Accuracy of XRPD QPA using the combined Rietveld–RIR method

By A. Gualtieri. 2000

436 citations recorded by the source corpus.

QPA (quantitative phase analysis) of polycrystalline materials using XRPD (X-ray powder diffraction) can be performed using the combined Rietveld and reference intensity ratio (RIR) methods, providing an estimate of both the crystalline and the amorphous phase in a mixture. Although the accuracy of estimates of the phase composition of simple ternary or quaternary mixtures is generally very good, uncertainties remain and bias the accuracy of phase determinations in complex systems such as pyroclastic rocks, which may contain two or more zeolite species, a number of other phases (generally up to four or five), and glass. The contribution of the incoherent scattering, biasing accuracy, in the glass determination has been discussed in an earlier work on the modal analysis of pyroclastic rocks [Gualtieri (1996). Powder Diffr. 11, 97–106]. In this work, the assumption of the crystal structure, the influence of the spike addition, background and atomic (thermal) displacement parameters are discussed. It is shown that the structure-model assumption no longer holds for systems containing complex phases such as zeolites, as the accuracy is degraded and, as far as the influence of the added spike is concerned, there is an underestimation of the glass content with increasing amounts of added spike.

Subfields: Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/83b01c8a60022742b2a5cb1f7ae239329f2d81be

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In Materials Chemistry

Citations in the corpus

X-ray Diffraction Techniques for Soil Mineral Identification (2015, background): “Full-pattern fitting for mineral quantification is most advantageous for mixtures of well-ordered minerals, but it has been applied successfully to soils and geologic materials (e.g., Jackman et al., 1997; Aylmore and Walker, 1998; Gualtieri, 2000; Jones et al., 2000; Plançon and Drits, 2000; Altoma”
Ceramic technology. How to reconstruct the firing process (2020, neutral): “8; however, according to Gualtieri (2000), it bears the (− 2 2 1) peak at 25.26° 2θ (8.69 intensity; 3.5391 Å), the (− 1 1 2) peak at 25.82° 2θ (46 intensity; 3.4633 Å), the (2 2 0) peak at 27.02° 2θ (100 intensity; 3.3124 Å), the (− 2 0 2) peak at 27.28° 2θ (67.8 intensity; 3.2812 Å) and the (0 4…”
Advances in alkali-activation of clay minerals (2020, methodology): “Lassinantti Gualtieri et al. [270] activated a kaolinitic lateritic soil with NaOH and Na2SiO3.xH2O – this apparently had no effect on the uncalcined soil, but a geopolymer formed as the main reaction product for the calcined soil.”