scholarly journals Quantitative Analysis of Phases in Zeolite Bearing Rocks from Full X-ray Diffraction Profiles

1988 ◽  
Vol 41 (2) ◽  
pp. 323 ◽  
Author(s):  
JC Taylor ◽  
SR Pecover
Keyword(s):  
Quantitative Analysis ◽  
Epoxy Resin ◽  
Preferred Orientation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Field Samples ◽  
Al Powder ◽  
Mineral Mixtures

It is shown that quantitative analysis of zeolite phases in mineral mixtures can be performed using calculated whole-pattern X-ray diffraction profiles and Bragg-Brentano patterns. The method was tested on binary and ternary standard mixtures containing quartz, heulandite, chabazite and stellerite, and gave zeolite weight percentages correct to within a few per cent. Structure analyses of the zeolites were necessary to obtain good calculated profiles. The platy zeolites heulimdite and stellerite had severe preferred orientation problems, which were minimised experimentally by adding Al powder diluent and an epoxy resin, and regrinding. Analyses of field samples are also described.

Quantitative Analysis of Sedimentary Minerals by Powder X-ray Diffraction

1986 ◽  
Vol 1 (2) ◽  
pp. 37-39 ◽  
Author(s):  
Peter Bayliss
Keyword(s):  
Quantitative Analysis ◽  
Crystallite Size ◽  
Sedimentary Environment ◽  
Preferred Orientation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Primary Extinction ◽  
Geological Formation ◽  
Analytical Procedures

AbstractThe variables of reflection overlap, crystallinity and crystallite size, primary extinction, microabsorption, chemical substitutions, preferred orientation, and analytical procedures affect quantitative analysis by powder X-ray diffraction. The intensity of the strongest reflection (I) of 39 minerals from a typical sedimentary environment divided by the intensity of the strongest reflection (Ic) of corundum, I/Ic, may be used to determine mineral percentages. Because of the numerous variables mentioned above, the I/Ic ratios used should be taken from multi-mineral specimens that occur either in the same geological formation for quantitative analysis (±7%) or in a similar geological formation for quantitative analysis (±30%).

An improved method for quantitative analysis of sedimentary minerals by X-ray diffraction

1996 ◽  
Vol 11 (3) ◽  
pp. 235-239 ◽  
Author(s):  
Wang Chao ◽  
Pan Chunde ◽  
Wang Daqing ◽  
Song Aixia ◽  
Nie Jihong ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Preferred Orientation ◽  
Improved Method ◽  
X Ray Diffraction ◽  
Absolute Deviation ◽  
X Ray ◽  
Sedimentary Environments ◽  
Loading Method ◽  
Intensity Ratios ◽  
Comparison Of The Results

An improved backloading method to determine the reference intensity ratios of sedimentary minerals is presented. More than 50 reference intensity ratios of more than ten types of minerals formed in typical sedimentary environments were measured. Quantitative tests were performed on those minerals. Comparison of the results show that this method minimizes preferred orientation and improves quantitative precision (absolute deviation is less than 3%) so that it is an acceptable specimen loading method.

Quantitative Analysis of Clay Mineral Mixtures by X-ray Diffraction

Nature ◽  
1964 ◽  
Vol 204 (4964) ◽  
pp. 1228-1230 ◽  
Author(s):  
A. A. THEISEN ◽  
E. BELLIS
Keyword(s):  
Quantitative Analysis ◽  
Clay Mineral ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mineral Mixtures

Fast quantitative analysis of strong uniaxial texture using a March–Dollase approach

2013 ◽  
Vol 46 (6) ◽  
pp. 1877-1879 ◽  
Author(s):  
Emil Zolotoyabko
Keyword(s):  
Quantitative Analysis ◽  
Intensity Ratio ◽  
Preferred Orientation ◽  
Diffraction Peak ◽  
X Ray Diffraction ◽  
Rocking Curve ◽  
X Ray ◽  
Diffraction Peaks ◽  
Analytical Expressions

Interrelations between the degree of uniaxial preferred orientation and the intensities and widths of selected X-ray diffraction peaks are analyzed within the March–Dollase approach. Simple analytical expressions are developed which relate the degree of preferred orientation to the rocking curve width of the strongest diffraction peak or the intensity ratio of two diffraction peaks, one of them being originated in the preferably orientated atomic planes.

A simple and low-cost solution for the automation of X-ray powder diffractometers with chart recorder output

2006 ◽  
Vol 39 (4) ◽  
pp. 626-629
Author(s):  
M. Jayaprakasan ◽  
V. Kannan ◽  
P. Ramasamy
Keyword(s):  
Quantitative Analysis ◽  
Low Cost ◽  
Hard Copy ◽  
X Ray Diffraction ◽  
Raw Data ◽  
Crystalline Materials ◽  
X Ray ◽  
Strip Chart ◽  
Controlled Systems ◽  
Chart Recorder

X-ray powder diffraction is an established method for the qualitative identification of crystalline materials and their quantitative analysis. The new generation of X-ray diffraction systems are based on expensive digital/embedded control technology and computer interfaces. Yet many laboratories use conventional manual-controlled systems withXYstrip-chart recorders. Since the output spectrum is a strip chart (hard copy), raw data, essential for structural and qualitative analysis, are not readily available for further analysis. Upgrading to modern computerized diffractometers is very expensive. The proposed automation design described here is intended to enable the conventional diffractometer user to collect, store and analyze data quickly. The design also improves the resolution by five times compared with the conventional setup. For the automation, a PC add-on card has been designed to control and collect the timing and intensity counts from the conventional X-ray diffractometer, and suitable software has been developed to collect, process and present the X-ray diffraction data for both qualitative and quantitative analysis. Moreover, a major advantage of this design is that it does not warrant any physical modification of the hardware of the conventional setup; it is simply an extension to enhance the performance of collecting raw data with a higher resolution at desired intervals/timings.

NbN Thin Film of Alternating Textures

2017 ◽  
Vol 898 ◽  
pp. 1431-1437
Author(s):  
Hong Yang Shao ◽  
Kan Zhang ◽  
Yi Dan Zhang ◽  
Mao Wen ◽  
Wei Tao Zheng
Keyword(s):  
Deposition Time ◽  
Peak Position ◽  
Preferred Orientation ◽  
Intrinsic Stress ◽  
Competitive Growth ◽  
X Ray Diffraction ◽  
X Ray ◽  
Orientation Distributions ◽  
Different Thickness ◽  
Deposited Films

The δ-NbN thin films with different thickness have been prepared by reactive magnetron sputtering at different deposition time and exhibited alternating textures between (111) and (200) orientations as a function of thickness. In addition, the grain size, peak position, morphology, residual stress and orientation distributions of the deposited films were explored by X-ray diffraction, low-angel X-ray reflectivity, scanning electron microscopy and surface profiler. The film deposited at 300 s showed a (111) preferred orientation, changing to (200) preferred orientation at 600 s, and exhibited alternating textures between (111) and (200) preferred orientations. With further increasing deposition time, in which (200) peak position and the full width at half maximum of (111) peak also displayed a trend of alternating variation with varying deposition time. The intrinsic stress for δ-NbN films calculated by Stoney equation alternately changed with alternating textures, in which (111) orientation always takes place at relatively high intrinsic stress state and vice versa. Meanwhile, the film with (111) preferred orientation showed higher density than (200) preferred orientation. The film deposited at 4800 s owned a mixed texture of (111) and (200), showing an anisotropy distribution of (111)-oriented and (200)-oriented grains, while film deposited at 7200 s owned a strong (200) texture, displaying an isotropy distribution of (200)-oriented grains. The competitive growth between (111)-oriented and (200)-oriented grains was responsibility for alternating texture.

Crystallization of simonkolleite (Zn5Cl2(OH)8 ∙ H2O) in powder samples prepared for mineral composition analysis by quantitative X-ray diffraction (QXRD)

Nafta-Gaz ◽  
2021 ◽  
Vol 77 (5) ◽  
pp. 293-298
Author(s):  
Urszula Zagórska ◽  
◽  
Sylwia Kowalska ◽  
Keyword(s):  
Quantitative Analysis ◽  
Internal Standard ◽  
Mineralogical Composition ◽  
Hydrocarbon Exploration ◽  
Composition Analysis ◽  
Internal Standard Method ◽  
X Ray Diffraction ◽  
Method Error ◽  
X Ray ◽  
Significant Difference

The analysis of mineralogical composition by quantitative X-ray diffraction (QXRD) is one of the standard research methods used in hydrocarbon exploration. In order to improve it and to obtain better results, the methodology of quantitative analysis used at Well Logging Department is being periodically (more or less) modified. After the introduction of the improvements, comparative analyses were performed on archival samples. Reflections from an unidentified phase which did not occur in the tested Rotliegend sandstone samples were noticed on X-ray diffractograms of archival samples. Reflections of a mineral called simonkolleite were identified in the X-ray diffraction database. Chemically it is a hydrated zinc chloride of the formula: Zn5Cl2(OH)8 × H2O. Analysis of the composition of samples in which simonkolleite crystallised, indicated that the mineral is being formed in the result of the slow reaction of zinc oxide with halite (NaCl) and water vapour. An attempt was made to determine the influence of the presence of this mineral on the results of the quantitative analysis of mineralogical composition. The above methodology was applied on a group of ten samples. The results of the quantitative analysis conducted for archival samples stored with added zincite standard containing simonkolleite and for new, freshly grinded (without artifact) samples were compared. The comparison of the obtained results showed a slight influence of this mineral on the quantitative composition of the remaining components. The difference between the results usually did not exceed the method error. At the same time a significant difference in the calculated content of the internal standard was noted – on average 1% less in archival than in new samples. This shows that the reaction occurring in the archival samples will affect the evaluation of the quality of the obtained quantitative analysis, at the same time excluding the possibility of determining the rock’s amorphous substance content with the internal standard method.

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