Relevant bibliographies by topics / Hexa-aluminate

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Academic literature on the topic 'Hexa-aluminate'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Hexa-aluminate"

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Mizushima, Yasuyuki, and Makoto Hori. "Preparation of barium hexa-aluminate aerogel." Journal of Materials Research 9, no. 9 (September 1994): 2272–76. http://dx.doi.org/10.1557/jmr.1994.2272.

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Barium hexa-aluminate (BaO · 6Al2O3) aerogels were prepared using a supercritical drying method and their properties examined. A barium hexa-aluminate aerogel prepared from a double alkoxide of barium and aluminum showed a high specific surface area of 421 m2/g. Monolithic barium hexa-aluminate formed. No BaO · Al2O3 or alumina was observed, as is often the case in powder processing. The specific surface area of the monolithic barium hexa-aluminate fired at 1400 °C for 2 h was 12 m2/g, while that of the barium hexa-aluminate xerogel was only 0.8 m2/g. A barium hexa-aluminate aerogel was also prepared using barium by using a chelating agent. This aerogel showed a specific surface area of 454 m2/g as-dried. In the case of the chelating agent, BaO · Al2O3 was also detected along with barium hexa-aluminate after firing.
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Loison, Lise, Mouna Sassi, Thorsten Tonnesen, Emmanuel De Bilbao, Rainer Telle, and Jacques Poirier. "Differences in the Corrosive Spalling Behavior of Alumina-Rich Castables: Microstructural and Crystallographic Considerations of Alumina and Calcium Aluminate Matrices." Ceramics 3, no. 2 (May 11, 2020): 223–34. http://dx.doi.org/10.3390/ceramics3020020.

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The energy transition from the incineration and gasification of fossil fuels to the incineration and gasification of biomass refractory linings is being held up by a severe corrosion issue, caused by high alkali contents and the wide variety of biomass sources. Incinerators optimized for fossil fuels are commonly lined with mullite, Al2O3-Cr or SiC-based refractory products; however, those materials are not always suitable for the use of organic fuels. Hibonite (CaO·6Al2O3)-based refractory products have shown promising performance because of their high resistance against alkali attacks. Indeed, previous works have shown that the reaction between calcium hexa-aluminate and an alkali does not lead to the strong volume expansion observed with other mineral phases, such as corundum or andalusite. The present work aims to describe the reactions kinetics occurring between hibonite-based raw materials and biomass ashes. Therefore, the three main oxides contained in an average biomass, namely, CaO, SiO2 and K2O, were selected to examine the high temperature reactions with a calcium hexa-aluminate matrix. The resulting phase composition and microstructure were compared with the performance of an alumina matrix through, respectively, X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). The post-mortem observations show a higher extent of reaction for the alumina than for the calcium hexa-aluminate. Moreover, the microstructure of the alumina matrix suffered a strong chemical spalling, while the calcium hexa-aluminate microstructure remained undamaged after the corrosion.
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Singh, Vipin Kant, and Krishna Kumar Sharma. "Low-Temperature Synthesis of Calcium Hexa-Aluminate." Journal of the American Ceramic Society 85, no. 4 (December 20, 2004): 769–72. http://dx.doi.org/10.1111/j.1151-2916.2002.tb00170.x.

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Park, Jae-Gwan, and A. N. Cormack. "Defect structures and nonstoichiometry in lanthanum hexa-aluminate." Journal of the European Ceramic Society 19, no. 13-14 (October 1999): 2249–56. http://dx.doi.org/10.1016/s0955-2219(99)00123-5.

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Rao, R. R., and L. Mariappan. "Combustion synthesis and characterisation of lanthanum hexa-aluminate." Advances in Applied Ceramics 104, no. 5 (October 2005): 268–71. http://dx.doi.org/10.1179/174367605x62427.

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Debsikdar, J. C., and O. S. Sowemimo. "Some characteristics of barium hexa-aluminate/celsian composites." Journal of Materials Science Letters 11, no. 10 (1992): 637–38. http://dx.doi.org/10.1007/bf00728889.

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Chaurasia, Himanshi, Santosh K. Tripathi, Kamlesh Bilgaiyan, Akhilesh Pandey, K. Mukhopadhyay, Kavita Agarwal, and N. Eswara Prasad. "Preparation and properties of AlN (aluminum nitride) powder/thin films by single source precursor." New Journal of Chemistry 43, no. 4 (2019): 1900–1909. http://dx.doi.org/10.1039/c8nj04594a.

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The precursor hexa urea aluminate(iii) was pyrolysed at various temperature (800 °C to 1000 °C) and pressure (100 Torr to 1 Torr) under inert atmosphere to study the effect of temperature, pressure and inert gases for the conversion of precursor to AlN material/thin films.
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Davies, T. J., H. G. Emblem, and W. A. Al-Douri. "Preparation of barium hexa-aluminate ceramic fibres and refractories." British Ceramic Transactions 99, no. 2 (February 2000): 85–87. http://dx.doi.org/10.1179/bct.2000.99.2.85.

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Debsikdar, J. C. "Synthesis and characterization of gel-derived barium hexa-aluminate." Journal of Materials Science 24, no. 10 (October 1989): 3565–72. http://dx.doi.org/10.1007/bf02385741.

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SINGH, VIJAY, and JUN-JIE ZHU. "SYNTHESIS AND PHOTOLUMINESCENCE PROPERTIES OF Er3+, Eu3+ IONS ACTIVATED SrAl12O19." International Journal of Modern Physics B 20, no. 29 (November 20, 2006): 4891–98. http://dx.doi.org/10.1142/s0217979206035643.

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Synthesis of Er 3+, Eu 3+ ions activated strontium hexa-aluminate phosphor using the combustion method is described. An efficient phosphor can be prepared by this method at reaction temperatures as low as 500°C in a few minutes. Powder X-ray diffraction and the optical properties were studied by photoluminescence spectra.
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Dissertations / Theses on the topic "Hexa-aluminate"

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Higel, Pauline. "De la caractérisation de matrices cristallines hexa-aluminates et nickelates à la recherche de bistabilité optiques de terres rares." Paris 6, 2006. http://www.theses.fr/2006PA066180.

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La bistabilité optique intrinsèque (BOI) s’inscrit dans une problématique actuelle : la miniaturisation des composants pour le stockage de l’information. Deux matrices cristallines ont été étudiées : un hexa-aluminate dopé Nd3+ dans lequel le phénomène de BOI est attendu entre les ions Nd3+. Dans ce cadre, l’environnement des ions Nd3+ a été étudié par RPE, spectroscopie optique, EXAFS et DRX en fonction de la teneur introduite. La symétrie du site des ions Nd3+ est C3v (contre D3h attendue) et les interactions entre ions Nd3+ sont trop faibles pour obtenir une BOI. L’autre famille appartient aux nickelates Gd2(1-x)Er2xBaNiO5 dans lesquels la BOI est attendue entre les ions Er3+ et Ni2+, à la condition que le composé présente une réorientation de spin à basse température conduisant à un déplacement de raie optique. Il a été mis en évidence que l’anisotropie magnétique des ions Er3+ pouvait bloquer cette réorientation de spin.
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2

Sassi, Mouna. "Réactivité à haute température de l’hexa-aluminate de calcium au contact des cendres de biomasse." Thesis, Orléans, 2019. http://www.theses.fr/2019ORLE3101.

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La corrosion à haute température par les alcalins (sels ou oxydes de sodium et/ou de potassium à l'état solide, liquide et en état vapeur) et les oxydes liquides (laitiers) est un problème sérieux qui affecte la vie des matériaux réfractaires utilisés dans les installations d'incinération de déchets. Afin de contribuer à une meilleure connaissance de cette attaque, une étude en laboratoire a été réalisée pour étudier la corrosion alcaline de différentes matières premières : chamotte d’argile, andalousite, andalousite mullitisée, mullite, zircone mullite, bauxite, corindon blanc, alumine-β et comparé à l'hexa-aluminate de chaux. La réactivité de l'hexa-aluminate de chaux et de l'alumine avec les laitiers CaO-SiO2 et CaO-Al2O3 est étudiée pour évaluer leur résistance. La cinétique de réaction est déterminée à partir d'essais de corrosion ex situ par DRX après refroidissement, sur des grains de CA6/Al2O3 mélangés à des laitiers synthétisées et broyées dans des proportions variables. Pour les grains d'alumine et d'hexa-aluminate de chaux, la dissolution est rapide, suivie d'une lente précipitation d'un composé intermédiaire. Ceci est en accord avec les prévisions thermodynamiques. Par conséquent, l'hexa-aluminate de chaux présente à la fois une stabilité thermochimique élevée au contact des alcalins et une résistance élevée à la dissolution des oxydes liquides. Des essais industriels ont été réalisés dans un incinérateur de déchets dangereux situé à Houston, USA. Les résultats après une période d’essai de 7.5 mois montrent que le béton d’hexa-aluminate de chaux résiste bien
High-temperature corrosion by alkali (salts or oxides of sodium and/or potassium in solid, liquid, and vapor state) and slag is a serious problem that affects the service life of refractories used in incineration plants. In order to contribute to a better knowledge of this attack, a laboratory study was carried out during this research to study alkali corrosion of different raw materials: fireclay, andalusite, mullitized andalusite, mullite, fused zirconia mullite, bauxite, white corundum, β-alumina and compared to calcium hexa-aluminate.Moreover, the reactivity of calcium hexa-aluminate and alumina with CaO-SiO2 and CaO-Al2O3 slags is studied to evaluate their resistance. The reaction kinetics is determined from ex-situ corrosion tests by XRD after cooling, on CA6/Al2O3 grains mixed with slag synthesized and milled in varying proportions. For both alumina and calcium hexa-aluminate grains, the dissolution is fast, followed by a slow precipitation of an intermediate compound. This is in agreement with thermodynamic predictions.As a result, calcium hexa-aluminate shows both high thermochemical stability in contact with alkali and high dissolution resistance to liquid oxides. Industrial trials are underway in an American hazardous waste incinerator located in Houston. The results after a trial period of 7.5 months show that calcium hexaluminate castable is resistant
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Conference papers on the topic "Hexa-aluminate"

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Narita, Keiichi, Mari Uenishi, Masashi Taniguchi, Isao Tan, Hirohisa Tanaka, Kimiyoshi Kaneko, Noboru Sato, and Ken'Ichi Taki. "A Hexa-Aluminate Automotive Three-Way Catalyst." In SAE 2002 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2002. http://dx.doi.org/10.4271/2002-01-0736.

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Lupei, A., V. Lupei, C. Gheorghe, L. Gheorghe, D. Vivien, and G. Aka. "Cationic Distribution and Spectral Properties of Nd3+ in Hexa-aluminate Laser Crystals." In Advanced Solid-State Photonics. Washington, D.C.: OSA, 2005. http://dx.doi.org/10.1364/assp.2005.tub6.

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Lupei, A., V. Lupei, C. Gheorghe, L. Gheorghe, D. Vivien, and G. Aka. "Cationic Distribution and Spectral Properties of Nd3+ in Hexa-aluminate Laser Crystals." In Advanced Solid-State Photonics. Washington, D.C.: OSA, 2005. http://dx.doi.org/10.1364/assp.2005.52.

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Journal articles
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