Relevant bibliographies by topics / Al-Si spinel phase

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  2. Dissertations / Theses
  3. Book chapters

Academic literature on the topic 'Al-Si spinel phase'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Al-Si spinel phase"

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Wang, Yong, and William J. Thomson. "Mullite formation from nonstoichiometric slow hydrolyzed single phase gels." Journal of Materials Research 10, no. 4 (April 1995): 912–17. http://dx.doi.org/10.1557/jmr.1995.0912.

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A comparative dynamic x-ray diffraction (DXRD) and differential thermal analysis (DTA) study was performed in the investigation of mullite and spinel formation from slowly hydrolyzed single phase gels with Al/Si ratios ranging from 1/1 to 14/1. Both metastable tetragonal mullite and spinel were observed to form at temperatures <1000 °C in the gels with Al/Si ratios <8/1 and mullite transformed to the orthorhombic structure at ∼1250 °C. However, at higher Al/Si ratios, spinel was the only crystalline phase detected at <1000 °C and orthorhombic mullite formed directly at temperatures >1250 °C. As the Al/Si ratio increases, both the tetragonal mullite and spinel formation temperatures decrease while the orthorhombic mullite formation temperature increases. Based on the Al/Si composition where the formation extents of tetragonal mullite and spinel were maximum, their compositions are estimated to be 2Al2O3 · SiO2 and 6A12O3 · SiO2, respectively.
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Chakraborty, Akshoy kr, and Sukhen Das. "Al–Si spinel phase formation in diphasic mullite gels." Ceramics International 29, no. 1 (January 2003): 27–33. http://dx.doi.org/10.1016/s0272-8842(02)00084-6.

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Chakravorty, A. K. "Intermediate Si-Al spinel phase formation in phase transformation of diphasic mullite gel." Journal of Materials Science 28, no. 14 (January 1, 1993): 3839–44. http://dx.doi.org/10.1007/bf00353188.

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Ptáček, Petr, František Šoukal, Tomáš Opravil, Magdaléna Nosková, Jaromír Havlica, and Jiří Brandštetr. "The kinetics of Al–Si spinel phase crystallization from calcined kaolin." Journal of Solid State Chemistry 183, no. 11 (November 2010): 2565–69. http://dx.doi.org/10.1016/j.jssc.2010.08.030.

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Chakraborty, Akshoy Kr. "Reinvestigation of Al-Si Spinel Phase in Diphasic Al2O3-SiO2 Gel." Journal of the American Ceramic Society 88, no. 1 (December 29, 2004): 134–40. http://dx.doi.org/10.1111/j.1551-2916.2004.00018.x.

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Kurajica, Stanislav, Emilija Tkalčec, Vilko Mandić, Iva Lozić, and Jörg Schmauch. "Sol-Gel Derived Mullite-Gahnite Composite." Advances in Science and Technology 87 (October 2014): 126–31. http://dx.doi.org/10.4028/www.scientific.net/ast.87.126.

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Mullite-gahnite composites with different phase-proportions were prepared using sol-gel process. Crystallization path was determined using differential thermal analysis (DTA). X-ray powder diffraction (XRD) was used to study the crystal phases development. The course of the thermal reactions is dominated by the intermediate formation of two spinel phases. The former phase was attributed to gahnite, while the latter to Al-Si spinel. Zn loading decreases amounts of mullite and α-alumina, while increases gahnite and amorphous phase. The observed microstructure of sintered bodies is characterized by fine gahnite particles distributed among larger mullite grains, which is highly favourable for ceramics with high mechanical requirements.
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Sagan, P., M. Frugynskyi, R. Mroczka, and G. Wisz. "Properties of multicomponent (Mn-Ni-Co-Al-Si-Ti) oxide spinel hierarchically organized nanostructures deposited by magnetron sputtering in two temperatures." Physics and Chemistry of Solid State 22, no. 3 (September 7, 2021): 494–500. http://dx.doi.org/10.15330/pcss.22.3.494-500.

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Multicomponent spinel films were deposited on Ag/Si substrates by magnetron sputtering. Two substrate temperatures were used. XRD diffraction measurements show that the layers are composed of three metals oxides (Mn2O3, NiO, CoO). The presence of spinel phase is poorly visible. However, electron diffraction measurements (RHEED) clearly confirmed the presence of nanostructured spinel structure on top of the samples. Moreover, AFM measurements show that nanostructured spinel islands are present on the sample surface. The measurements validated that indeed, hierarchically organized spinel-oxides nanostructures were obtained. A possible model growth of the spinel nanostructures at different temperatures is discussed.
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Yokoyama, Takushi, Keisuki Nishu, Shunsuke Torii, Yoshio Ikeda, and Tokuko Watanabe. "Mullite Precursor Part I. Characterization of Mullite Precursor Formed by a Reaction of Monosilicic Acid on Aluminum Hydroxide." Journal of Materials Research 12, no. 8 (August 1997): 2111–16. http://dx.doi.org/10.1557/jmr.1997.0283.

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By adsorption of monosilicic acid on aluminum hydroxide, an amorphous aluminosilicate (AAS) of Si/Al ratio of 1/3 was formed. When the AAS was heated to 1000 °C, mullite (3Al2O3 · 2SiO2) crystallized directly without the formation of a spinel phase. It was clearly evidenced that correct adjustment of three factors, the Si/Al ratio, the proportion of 4- and 6-coordinated aluminums, and the single environment of a unit (no Si–O–Si bond), is important for the direct mullitization from AAS.
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Bosenick, A., M. T. Dove, E. R. Myers, E. J. Palin, C. I. Sainz-Diaz, B. S. Guiton, M. C. Warren, M. S. Craig, and S. A. T. Redfern. "Computational methods for the study of energies of cation distributions: applications to cation-ordering phase transitions and solid solutions." Mineralogical Magazine 65, no. 2 (April 2001): 193–219. http://dx.doi.org/10.1180/002646101550226.

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AbstractThe structural and thermodynamic properties of minerals are strongly affected by cation site-ordering processes. We describe methods to determine the main interatomic interactions that drive the ordering process, which are based on parameterizing model Hamiltonians using empirical interatomic potentials and/or ab initio quantum mechanics methods. The methods are illustrated by a number of case study examples, including Al/Si ordering in aluminosilicates, Mg/Ca ordering in garnets, simultaneous Al/Si and Mg/Al ordering in pyroxenes, micas and amphiboles, and Mg/Al non-convergent ordering in spinel using only quantum mechanical methods.
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Zhu, Chun Xiao, and Shao Feng Zhu. "Preparation of Al2O3-SiO2 Composite Powder by Sol–Gel Method." Advanced Materials Research 1053 (October 2014): 173–76. http://dx.doi.org/10.4028/www.scientific.net/amr.1053.173.

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Al2O3-SiO2 composite powder was prepared by sol-gel method, using TEOS and AlNO3 as the main raw material .XRD, SEM and the specific surface analyzer were used to characterize the powder. The results showed that powder obtained by calcining xerogel of the molar ratio of SiO2/Al2O3=1:1.5 at 1200°C had high crystallinity and purity , homogeneous distribution and small particle size that was 100-200nm. Its specific surface area decreased with the increase of the calcining temperature. The main phase of xerogel was amorphous silica. After xerogel was calcined at 400°C, 600°C and 800°C respectively, the phase of obtained powder was also amorphous silica. But at 1000°C and 1100°C respectively, small amounts of Al-Si spinel were produced. At 1200°C, the powder was all mullite and Al-Si spinel did not exist completely.
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Dissertations / Theses on the topic "Al-Si spinel phase"

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Křečková, Magdaléna. "Kinetika heterogenních procesů v technologii silikátů - dehydroxylace a rozpouštění jílových minerálů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2012. http://www.nusl.cz/ntk/nusl-233360.

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The first part of the thesis discuss general characterization of heterogeneous processes in silicates. This part is focused on kinetics of heterogeneous processes and mathematical description of reactions time behavior. The other part describes important technologies in silicate industry such as sintering, solid matter decomposition, transition modification, etc. Another chapter deals mineralogy, structure and properties of eminent silicate raw materials. Emphases is given to characterization of clay minerals and their utilising. The experimental part handle the analytic techniques used for investigation of thermal decompostion, dehydroxylation, crystalization of Al-Si spinel phase and sintering process of washed kaolin Sedlec Ia from the region Carlsbad (Czech Republic). Concluding chapter reports on results of experimental work.
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Book chapters on the topic "Al-Si spinel phase"

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Chakraborty, Akshoy Kumar. "Topotaxy IN K-MK-AL/SI Spinel-Mullite Reaction Series." In Phase Transformation of Kaolinite Clay, 303–11. New Delhi: Springer India, 2013. http://dx.doi.org/10.1007/978-81-322-1154-9_24.

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