The Rietveld method applied to quantitative phase analysis of minerals containing disordered structures

The Rietveld method was successfully used for the quantitative phase analysis of zeolitized rocks containing montmorillonite, a phase in which the atomic positions cannot be determined exactly. The freely distributed program FULLPROF was used in its profile-matching mode with CuKalpha X-ray data. Th...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Bonetto,Rita D, Zalba,Patricia E, Conconi,María S, Manassero,Marcelo
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2003
Materias:	Rietveld method Quantitative analysis Disordered structures Clinoptilolite Montmorillonite
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082003000100007
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0716-02082003000100007
record_format	dspace
spelling	oai:scielo:S0716-020820030001000072003-10-21The Rietveld method applied to quantitative phase analysis of minerals containing disordered structuresBonetto,Rita DZalba,Patricia EConconi,María SManassero,Marcelo Rietveld method Quantitative analysis Disordered structures Clinoptilolite Montmorillonite The Rietveld method was successfully used for the quantitative phase analysis of zeolitized rocks containing montmorillonite, a phase in which the atomic positions cannot be determined exactly. The freely distributed program FULLPROF was used in its profile-matching mode with CuKalpha X-ray data. This program permits carrying out quantitative analysis without using structural data for one of the phases. This method was applied to a set of reference mixtures of kaolinite and quartz, in order to show its effectiveness compared to normal refinement. The composition of these synthetic mixtures covered the range between 10 wt% and 90 wt% of both components. The absolute errors were lower than 5 wt%. Also, a set of artificial mixtures of quartz, clinoptilolite, and montmorillonite were quantified with the profile-matching mode applied to montmorillonite. The absolute errors were lower than 6 wt%. Ten different measurements and refinements were carried out on one of these samples to obtain estimates of the true standard deviations of the concentrations. The average error values obtained are similar to the error reported by the FULLPROF program from a single refinement. The application of the method to two zeolitized tuffs of the Chubut Group, Patagonia, Argentina, with different percentages of clinoptilolite, quartz, feldspars, and clay minerals resulted in an absolute error of 3 wt% (compared to the results estimated by chemical and thermogravimetric analysis). For the zeolite phase (clinoptilolite), it was necessary to refine the occupation parameters of the exchangeable cations and the structural water molecules. The results indicate that quantitative analysis by the Rietveld method, using the FULLPROF program in the profile-matching mode for one of the phases, may be used as a routine tool for the characterization of mineral samples that contain phases with disordered structures.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Revista geológica de Chile v.30 n.1 20032003-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082003000100007en10.4067/S0716-02082003000100007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Rietveld method Quantitative analysis Disordered structures Clinoptilolite Montmorillonite
spellingShingle	Rietveld method Quantitative analysis Disordered structures Clinoptilolite Montmorillonite Bonetto,Rita D Zalba,Patricia E Conconi,María S Manassero,Marcelo The Rietveld method applied to quantitative phase analysis of minerals containing disordered structures
description	The Rietveld method was successfully used for the quantitative phase analysis of zeolitized rocks containing montmorillonite, a phase in which the atomic positions cannot be determined exactly. The freely distributed program FULLPROF was used in its profile-matching mode with CuKalpha X-ray data. This program permits carrying out quantitative analysis without using structural data for one of the phases. This method was applied to a set of reference mixtures of kaolinite and quartz, in order to show its effectiveness compared to normal refinement. The composition of these synthetic mixtures covered the range between 10 wt% and 90 wt% of both components. The absolute errors were lower than 5 wt%. Also, a set of artificial mixtures of quartz, clinoptilolite, and montmorillonite were quantified with the profile-matching mode applied to montmorillonite. The absolute errors were lower than 6 wt%. Ten different measurements and refinements were carried out on one of these samples to obtain estimates of the true standard deviations of the concentrations. The average error values obtained are similar to the error reported by the FULLPROF program from a single refinement. The application of the method to two zeolitized tuffs of the Chubut Group, Patagonia, Argentina, with different percentages of clinoptilolite, quartz, feldspars, and clay minerals resulted in an absolute error of 3 wt% (compared to the results estimated by chemical and thermogravimetric analysis). For the zeolite phase (clinoptilolite), it was necessary to refine the occupation parameters of the exchangeable cations and the structural water molecules. The results indicate that quantitative analysis by the Rietveld method, using the FULLPROF program in the profile-matching mode for one of the phases, may be used as a routine tool for the characterization of mineral samples that contain phases with disordered structures.
author	Bonetto,Rita D Zalba,Patricia E Conconi,María S Manassero,Marcelo
author_facet	Bonetto,Rita D Zalba,Patricia E Conconi,María S Manassero,Marcelo
author_sort	Bonetto,Rita D
title	The Rietveld method applied to quantitative phase analysis of minerals containing disordered structures
title_short	The Rietveld method applied to quantitative phase analysis of minerals containing disordered structures
title_full	The Rietveld method applied to quantitative phase analysis of minerals containing disordered structures
title_fullStr	The Rietveld method applied to quantitative phase analysis of minerals containing disordered structures
title_full_unstemmed	The Rietveld method applied to quantitative phase analysis of minerals containing disordered structures
title_sort	rietveld method applied to quantitative phase analysis of minerals containing disordered structures
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2003
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082003000100007
work_keys_str_mv	AT bonettoritad therietveldmethodappliedtoquantitativephaseanalysisofmineralscontainingdisorderedstructures AT zalbapatriciae therietveldmethodappliedtoquantitativephaseanalysisofmineralscontainingdisorderedstructures AT conconimarias therietveldmethodappliedtoquantitativephaseanalysisofmineralscontainingdisorderedstructures AT manasseromarcelo therietveldmethodappliedtoquantitativephaseanalysisofmineralscontainingdisorderedstructures AT bonettoritad rietveldmethodappliedtoquantitativephaseanalysisofmineralscontainingdisorderedstructures AT zalbapatriciae rietveldmethodappliedtoquantitativephaseanalysisofmineralscontainingdisorderedstructures AT conconimarias rietveldmethodappliedtoquantitativephaseanalysisofmineralscontainingdisorderedstructures AT manasseromarcelo rietveldmethodappliedtoquantitativephaseanalysisofmineralscontainingdisorderedstructures
_version_	1718439417072320512

The Rietveld method applied to quantitative phase analysis of minerals containing disordered structures

Ejemplares similares