Methods of crystallography: powder X-ray diffraction

Altomare, Angela; Cuocci, Corrado; Gatta, G. Diego; Moliterni, Anna; Rizzi, Rosanna

doi:10.1180/emu-notes.19.3

Cited by 5 publications

(5 citation statements)

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“…However, weak diffraction peaks suggest the presence of a low fraction of franklinite also in the S10 sample. The weight fraction (wt%) of the different phases was determined by Rietveld full-profile fit on the SR-XRD patterns [55]. The data indicate that the amount of LTA formed by conventional hydrothermal method ranges from ∼91wt% in S5 to ∼98wt % in S3.…”

Section: Resultsmentioning

confidence: 99%

Effect of red mud added to zeolite LTA synthesis: Where is Fe in the newly-formed material?

Belviso

Cannas

Pinna

et al. 2020

Microporous and Mesoporous Materials

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Section: Resultsmentioning

confidence: 99%

Effect of red mud added to zeolite LTA synthesis: Where is Fe in the newly-formed material?

Belviso

Cannas

Pinna

et al. 2020

Microporous and Mesoporous Materials

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“…) by the Rietveld method (Rietveld ; Altomare et al . ) using the GSAS package (with a pseudo‐Voigt profile function and a Chebyshev‐type polynomial to model the background curves; see Larson and Von Dreele ) and a combination of both, with ranciéite fraction higher than that of birnessite, showed the best fit with the ‘observed’ diffraction patterns. This finding proved that ranciéite and birnessite coexist in all the samples of this study (Table ).…”

Section: Resultsmentioning

confidence: 99%

The dark colour of the Ploutonion at Hierapolis of Phrygiae (Turkey)

et al. 2018

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The dark colour of some excavated architectural elements of the Ploutonion, in the archaeological site of Hierapolis of Phrygiae (Turkey), was investigated. The Ploutonion, visited by numerous ancient writers, such as Cicero and Strabo, was a sanctuary dedicated to Pluto and Kore, constructed during the early Imperial period above the entrance to a natural cave, from which thermal waters and poisonous gases emerge. It was used for sacred rituals: sacrifices, incubation and healing. A multi-analytical approach (X-ray diffraction, X-ray fluorescence, optical and electronic microscopy, and chemical analyses of the thermal spring water) was used in order to define the composition and origin of darkening phenomena of some architectural elements of the Ploutonion.

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“…A Bruker D8 DISCOVER (Bruker AXS, Frankfurt am Main, Germany) X-ray diffractometer with CuKα radiation was used for the phase analysis of the synthesized layers. The content of the phases in the surface layer was determined according to the X-ray diffraction patterns using the Rietveld method, using the FullProf software [72][73][74].…”

Section: Methodsmentioning

confidence: 99%

The Tribological Properties of Plasma Electrolytic Oxidation Layers Synthesized on Arc Spray Coatings on Aluminum Alloys in Contact with Various Friction Materials

Hvozdets’kyi,

Padgurskas,

Student

et al. 2024

Coatings

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Oxide layers on the surface of the aluminum alloys D16 and AMg6 and on arc coatings sprayed with electrode wires made of the alloys D16 and AMg6 were synthesized using plasma electrolytic oxidation (PEO). The microstructure, phase composition and micro-hardness of the PEO layers were studied. In addition to the two main phases (α-Al2O3 and γ-Al2O3), a small amount of a metastable crystalized Al2.427O3.64 phase was found in their structure. A comparison was made of the wear resistance and friction coefficients of the synthesized PEO layers during friction tests in pairs with other PEO layers, a galvanic chromium coating, cast iron, steels and bronze of the BrC30 type. The results of the friction tests for the various PEO layers on aluminum alloys in tribo-contact with high-hardness elements made of hardened or chrome-plated steel justify the possibility of their use in a friction pair. We experimentally showed the influence of glycerin additive in motor oil 15W30 on the change in the friction coefficient of the PEO layers synthesized on the aluminum alloys and on the arc-sprayed coatings on their surfaces in tribocouples with hardened steel.

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Methods of crystallography: powder X-ray diffraction

Cited by 5 publications

References 0 publications

Effect of red mud added to zeolite LTA synthesis: Where is Fe in the newly-formed material?

Effect of red mud added to zeolite LTA synthesis: Where is Fe in the newly-formed material?

The dark colour of the Ploutonion at Hierapolis of Phrygiae (Turkey)

The Tribological Properties of Plasma Electrolytic Oxidation Layers Synthesized on Arc Spray Coatings on Aluminum Alloys in Contact with Various Friction Materials

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