X-Ray-Quantitative Analysis of Multiphase Systems

The equation by which the X-ray diffra cted intensity of one component is related to the concentrations of all · components is unsuitable for studying multiphase systems without an internal standard. It is shown that even in such a case the concentration of one component can be expressed as a function of the characteristic X-ray diffracted intensities of all components of a multiphase system. One of them is chosen , at will, as the standard

The Crystal and Molecular Structure of Phthalyl-Urea

Using the methods of X-ray analysis we have shown that phthalyl-urea has the structure given by the formula (I). Thus we have confirmed the result previously obtained by V. Hah

Possible Correction of Preferential Orientation of Crystallites in Quantitative X-ray Determination by Means of Basal Reflections

In a previously published work1 we have described a method by which the intensity of an X-ray reflection that has been strengthened by preferential crystallite orientation can be corrected by measuring its ratio to the intensity of a reflection that is weakened by the same effect. In this way the intensity can be corrected to that given by a sample with a selected define degree of preferential orientation and then applied in quantitative analysis

The Crystal and Molecular Structure of Phthalyl-Urea

Using the methods of X-ray analysis we have shown that phthalyl-urea has the structure given by the formula (I). Thus we have confirmed the result previously obtained by V. Hah

Correction of Preferential Crystallite Orientation in X-ray Quantitative Analysis. Quantitative X:ray Determination of Ca (OH)2

The work deals with the problem of preferential orientation of crystallites in quantitafrwe X-ray analysis. A n ew method has been worked out theoretically. and practically for the correction of reflection intensities from \u27polycrystalline samples w ith preferentially oriented crystallites. Equations are included for the determination of correction parameters. Practical a pplication of the new method is demonstrated on quantitative X-ray analysis of calcium hydroxide. The work includes a calibration graph for the determination of coefficient a, comparing corrected and uncorrecte d values of analytical intensities of Ca(OH)2

Crystal and Molecular Structure of (S)- a -(p Chlorobenzenesulphonamido)- B-Propiothiolactone

These substances give by polymerization the optically active polythiolesters. The polymers may be of chemical and biological interest because they represent a new class of nonamide-bonded polycysteins. The proposed mechanism of polymerization4 suggests the opening of the B-propiothiolactone ring by S2-C8 bond rupture. It has been found that the rate of polymerization of substrates with different substituents on the benzene ring depends on the nature of the p~substituents

Determination of the X-Ray Diffraction Curve of Amorphous Phase

The method for determination of diffraction pattern of amorphous phase existing in a multiphase system has been described. In the course of analysis several samples containing different amounts of amorphous as well as crystalline phases have been involved according to the general theory for phase analysis. The method is based on the difference in convergence of Fourier series by which diffraction patterns of multiphase samples and of individual phases of these samples are defined, since diffraction pattern of amorphous phase exhibits stronger convergent Fourier series than diffraction pattern of crystalline phase. The method is illustrated by three-phase model system containing one amorphous phase

X-Ray-Quantitative Analysis of Multiphase Systems

The equation by which the X-ray diffra cted intensity of one component is related to the concentrations of all · components is unsuitable for studying multiphase systems without an internal standard. It is shown that even in such a case the concentration of one component can be expressed as a function of the characteristic X-ray diffracted intensities of all components of a multiphase system. One of them is chosen , at will, as the standard

An X-ray and Proton Magnetic Resonance Study of the Dehydration and Deuteration of Borax, Na2[B40s(OH)4] · 8 H20

A quantitative powder-x-ray analysis was developed for this case by which it was shown that carefully prepared borax dehydrates directly into an unhydrous amorphous phase. Eight molecul es of water are quantitatively lost on complete dehydration (below 50°C) as required by the structural formula.. The proton m agnetic resonance results agree with these findings showing also that the spectrum due to OH-groups changes considerably on dehydration. This was used ~n following deuteration (solid/gas) of dehydrated borax. The p.m.r. spectra, the x-ray di agrams, and the measured regain indicate ·a reconshltution of the borax- lattice towards the formula Na2,[B 40 5(0H) 4] • 8D 20

The Quantitative X-Ray Analysis of Bauxite. I. The System Hydrargillite-Boehmite-Goehtite-Haematite

A photographic X-Ray method for quantitative analysis of the main four- component system in bauxites is described. The required standard straigp.t lines are given. The use of the overl apping haematite- goehtite line (d = 2.69 A a nd d = 2.67 A resp.) is shown theoretically to be possible and is experimentally verified