Quantitative phase analysis by X-ray diffraction – Simple routes

Stanko Popović

Abstract


        The elemental composition of a multiphase material can be obtained by means of chemical and spectroscopic techniques. However, these techniques face a great difficulty in distinguishing the chemical identity of the phases present in the material and in derivation of the fractions of particular phases. X-ray powder diffraction seems to be an ideal technique for the analysis of a multiphase material. Each crystalline phase of the material gives its characteristic diffraction pattern independently of the other phases; this fact makes it possible to identify the phase of interest and to determine its fraction. The intensities of diffraction lines of a given phase are proportional to its fraction and an appropriate quantitative analysis can be performed after the application of the correction for the absorption of X-rays in the material.

        The principles of quantitative X-ray diffraction phase analysis of a multiphase material are presented, with a special attention paid to the doping methods. The following methods are described: (i) determination of the fraction of a phase using repeated dopings, (ii) determination of the fraction of a phase using a single doping, (iii) simultaneous determination of the fractions of several phases using a single doping; (iv) determination of the fraction of the dominant phase. The applicability of the doping methods is stated and the optimum conditions to minimize systematic errors are discussed. Recent approaches in quantitative X-ray diffraction phase analysis are also mentioned in short.


Keywords


X-ray powder diffraction; quantitative phase analysis; doping methods

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References


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DOI: http://dx.doi.org/10.20450/mjcce.2015.643

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