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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Synthesis of a mixed-rare-earth aluminum garnet solid solution

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Author(s):
Santos, C. [1] ; Daguano, J. K. M. F. [1] ; Rodrigues, Jr., D. [1] ; Suzuki, P. A. [1, 2] ; Santos, F. A. [1] ; Silva, O. M. M. [3]
Total Authors: 6
Affiliation:
[1] USP EEL Polo Urboind, BR-12600970 Lorena, SP - Brazil
[2] LNLS, BR-13084971 Campinas, SP - Brazil
[3] CTA IAE AMR, BR-12228904 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Materials Letters; v. 91, p. 283-286, JAN 15 2013.
Web of Science Citations: 4
Abstract

In this work, the substitution of commercial Y2O3 by a rare earth mixed oxide, RE2O3, to form yttrium aluminum garnet (Y3Al5O12-YAG), was investigated. Al2O3:Y2O3 and Al2O3:RE2O3 powder mixtures were milled and pressed. Compacts were sintered at 1000, 1400 or 1600 degrees C, for 120 min. RE2O3 oxide was characterized by high-resolution X-ray diffraction (HRXRD) and compared to Y2O3. X-ray diffraction pattern of the RE2O3 indicates a true solid solution formation. Rietveld refinement of the sintered YAG and (RE)AG revealed a similar crystal structure. Microstructural analysis of both, YAG or (RE)AG, revealed similar grain sizes of about 2.5 mu m and mechanical properties, with hardness of 400 HV and fracture toughness of 3.8 MPam(1/2). It could be, thus, demonstrated that pure Y2O3 can be substituted by the rare-earth solid solution, RE2O3, in the formation of YAGs, presenting similar microstructures and mechanical properties. (C) 2012 Elsevier B.V. All rights reserved. (AU)