scholarly journals Detection of fatigue damage by the use of position-sensitive detector - Singularity of change in X-ray diffraction profile.

1986 ◽  
Vol 35 (394) ◽  
pp. 737-742
Author(s):  
Tadao KOHNO ◽  
Hiroyuki FUJIMOTO ◽  
Masayoshi KOHARA
Keyword(s):  
Fatigue Damage ◽  
Position Sensitive Detector ◽  
Sensitive Detector ◽  
X Ray Diffraction ◽  
Diffraction Profile ◽  
X Ray ◽  
Position Sensitive

Control of the phase composition of advanced calcium phosphates using an x-ray diffractometer with a curved position-sensitive detector

2020 ◽  
Vol 86 (6) ◽  
pp. 29-35
Author(s):  
V. P. Sirotinkin ◽  
O. V. Baranov ◽  
A. Yu. Fedotov ◽  
S. M. Barinov
Keyword(s):  
Phase Composition ◽  
Calcium Phosphates ◽  
Position Sensitive Detector ◽  
Sensitive Detector ◽  
X Ray Diffraction ◽  
X Ray ◽  
Impurity Phases ◽  
Position Sensitive ◽  
Diffraction Peaks ◽  
Diffraction Patterns

The results of studying the phase composition of advanced calcium phosphates Ca10(PO4)6(OH)2, β-Ca3(PO4)2, α-Ca3(PO4)2, CaHPO4 · 2H2O, Ca8(HPO4)2(PO4)4 · 5H2O using an x-ray diffractometer with a curved position-sensitive detector are presented. Optimal experimental conditions (angular positions of the x-ray tube and detector, size of the slits, exposure time) were determined with allowance for possible formation of the impurity phases during synthesis. The construction features of diffractometers with a position-sensitive detector affecting the profile characteristics of x-ray diffraction peaks are considered. The composition for calibration of the diffractometer (a mixture of sodium acetate and yttrium oxide) was determined. Theoretical x-ray diffraction patterns for corresponding calcium phosphates are constructed on the basis of the literature data. These x-ray diffraction patterns were used to determine the phase composition of the advanced calcium phosphates. The features of advanced calcium phosphates, which should be taken into account during the phase analysis, are indicated. The powder of high-temperature form of tricalcium phosphate strongly adsorbs water from the environment. A strong texture is observed on the x-ray diffraction spectra of dicalcium phosphate dihydrate. A rather specific x-ray diffraction pattern of octacalcium phosphate pentahydrate revealed the only one strong peak at small angles. In all cases, significant deviations are observed for the recorded angular positions and relative intensity of the diffraction peaks. The results of the study of experimentally obtained mixtures of calcium phosphate are presented. It is shown that the graphic comparison of experimental x-ray diffraction spectra and pre-recorded spectra of the reference calcium phosphates and possible impurity phases is the most effective method. In this case, there is no need for calibration. When using this method, the total time for analysis of one sample is no more than 10 min.

Absorption corrections and digital filtering of X-ray diffraction profiles recorded with a position-sensitive detector

1985 ◽  
Vol 18 (6) ◽  
pp. 487-492 ◽  
Author(s):  
A. Burian ◽  
P. Lecante ◽  
A. Mosset ◽  
J. Galy ◽  
J. Van Dun ◽  
...  
Keyword(s):  
Digital Filtering ◽  
Position Sensitive Detector ◽  
Correction Function ◽  
Sensitive Detector ◽  
X Ray Diffraction ◽  
X Ray ◽  
Absorption Correction ◽  
Pertinent Information ◽  
Position Sensitive ◽  
Transmission And Reflection

Expressions for the absorption correction function are obtained in the form of integral equations for the case of a flat-plate sample and a position-sensitive detector. It is shown that the absorption correction used for both transmission and reflection geometries with a conventional diffractometer may be applied to a diffractometer equipped with a linear position-sensitive detector. The application of a Savitzky–Golay-type digital filter considerably facilitates the analysis of the data without losing pertinent information.

Automated Quantitative Multiphase Analysis Using a Focusing Transmission Diffractometer in Conjunction With a Curved Position Sensitive Detector

1987 ◽  
Vol 31 ◽  
pp. 325-330
Author(s):  
B. A. Foster ◽  
E. R. Wolfel
Keyword(s):  
Scintillation Counter ◽  
Position Sensitive Detector ◽  
Transmission Factor ◽  
Sensitive Detector ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sample Matrix ◽  
Position Sensitive ◽  
Transmission Measurements ◽  
Automatic Focusing

The method for quantitative X-ray diffraction analysis of multiphase mixtures presented here is based on transmission measurements of thin samples. The integral of all reflections of interest are measured with a position sensitive detector at one time while the transmission factor of the sample is measured simultaneously with a scintillation counter. The method has the advantages that only a few (1-5) mg of substance are required, absorption effects due to sample matrix are measured directly and the method is automated. The measurements are made with the STOE/ Nicolet Automatic Focusing X-ray Diffraction system in conjunction with the STOE/Nicolet Curved Position Sensitive Detector.

Mineral Phase Identificaticn Along two Profiles from the LRW French Reference Glass: Use of an X-Ray Position Sensitive Detector

1987 ◽  
Vol 112 ◽  
Author(s):  
J. Caurel ◽  
D. Beaufort ◽  
E. Y. Vernaz
Keyword(s):  
Solid Angle ◽  
Position Sensitive Detector ◽  
X Rays ◽  
Sensitive Detector ◽  
X Ray Diffraction ◽  
X Ray ◽  
Small Areas ◽  
Experimental Assembly ◽  
Position Sensitive

AbstractThis study was undertaken to clarify the alteration process of French LWR synthetic glass leached by distilled water at 250 and 300°C for 28 days. The present experiments emphasize “in situ” identification of the alteration products in small areas (20 × 10−4 mm2 ) along the alteration profile by a specific X-ray diffraction technique.Experimental assembly: The sample is irradiated by an incident X-ray beam (Co k α, 40 mA, 40 Kv) focused to a 150 μ m diameter. The sample oscillates around a θ central selected position and the diffracted X-rays are detected simultaneously in a 14.5 (2 θ ) solid angle, then recorded by the linear position sensitive detector and stored in a multichannel analyzer.

Sign in / Sign up

Export Citation Format

Share Document