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Two examples of quantitative analysis by simulated X-ray powder diffraction patterns

Published online by Cambridge University Press:  09 July 2018

C. E. Corbato  and
R. T. Tettenhorst
C. E. Corbato
Affiliation:
Department of Geology & Mineralogy, The Ohio State University, Columbus, Ohio 43210, USA
R. T. Tettenhorst
Affiliation:
Department of Geology & Mineralogy, The Ohio State University, Columbus, Ohio 43210, USA
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Abstract

Quantitative estimates were made by visually matching computer-simulated with experimental X-ray powder diffractometer patterns for two samples. One was a natural mixture of dickite and nacrite in about equal proportions. The second sample contained mostly quartz with corundum and mullite in small (0.5–1%) amounts. Percentages deduced from pattern matching agreed to within ±10% of the weight fractions of the components determined by an alternative method of analysis.

Resume

Resume

Les estimations quantitatives sont effectuées par comparaison visuelle entre les diagrammes expérimentaux de diffraction de rayons X de poudre et de ceux simulés par ordinateur. Un des deux exemples est un mélange naturel de dickite et de nacrite de quantités peu près égales. Le deuxième échantillon contient essentiellement du quartz avec du corindon et de la mullite en faibles proportions (0.5–1%). Les pourcentages déduits de la comparaison des diagrammes sont en accord à ± 10% près avec les compositions pondérales dérminées par une autre méthode d'analyse.

Kurzreferat

Kurzreferat

Quantitative Mineralbestimmungen durch optischen Vergleich von gemessenen und berechneten Röntgenbeugungsdiagrammen ergaben bei Mineralgemischen eine Übereinstimmung innerhalb von ± 10% mit den Gewichtsanteilen der einzelnen Fraktionen nach anderen Methoden. Das Verfahren wurde an einem natürlichen Gemisch aus ungefähr gleichen Mengenanteilen Dickit und Nakrit sowie an einer Probe geprüft, die hauptsächlich Quartz mit wenig Korund und Mullit (0.5–1%) enthielt.

Resumen

Resumen

Se ha hecho el análisis cuantitativo por difracción de rayos X de dos muestras, comparando visualmente los diagramas de polvo experimentales con los calculados. Una de las muestras era una mezcla natural al 50% de dickita y nacrita. La segunda muestra contenia cuarzo mayoritariamente, con pequeñas cantidades de corindón y mullita (0.5–1%). Los porcentajes deducidos del ajuste de los diagramas concuerdan (±10%) con los valores determinados por otro método de análisis.

Type
Research Article
Information
Clay Minerals , Volume 17 , Issue 4 , December 1982 , pp. 393 - 399
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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