scholarly journals Determination of crystal size distributions in alumina ceramics by a novel X-ray diffraction procedure

2017 ◽  
Vol 101 (3) ◽  
pp. 1381-1392 ◽  
Author(s):  
Sigmund H. Neher ◽  
Helmut Klein ◽  
Werner F. Kuhs
Keyword(s):  
Crystal Size ◽  
Size Distributions ◽  
Alumina Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crystal Size Distributions

Statistical Inference, Size Distributions and Peak Broadening in Finite Crystals

1987 ◽  
Vol 2 (4) ◽  
pp. 220-224 ◽  
Author(s):  
A. G. Alvarez ◽  
R. D. Bonetto ◽  
D. M. A. Guérin ◽  
A. Plastino ◽  
L. Rebollo Neira
Keyword(s):  
Information Theory ◽  
Statistical Inference ◽  
Diffraction Data ◽  
Crystal Size ◽  
The Other ◽  
Size Distributions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crystal Size Distributions ◽  
Peak Broadening

AbstractCalculations of crystal size distributions in oriented clays (montmorillonite and kaolinite) are carried out utilizing X-ray diffraction data together with a method based on information theory. Two different procedures for dealing with the available data are compared. One of them involves some points of the corresponding spectrum, the other correlates the data by means of their moments.

scholarly journals FXD-CSD-GUI: a graphical user interface for the X-ray-diffraction-based determination of crystallite size distributions

2019 ◽  
Vol 52 (6) ◽  
pp. 1437-1439
Author(s):  
Sigmund H. Neher ◽  
Helmut Klein ◽  
Werner F. Kuhs
Keyword(s):  
User Interface ◽  
Graphical User Interface ◽  
Crystal Size ◽  
Data Handling ◽  
Size Distributions ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
User Friendly

Bragg intensities can be used to analyse crystal size distributions in a method called FXD-CSD, which is based on the fast measurement of many Bragg spots using two-dimensional detectors. This work presents the Python-based software and its graphical user interface FXD-CSD-GUI. The GUI enables user-friendly data handling and processing and provides both graphical and numerical crystal size distribution results.

The determination of crystal size and disorder from X-ray diffraction photographs of polymer fibres. 1. The accuracy of determination of Fourier coefficients of the intensity profile of a reflection

1989 ◽  
Vol 22 (4) ◽  
pp. 363-371 ◽  
Author(s):  
R. Somashekar ◽  
I. H. Hall ◽  
P. D. Carr
Keyword(s):  
Crystal Size ◽  
Fourier Coefficients ◽  
Intensity Profile ◽  
X Ray Diffraction ◽  
Scattering Angle ◽  
X Ray ◽  
Fourier Cosine ◽  
High Harmonics ◽  
Lattice Planes

Methods which determine the number and disorder of lattice planes in a crystal from the Fourier cosine coefficients of the intensity profile of an X-ray reflection use only the low harmonics and require that the coefficients be normalized so that the zero harmonic is unity. Experimentally, the profiles can only be recorded over a smaller range of scattering angle than required by the theory, and it is necessary to subtract background, which is likely to be estimated with considerable error, before determining the coefficients. It is shown that with polymer fibres this causes serious errors in the normalization, and in the values of those low harmonics used in the size and disorder determination, and prevents reliable values being obtained. Methods which avoid normalization and use only high harmonics are needed. It is shown that disorder may be obtained in such a way, but not size, for which low-order normalized coefficients are essential. A method of extrapolation is described and tested which enables the accurate high harmonics to be used to improve the estimates of the low ones. Whilst this will yield more reliable values of crystal size than are obtainable from existing methods, the accuracy depends entirely on the validity of the extrapolation, which cannot be tested in many cases of interest.

scholarly journals Determination of Ice Crystal Size Distributions in Frozen Desserts

1991 ◽  
Vol 74 (10) ◽  
pp. 3334-3344 ◽  
Author(s):  
D.P. Donhowe ◽  
R.W. Hartel ◽  
R.L. Bradley
Keyword(s):  
Crystal Size ◽  
Size Distributions ◽  
Ice Crystal ◽  
Crystal Size Distributions ◽  
Ice Crystal Size

Sem and X-Ray Analysis of Renal and Biliary Calculi

1976 ◽  
Vol 34 ◽  
pp. 306-307
Author(s):  
R. J. Narconis ◽  
G. L. Johnson
Keyword(s):  
Chemical Constituents ◽  
Natural State ◽  
X Ray Diffraction ◽  
Chemical Methods ◽  
X Ray ◽  
Additional Dimension ◽  
Biliary Calculi ◽  
Calculus Formation ◽  
Scanning Electron

Analysis of the constituents of renal and biliary calculi may be of help in the management of patients with calculous disease. Several methods of analysis are available for identifying these constituents. Most common are chemical methods, optical crystallography, x-ray diffraction, and infrared spectroscopy. The application of a SEM with x-ray analysis capabilities should be considered as an additional alternative.A scanning electron microscope equipped with an x-ray “mapping” attachment offers an additional dimension in its ability to locate elemental constituents geographically, and thus, provide a clue in determination of possible metabolic etiology in calculus formation. The ability of this method to give an undisturbed view of adjacent layers of elements in their natural state is of advantage in determining the sequence of formation of subsequent layers of chemical constituents.

New Coordination Compounds of Fe(III) with Organic Ligands

2009 ◽  
Vol 59 (12) ◽  
Author(s):  
Mihaela Flondor ◽  
Ioan Rosca ◽  
Doina Sibiescu ◽  
Mihaela-Aurelia Vizitiu ◽  
Daniel-Mircea Sutiman ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Complex Compounds ◽  
Organic Ligands ◽  
X Ray Diffraction ◽  
X Ray ◽  
Elemental Chemical Analysis ◽  
Structural Formulae ◽  
Paramagnetic Properties

In this paper the synthesis and the study of some complex compounds of Fe(III) with ligands derived from: 2-(4-chloro-phenylsulfanyl)-1-(2-hydroxy-3,5-diiodo-phenyl)-ethanone (HL1), 1-(3,5-dibromo-2-hydroxy-phenyl)-2-phenylsulfanyl-ethanone(HL2), and 2-(4-chloro-phenylsulfanyl)-1-(3,5-dibromo-2-hydroxy-phenyl)-ethanone (HL3) is presented. The characterization of these complexes is based on method as: the elemental chemical analysis, IR and ESR spectroscopy, M�ssbauer, the thermogravimetric analysis and X-ray diffraction. Study of the IR and chemical analysis has evidenced that the precipitates form are a complexes and the combination ratio of M:L is 1:2. The central atoms of Fe(III) presented paramagnetic properties and a octaedric hybridization. Starting from this precipitation reactions, a method for the gravimetric determination of Fe(III) with this organic ligands has been possible. Based on the experimental data on literature indications, the structural formulae of the complex compounds are assigned.

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