The effect of powders homogenisation conditions on the synthesis of yttrium aluminium garnet (YAG) by a solid-state reaction |
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| Affiliation: | 1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. National Inorganic Mass Spectroscopy Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;3. STC “Institute for Single Crystals”, NAS of Ukraine, 60 Lenin Ave., 61001 Kharkov, Ukraine;4. Institute of Electrophysics, Ural Branch of Russian Academy of Sciences, 106 Amundsena Street, Ekaterinburg 620016, Russia;1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, PR China;2. Shanghai Research Institute of Criminal Science and Technology, Shanghai Key Laboratory of Crime Scene Evidence, Shanghai 200083, PR China;3. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, PR China;1. School of Materials Science and Engineering, State Key Laboratory For Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, PR China;2. Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, PR China;3. Institute of Computer Application, China Academy of Engineering Physics, Mianyang 621900, PR China;1. Key Laboratory of Transparent and Opto-Functional Advanced Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China;2. School of Material Sciences and Engineering, Shanghai University, 99 Shangda Road, Shanghai 200436, China;3. Institute of Electrophysics, Ural Branch of Russian Academy of Sciences, 106 Amundsen Street, Ekaterinburg 620016, Russia;4. Ural Federal University, 19 Mira Avenue, Ekaterinburg 620002, Russia;5. Department of Excited State Spectroscopy, Institute of Low Temperature and Structure Research Polish Academy of Sciences, 50-422 Wroclaw, Poland |
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| Abstract: | The work presents results of research on the influence of the state of homogenisation of reagent powders i.e. aluminium oxide and yttrium oxide on the synthesis of yttrium aluminium garnet. Fine powders of commercial aluminium oxide and yttrium oxide were mixed in the same manner in a laboratory ball mill but under four different conditions. Three batches of powders were prepared in water of various pH values, selected on the basis of the zeta potential measurements, and one batch was prepared in propanol. They were consolidated by filter pressing and then sintered in air at a temperature from 900 °C to 1700 °C for 1 h, with heating rate of 5 °C/min. Samples were subjected to dilatometric studies, phase composition determination, measurement of apparent density and pore size distribution, as well as a microscopic examination. Mixing environment affected, to a given extent, almost all the features of green, and partially sintered materials as well as course changes of linear dimensions. As a result, the relative densities of samples sintered at a maximum temperature ranged from 58.31% to 98.25%. The highest density was achieved for the material originating from the suspension having a pH of 9.5, in which heterocoagulation occurred. |
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| Keywords: | Mixing (A) Powders: solid-state reaction (A) Suspensions (A) Yttrium aluminium garnet |
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