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Digitale Medien

Application of x-ray microprobe technique to clay minerals: Vermiculite (1983)

Patel, M.

New York, NY [u.a.] : Wiley-Blackwell

X-Ray Spectrometry 12 (1983), S. 42-46

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ISSN: 0049-8246

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Physik

Notizen: The usual method of polishing the surface of a solid sample for examination using the x-ray microprobe technique cannot be adopted for clay minerals. A modified method is suggested and its validity is tested using vermiculite mineral. It is observed that precision of quantitative elemental analysis increases significantly according to the present pretreatment procedure; variation from values obtained by wet chemical method is 〈 1% for SiO2, MgO and Fe2O3 and 2-3% for the rest. However, values obtained with the x-ray microprobe technique vary enormously from point to point and this non-uniformity is explained in terms of the structural characteristics of the clay mineral. The variation increases with the rise in temperature of treatment due to structural modifications occurring during heat treatment. The x-ray microprobe technique has been found to be quite effective in determination of trace elements such as K and Ti.

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/xrs.1300120110

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Digitale Medien

Single crystal Raman spectra of magnesium and zinc perchlorate hexahydrates (1983)

Patel, M. B. ; Agarwal, Anshu ; Bist, H. D.

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 14 (1983), S. 406-409

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Details

ISSN: 0377-0486

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Raman spectra of Mg(ClO4)2·6H2O and Zn(ClO4)2·6H2O single crystals have been recorded in the region 4000-20 cm-1 using an Ar+ laser as a source of excitation. The polarization behaviour of the Raman lines under different crystal orientations is reported. It is shown that the water molecules lie almost in a plane perpendicular to the crystal c-axis.

Zusätzliches Material: 4 Ill.