Defect structure of alumina-rich nonstoichiometric magnesium aluminate spinel |
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| Institution: | 1. Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan;2. Department of Environment and Materials Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan;1. Ural Federal University, Yekaterinburg, Mira St. 21, Russia;2. Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Amundsen St. 106, Russia;1. Materials Science and Technology Research Institute (INTEMA), Ceramics Division, Av. Juan B. Justo 4302, (7600) Mar del Plata, Argentina;2. Federal University of São Carlos, Materials Engineering Department, Rod. Washington Luiz, km 235, São Carlos, SP, C.P. 676, CEP 13565-905, Brazil;3. Saint-Gobain, Av. Independência, 7031, Vinhedo, SP, Brazil;1. Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, Iran;2. Department of Materials Science and Engineering, Malek Ashtar University of Technology, Isfahan, Iran;1. School of Physical Science and Technology, Southwest Jiaotong University, Key Laboratory of Advanced Technology of Materials, (Ministry of Education), Chengdu, 610031, China;2. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, China;1. Chemistry Department, Faculty of Science, Minia University, El-Minia 61519, Egypt;2. Chemistry and Environmental Division, Manchester Metropolitan University, Manchester M1 5GD, England, United Kingdom;3. Department of Chemistry, Tulane University, New Orleans, LA 70118, USA;4. Department of Physics, Faculty of Sciences, Erciyes University, 38039 Kayseri, Turkey;5. Department of Medicinal Chemistry, Faculty of Pharmacy, El-Minia University, 61519 El-Minia, Egypt |
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| Abstract: | In order to clarify the relation between the dissolution mechanism of hydrogen and the defect structure in alumina-rich nonstoichiometric magnesium aluminate spinels, several compositions of single crystals were grown by the flame fusion method and their compositional dependence of the solubility of hydrogen and that of the mass density were studied by the IR absorption and Archimedes methods, respectively. The solubility of hydrogen increased in proportion to the square root of the water partial pressure and with the increase in the excess amount of alumina. The densities of the single crystals were slightly less than the value calculated based on the reported defect structure. The compositional dependence of the solubility of hydrogen and that of the density can be explained by the model in which the concentration of the oxide ion vacancy increases with the alumina content due to the decrease in the capability of the Mg site to accept the excess Al ion. |
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