Rietveld refinement of amorphous SiO2 prepared via sol–gel method
Materials Letters, 2006 Abstract Using the Rietveld refinement, we analyze the structural evolution under thermal treatment of silica xerogel samples prepared by the sol–gel method with molar ratio ( R ) of water to TEOS of R = 5 and R = 11.66. We refine the structure of compounds using the Maud program and we found the unit cell parameters and atomic positions of the
Martinez, J. +4 more
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Metals, 2014 TiB2-Cu cermets with various volume fractions of copper (from 3 to 30 vol. %) were produced via liquid phase sintering at the temperature range 1100–1200 °C in vacuum using spark plasma sintering (SPS) technique.
Marta Ziemnicka-Sylwester
doaj +1 more source
Synthesis, Structure, and Luminescent Properties of the New Double Borate K3Eu3B4O12
Конденсированные среды и межфазные границы, 2020 The study established the formation of the new double borate K3Eu3B4O12. The Rietveld refi nement of the crystal structure revealed that K3Eu3B4O12 crystallises in the monoclinic syngony with unit cell parameters a = 10.6727(7) Å, b = 8.9086(6) Å, c = 13.
Evgeniy V. Kovtunets +2 more
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Rietveld Quantitative Phase Analysis of Oil Well Cement: in Situ Hydration Study at 150 Bars and 150 °C [PDF]
, 2019 Oil and gas well cements are multimineral materials that hydrate under high pressure and temperature. Their overall reactivity at early ages is studied by a number of techniques including through the use of the consistometer.
Cuesta-Garcia, Ana Maria +5 more
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Trimerization of NaC2N3 to Na3C6N9 in the Solid [PDF]
, 2000 Sodium dicyanamide NaC2N3 was found to undergo two phase transitions. According to thermal analysis and temperature-dependent X-ray powder diffractometry, the transition of α-NaC2N3 (1a) to β-NaC2N3 (1b) occurs at 33°C and is displacive.
Irran, Elisabeth +3 more
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Co-crystal structures of furosemide:urea and carbamazepine:indomethacin determined from powder x-ray diffraction data [PDF]
, 2020 Co-crystallization is a promising approach to improving both the solubility and the dissolution rate of active pharmaceutical ingredients. Crystal structure determination from powder diffraction data plays an important role in determining co-crystal ...
Al Rahal, Okba +4 more
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Green Synthesis of Nanocomposite of Ag/Ag2O Using Coelomic Liquid: Optical Absorption Analysis [PDF]
Nanochemistry ResearchIn this research, silver and silver oxide (Ag/Ag2O) nanocomposites were synthesized using a green method at different concentrations of silver nitrate.
Esmaeil Shahriari +2 more
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Determination of metallization degree of pre-reduced chromite with image and rietveld analysis [PDF]
Journal of Mining and Metallurgy. Section B: Metallurgy, 2020 Metallization degree of pre-reduced chromite was determined using two methods. The chromite samples were reduced in the solid state by methane-hydrogen gas mixtures.
Leino T., Taskinen P., Eric R.H.
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Rietveld Method Applied for Triacylglycerol Polymorphism Analysis [PDF]
Acta Crystallographica Section A Foundations and Advances, 2014 The characterization of the fat components becomes very useful in the formulation of shortening, margarines and fatty products due to their unique properties of plasticity, texture, solubility and aeration. The qualitative analysis obtained by X-ray diffraction (XRD) can be further improved in order to fulfill the lack of information on the ...
Guilherme Calligaris +3 more
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Structural studies of mesoporous ZrO$_{2}$-CeO$_{2}$ and ZrO$_{2}$-CeO$_{2}$/SiO$_{2}$ mixed oxides for catalytical applications [PDF]
, 2016 In this work the synthesis of ZrO$_{2}$-CeO$_{2}$ and ZrO$_{2}$-CeO$_{2}$/SiO$_{2}$ were developed, based on the process to form ordered mesoporous materials such as SBA-15 silica.
Bacani, R. +3 more
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