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Journal articles on the topic 'Hexa-aluminate'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Ravichandran, D., R. Roy, W. B. White, and S. Erdei. "Synthesis and characterization of sol-gel derived hexa-aluminate phosphors." Journal of Materials Research 12, no. 3 (March 1997): 819–24. http://dx.doi.org/10.1557/jmr.1997.0119.

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Two refractory phosphors, BaMg2Al16O27: Eu2+ (BAM) and MgAl11O17.5: Ce3+, Tb3+ (MAO), have been synthesized both by the conventional solid-state processing route (using oxides as the starting materials) and by reacting precursors made by the sol-gel process using organic precursors. The phases formed were reacted at 1000 °C in (a) steam and (b) steam + AlF3. The phosphors were well crystallized with particle sizes in the range of 1–10 μm. The emission spectra showed the characteristic broad band blue emission of Eu2+ for BAM and a narrow band green luminescence of Tb3+ for MAO. The melting points of BAM and MAO were measured to be 1920 ± 20 °C and 1950 ± 20 °C, respectively, using an Ir-strip furnace and optical pyrometer. BAM and MAO phosphor materials are congruently and incongruently melting, respectively. Excellent crystallization via the sol-gel route was found even at 1220 °C. Enhancement of the luminescent output by the steam treatment by some 25% was determined.

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12

Lupei, A., V. Lupei, C. Gheorghe, L. Gheorghe, D. Vivien, G. Aka, and E. Antic-Fidancev. "Disorder effects in Nd3+-doped strontium hexa-aluminate laser crystals." Journal of Physics: Condensed Matter 18, no. 2 (December 14, 2005): 597–611. http://dx.doi.org/10.1088/0953-8984/18/2/017.

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13

Yamaguchi, S. "Ionic conduction in Sr hexa-aluminate with β-alumina structure." Solid State Ionics 26, no. 3 (April 1988): 183–88. http://dx.doi.org/10.1016/0167-2738(88)90225-1.

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14

KUMAR, DINESH, SAMPADA GURAV, VIKRAM JAYARAM, and SANJAY KUMAR BISWAS. "Synthesis and characterization of nickel/barium hexa-aluminate composite coatings." Bulletin of Materials Science 35, no. 6 (November 2012): 977–88. http://dx.doi.org/10.1007/s12034-012-0386-3.

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15

Gheorghe, C., L. Gheorghe, A. Achim, S. Hau, R. D. Avram, and G. Stanciu. "Optical properties of Sm3+ doped strontium hexa-aluminate single crystals." Journal of Alloys and Compounds 622 (February 2015): 296–302. http://dx.doi.org/10.1016/j.jallcom.2014.10.033.

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16

Vaidya, K. J., C. Y. Yang, M. DeGraef, and F. F. Lange. "Heteroepitaxy of rare-earth hexa-aluminates on sapphire." Journal of Materials Research 9, no. 2 (February 1994): 410–19. http://dx.doi.org/10.1557/jmr.1994.0410.

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We have grown epitaxial thin films of rare-earth hexa-aluminates on basal plane sapphire from liquid precursors. LnAl11O18 (Ln = Gd3+, Nd3+) films form via the reaction of a perovskite intermediate phase and the sapphire substrate according to LnAlO3 + 5Al2O3 = LnAl11O18. Hexa-aluminate thin films with magnetoplumbite (MP) structure grow epitaxially with (0001)mp ‖(0001)s, 〈1120mp‖〈1010〉s orientation relationship. The a-axis of the film is rotated 30°with respect to the substrate. This rotation results in a smaller mismatch (∼1%) between the two oxygen sublattices. Thermodynamic and kinetic arguments pertaining to magnetoplumbite formation for the smaller Gd3+ cation are presented. These epitaxial thin films are likely to have application in higher temperature ion conduction, catalysis, fluorescence, and as laser host.

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17

Manaa, H. "Nonlinear optical properties of Cr3+-doped lanthanum-magnesium hexa-aluminate LaMgAl11O19." Laser Physics Letters 2, no. 7 (July 1, 2005): 362–65. http://dx.doi.org/10.1002/lapl.200510005.

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18

Liu, Xueyin, Dexin Yang, Zhaohui Huang, Shuai Yi, Hao Ding, Minghao Fang, Shaowei Zhang, and Yan-gai Liu. "Novel Synthesis Method and Characterization of Porous Calcium Hexa-Aluminate Ceramics." Journal of the American Ceramic Society 97, no. 9 (July 24, 2014): 2702–4. http://dx.doi.org/10.1111/jace.13141.

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19

Aka, Gerard, Jeanine Thery, and Daniel Vivien. "Low-Temperature Synthesis and Characterization of Mixed Sodium Cerium(III) Hexa-Aluminate." Journal of the American Ceramic Society 70, no. 8 (August 1987): C—179—C—181. http://dx.doi.org/10.1111/j.1151-2916.1987.tb05718.x.

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20

Zhang, Xiaoyan, Jinrong Zhang, Yaohang Gu, Rongrong Li, Ying Li, Min Zhang, and Xiwei Qi. "High transparency of SiO2 combined Eu3+ doped lanthanum hexa-aluminate luminescence glasses." Optical Materials 89 (March 2019): 543–48. http://dx.doi.org/10.1016/j.optmat.2019.01.062.

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21

Agnesi, A., G. Gabetta, and G. C. Reali. "Measurement of the third‐order electronic susceptibility of lanthanum‐neodymium hexa‐aluminate crystals." Journal of Applied Physics 71, no. 12 (June 15, 1992): 6207–9. http://dx.doi.org/10.1063/1.350435.

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22

Yu, Ruijin, Hongjuan Li, Hailong Ma, Caifeng Wang, and Huan Wang. "Luminescence centers and spectrum characteristics of a novel Eu2+-activated hexa-aluminate CaZrBAl9O18." physica status solidi (a) 211, no. 4 (December 27, 2013): 811–16. http://dx.doi.org/10.1002/pssa.201330321.

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23

Gaillard, F., P. Artizzu, Y. Brullé, and M. Primet. "Catalytic combustion of methane: surface characterization of manganese-substituted barium hexa-aluminate catalysts." Surface and Interface Analysis 26, no. 5 (May 1, 1998): 367–73. http://dx.doi.org/10.1002/(sici)1096-9918(19980501)26:5<367::aid-sia381>3.0.co;2-p.

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24

Peicong, Pan, Ma Xiaoshan, and Hu Zhiwei. "Formation and elimination of red inclusions in Cr3+-doped beryllium hexa-aluminate (BHA) crystals." Materials Letters 12, no. 3 (October 1991): 195–98. http://dx.doi.org/10.1016/0167-577x(91)90173-4.

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25

Aminoff, C. G., C. Larat, M. Leduc, B. Viana, and D. Vivien. "Characterization and laser properties of lanthanum magnesium hexa-aluminate activated by neodymium and chromium." Journal of Luminescence 50, no. 1 (May 1991): 21–29. http://dx.doi.org/10.1016/0022-2313(91)90006-h.

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26

Yellapragada, Naga Venkata Sai Ram, Tara Sasanka Cherukuri, Prabakaran Jayaraman, and Sameer Kumar Devarakonda. "Estimation of Lattice Strain in Lanthanum Hexa Aluminate Nanoparticles Using X-Ray Peak Profile Analysis." Revue des composites et des matériaux avancés 31, no. 1 (February 28, 2021): 13–19. http://dx.doi.org/10.18280/rcma.310102.

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This work confers to the preparation of Lanthanum Hexa Aluminate (LHA) nanoparticles by chemical precipitation and filtration technique followed by characterization studies conducted through X-ray peak profile analysis (XPPA) and Field Emission Scanning Electron Microscopy (FESEM) supported by Energy Dispersive Spectroscopy (EDS). From the X-ray diffraction (XRD) analysis, it has been observed that the prepared powder has hexagonal crystal structure. Further, Scherrer Method (S-M), modified Williamson–Hall (W-H), and Size–Strain Plot (SSP) methods have been implemented to all LHA reflection peaks for the comprehensive crystalline analysis. The influence of crystallite size, stress, strain, and energy density values on the peak broadening of LHA nanoparticles has been critically examined and discussed in the current work. In addition to regular mathematical models this paper also provides an insight into the calculation of Youngs modulus without tedious experimental procedure. The predicted crystallite size estimated from Scherrer’s formula, and W-H models are correlated to scanning electron microscopy results and observed that the average grain size of LHA nano particles estimated from SEM analysis, and models have less deviation in the present study.

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27

Angelescu, Nicolae, Cristina Stancu, Sofiane Amziane, Vasile Bratu, and Elena Valentina Stoian. "Study on Hydration and Strengthening of High Alumina Cements." Scientific Bulletin of Valahia University - Materials and Mechanics 15, no. 12 (April 25, 2017): 22–27. http://dx.doi.org/10.1515/bsmm-2017-0004.

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Abstract Refractory concretes based on aluminous cements are used with great success in areas where high temperatures are required. The mineralogical composition of the high alumina cement is the main factor which gives the physical and mechanical properties at high temperatures of refractory monolithic materials.It is therefore desirable to use high alumina cements based on mineralogical compounds with high refractoriness, because in the end those beneficial properties can be found in the final product - refractory concrete.The aim of this paper is to design, realize and characterize different compositions of high alumina cements based on mineralogical compounds with the highest refractory from the CaO-Al2O3 binary system (i.e. CA, CA2, and CA6), and to find ways of hydraulic activation of calcium hexa aluminate, also.

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28

Singh, Vijay, T. K. Gundu Rao, and Jun-Jie Zhu. "Preparation, luminescence and defect studies of Eu2+-activated strontium hexa-aluminate phosphor prepared via combustion method." Journal of Solid State Chemistry 179, no. 8 (August 2006): 2589–94. http://dx.doi.org/10.1016/j.jssc.2006.04.053.

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29

Jovanić, B. R., and B. Viana. "High-pressure and optical properties of lanthanum magnesium hexa-aluminate doped with Mn2+ (LMA:Mn2+) laser material." Optics Communications 282, no. 9 (May 2009): 1798–800. http://dx.doi.org/10.1016/j.optcom.2009.01.034.

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30

Liu, Xueyin, Dexin Yang, Zhaohui Huang, Jianke Ye, Shaowei Zhang, Minghao Fang, Hao Ding, and Yan-gai Liu. "In-situ synthesis of porous calcium hexa-aluminate ceramics and growth mechanism of the plate-like grains." Ceramics International 41, no. 10 (December 2015): 14727–32. http://dx.doi.org/10.1016/j.ceramint.2015.07.197.

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31

Mishra, D., S. Anand, R. K. Panda, and R. P. Das. "Preparation of barium hexa-aluminate through a hydrothermal precipitation–calcination route and characterization of intermediate and final products." Materials Letters 56, no. 6 (November 2002): 873–79. http://dx.doi.org/10.1016/s0167-577x(02)00630-4.

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32

Liu, Xueyin, Yan-gai Liu, Zhaohui Huang, and Minghao Fang. "Preparation of High-Quality Porous Calcium Hexa-Aluminate Ceramics using Salt as Both Reaction Medium and Pore-Former." Interceram - International Ceramic Review 67, S1 (May 30, 2018): 50–57. http://dx.doi.org/10.1007/s42411-018-0045-9.

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33

Chaware, Priti, Amol Nande, S. J. Dhoble, and K. G. Rewatkar. "Structural, photoluminescence and Judd-Ofelt analysis of red-emitting Eu3+ doped strontium hexa-aluminate nanophosphors for lighting application." Optical Materials 121 (November 2021): 111542. http://dx.doi.org/10.1016/j.optmat.2021.111542.

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34

Bohre, Ashish, Uroš Novak, Miha Grilc, and Blaž Likozar. "Synthesis of bio-based methacrylic acid from biomass-derived itaconic acid over barium hexa-aluminate catalyst by selective decarboxylation reaction." Molecular Catalysis 476 (October 2019): 110520. http://dx.doi.org/10.1016/j.mcat.2019.110520.

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35

Park, Jae-Gwan, and A. N. Cormack. "Structural Chemistry of Alkaline Earth Hexa-Aluminates." MRS Proceedings 369 (1994). http://dx.doi.org/10.1557/proc-369-457.

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AbstractComputer-based atomistic simulation techniques have been used to investigate the crystal chemistry and phase relationships in alkaline earth hexa-aluminates. The lattice energies for hexa-aluminate-related structural models are calculated and successfully predict that barium prefers the β-alumina-type structures with charge-balancing defects, whilst calcium or strontium prefers the ideal magnetoplumbite structure. In the case of magnesium, it is predicted that it does not prefer a hexa-aluminate structure.

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36

Sai Ram, Y. N. V., C. Tarasasanka, and J. Prabakaran. "Preparation and characterization of lanthanum hexa aluminate powders for high temperature applications." Materials Today: Proceedings, June 2020. http://dx.doi.org/10.1016/j.matpr.2020.05.368.

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37

Li, Maoyin, Bart Van Meerbeek, Bensu Tunca, Stevan Cokic, Jef Vleugels, and Fei Zhang. "Alumina toughened zirconia reinforced with equiaxed and elongated lanthanum hexa-aluminate precipitates." Journal of the European Ceramic Society, September 2021. http://dx.doi.org/10.1016/j.jeurceramsoc.2021.09.038.

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38

Wessler, B., A. Steinecker, and W. Mader. "Characterization of the Interface Between Lanthanum Hexa-Aluminate and Sapphire by Exit Wave Reconstruction." MRS Proceedings 589 (1999). http://dx.doi.org/10.1557/proc-589-335.

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AbstractEpitaxial thin films of rare-earth hexaaluminates on basal plane sapphire have been produced by chemical solution deposition. LaAl11O18 films with magnetoplumbite structure grow with (0001)HA||(0001)S and [1100]HA||[2110]s orientation relationshipTo investigate the stucture of the interface exit wave reconstruction of focus series was carried out using a field emission TEM. Due to the inversion of the imaging process major artefacts at the interface can be eliminated. Exit waves were simulated based on different interface models and were compared with the reconstructed waves to localize the positions of the atoms at the interface. Two different types of interfaces were observed in the samples. One of the types, in which the spinel block of hexaaluminate faces the sapphire with the mixed cation layer with occupied octahedra and tetrahedra, is characterized in detail. Face-sharing of coordination polyhedra is avoided to large extent

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39

AKA, G., J. THERY, and D. VIVIEN. "ChemInform Abstract: Low-Temperature Synthesis and Characterization of Mixed Sodium Cerium(III) Hexa-Aluminate." ChemInform 18, no. 43 (October 27, 1987). http://dx.doi.org/10.1002/chin.198743034.

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