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dc.contributor.authorLo, JRen_US
dc.contributor.authorTseng, TYen_US
dc.date.accessioned2019-04-02T05:59:26Z-
dc.date.available2019-04-02T05:59:26Z-
dc.date.issued1998-09-30en_US
dc.identifier.issn0254-0584en_US
dc.identifier.urihttp://dx.doi.org/10.1016/S0254-0584(98)00139-4en_US
dc.identifier.urihttp://hdl.handle.net/11536/150237-
dc.description.abstractThe phase development of Y3Al5O12 (YAG), YAlO3 (YAP), and Y4Al2O9 (YAM) synthesized by a modified sol-gel method has been studied. A chelate agent (ethyl acetoacetate) is added to control the hydrolysis and to modify the sol-gel process. The sol-gel-derived powder is then heat-treated to induce crystallization. The X-ray diffraction method is employed to determine the crystalline phases of the resulting powders. The formation of YAG, YAP, and YAM is described. For both YAP and YAM compositions, there is a phase transformation from YAP polymorphism to perovskite YAP. The activation energies of YAG are estimated at about 69 kcal/mol by the isothermal process as fitted with the Johnson-Mehl-Avrami equation and about 222 +/- 2 kcal/mol by the continuous heating method as fitted with Kissinger and Sotgiu plots. The difference of activation energies calculated from the two methods is mainly due to the complicated crystallization of YAG. (C) 1998 Elsevier Science S.A. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectphase developmenten_US
dc.subjectsol-gel processen_US
dc.subjectyttria-alumina systemen_US
dc.titlePhase development and activation energy of the Y2O3-Al2O3 system by a modified sol-gel processen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/S0254-0584(98)00139-4en_US
dc.identifier.journalMATERIALS CHEMISTRY AND PHYSICSen_US
dc.citation.volume56en_US
dc.citation.spage56en_US
dc.citation.epage62en_US
dc.contributor.department電子工程學系及電子研究所zh_TW
dc.contributor.departmentDepartment of Electronics Engineering and Institute of Electronicsen_US
dc.identifier.wosnumberWOS:000075811800008en_US
dc.citation.woscount29en_US
Appears in Collections:Articles