Abstract
Microcline + albite and albite + quartz standard mixtures were quantitatively analyzed using Rietveld refinement to investigate the reliability of the method. The method was also applied to the determination of weight percentages of component minerals in a perthite sample. The analysis resulted in a standard deviation of approximately 1 wt% for the microcline + albite mixtures and 4 wt% for the albite + quartz mixtures, indicating that the accuracy of quantitative Rietveld analysis is for better than that of conventional XRD methods in which only a few select peaks are used. The inclusion of the Dollase-March preferred-orientation correction function slightly improved the accuracy of the results. That function also improved the rate of convergence and the accuracy of unit-cell parameters. However, the Rietveld-Toraya correction function did not work well with the quantitative analyses. The result of the quantitative analysis of the albite + quartz mixtures was poorer than that of the microcline + albite mixtures, and the weight fraction of albite tended to be overestimated. The analytical result of the microcline + albite mixtures implies that the Rietveld method is more accurate when component minerals have similar preferred-orientation characteristics. However, if component minerals have different crystal habits, as represented by the albite + quartz mixtures, the deviation is much greater and systematic errors may occur. Quantitative phase analysis of a perthite specimen using the Rietveld method resulted in very accurate values for the mineral proportion and unitcell parameters of the constituent alkali feldspars, demonstrating the power of the Rietveld method to analyze multiphase samples.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1133-1140 |
| Number of pages | 8 |
| Journal | American Mineralogist |
| Volume | 81 |
| Issue number | 9-10 |
| State | Published - Sep 1996 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Geochemistry and Petrology
- Geophysics
Cite this
Quantitative analysis of alkali feldspar minerals using Rietveld refinement of X-ray diffraction data. / Shim, Sang-Heon; Kim, Soo Jin; Ahn, Jung Ho.
In: American Mineralogist, Vol. 81, No. 9-10, 09.1996, p. 1133-1140.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Quantitative analysis of alkali feldspar minerals using Rietveld refinement of X-ray diffraction data
AU - Shim, Sang-Heon
AU - Kim, Soo Jin
AU - Ahn, Jung Ho
PY - 1996/9
Y1 - 1996/9
N2 - Microcline + albite and albite + quartz standard mixtures were quantitatively analyzed using Rietveld refinement to investigate the reliability of the method. The method was also applied to the determination of weight percentages of component minerals in a perthite sample. The analysis resulted in a standard deviation of approximately 1 wt% for the microcline + albite mixtures and 4 wt% for the albite + quartz mixtures, indicating that the accuracy of quantitative Rietveld analysis is for better than that of conventional XRD methods in which only a few select peaks are used. The inclusion of the Dollase-March preferred-orientation correction function slightly improved the accuracy of the results. That function also improved the rate of convergence and the accuracy of unit-cell parameters. However, the Rietveld-Toraya correction function did not work well with the quantitative analyses. The result of the quantitative analysis of the albite + quartz mixtures was poorer than that of the microcline + albite mixtures, and the weight fraction of albite tended to be overestimated. The analytical result of the microcline + albite mixtures implies that the Rietveld method is more accurate when component minerals have similar preferred-orientation characteristics. However, if component minerals have different crystal habits, as represented by the albite + quartz mixtures, the deviation is much greater and systematic errors may occur. Quantitative phase analysis of a perthite specimen using the Rietveld method resulted in very accurate values for the mineral proportion and unitcell parameters of the constituent alkali feldspars, demonstrating the power of the Rietveld method to analyze multiphase samples.
AB - Microcline + albite and albite + quartz standard mixtures were quantitatively analyzed using Rietveld refinement to investigate the reliability of the method. The method was also applied to the determination of weight percentages of component minerals in a perthite sample. The analysis resulted in a standard deviation of approximately 1 wt% for the microcline + albite mixtures and 4 wt% for the albite + quartz mixtures, indicating that the accuracy of quantitative Rietveld analysis is for better than that of conventional XRD methods in which only a few select peaks are used. The inclusion of the Dollase-March preferred-orientation correction function slightly improved the accuracy of the results. That function also improved the rate of convergence and the accuracy of unit-cell parameters. However, the Rietveld-Toraya correction function did not work well with the quantitative analyses. The result of the quantitative analysis of the albite + quartz mixtures was poorer than that of the microcline + albite mixtures, and the weight fraction of albite tended to be overestimated. The analytical result of the microcline + albite mixtures implies that the Rietveld method is more accurate when component minerals have similar preferred-orientation characteristics. However, if component minerals have different crystal habits, as represented by the albite + quartz mixtures, the deviation is much greater and systematic errors may occur. Quantitative phase analysis of a perthite specimen using the Rietveld method resulted in very accurate values for the mineral proportion and unitcell parameters of the constituent alkali feldspars, demonstrating the power of the Rietveld method to analyze multiphase samples.
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UR - http://www.scopus.com/inward/citedby.url?scp=8344273611&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:8344273611
VL - 81
SP - 1133
EP - 1140
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 9-10
ER -