier maps and least-squares cycles to an R index 0·.066 for 505 independent observed reflections.The chemical formula resulting from the structural analysis is PbAl2(CO3)2(OH)4·H2O. The mineral is orthorhombic, space group Pbnm, with a 9·08 Å, b 16·37 Å, c 5·62 Å. The dundasite structure consists of a three-dimensional framework of coordination polyhedra around Pb and Al. Pb ions are coordinated by nine oxygen atoms with distances ranging from 2·53 to 2·91 Å. Al ions show the usual octahedral coordination with average Al-O distance 1.90 Å. C-O mean distances are 1·28 and 1·27 Å for the two non-equivalent CO3 groups. The water molecules are not coordinated by the cations.

Structure analysis of materials at the order–disorder borderline using three-dimensional electron diffraction

2019 ◽  
Vol 75 (4) ◽  
pp. 550-563 ◽  
Author(s):  
Enrico Mugnaioli ◽  
Tatiana E. Gorelik
Keyword(s):  
Crystal Structure ◽  
Electron Diffraction ◽  
Structure Analysis ◽  
Diffuse Scattering ◽  
Three Dimensional ◽  
Crystal Defects ◽  
Ideal Crystal ◽  
Dimensional Electron ◽  
Electron Crystallography ◽  
Nanocrystalline Structures

Diffuse scattering, observed as intensity distribution between the Bragg peaks, is associated with deviations from the average crystal structure, generally referred to as disorder. In many cases crystal defects are seen as unwanted perturbations of the periodic structure and therefore they are often ignored. Yet, when it comes to the structure analysis of nano-volumes, what electron crystallography is designed for, the significance of defects increases. Twinning and polytypic sequences are other perturbations from ideal crystal structure that are also commonly observed in nanocrystals. Here we present an overview of defect types and review some of the most prominent studies published on the analysis of defective nanocrystalline structures by means of three-dimensional electron diffraction.

A New Three Dimensional Crystal Structure of a Cadmium Thiolate

1995 ◽  
Vol 34 (19) ◽  
pp. 4926-4929 ◽  
Author(s):  
Tobias Vossmeyer ◽  
Guenter Reck ◽  
Lynne Katsikas ◽  
Erhard T. K. Haupt ◽  
Burkhard Schulz ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Three Dimensional ◽  
Dimensional Crystal

Protoenstatite: a crystal-structure refinement at 1100°C

1971 ◽  
Vol 134 (3-4) ◽  
Author(s):  
Joseph R. Smyth
Keyword(s):  
Crystal Structure ◽  
Melting Point ◽  
Single Crystal ◽  
Structure Refinement ◽  
Three Dimensional ◽  
Intensity Data ◽  
Crystal Structure Refinement ◽  
Space Group

AbstractTechniques allowing single-crystal investigations on the precession camera up to the melting point of platinum have been developed. The crystal structure of protoenstatite has been refined from three-dimensional intensity data obtained at 1100°C using a crystal of enstatite from the Norton County, Kansas meteorite. The space group is

Sign in / Sign up

Export Citation Format

Share Document