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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Materials Letters; v. 91, p. 283-286, JAN 15 2013.
• Citações Web of Science: 4

Resumo

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)

• Processo FAPESP: 05/51485-8 - Avaliação da citotoxicidade de biocerâmicas
• Beneficiário: Juliana Kelmy Macário Barboza Daguano
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 04/04386-1 - Desenvolvimento e caracterização de pilares cerâmicos biocompatíveis à base de compósitos Zr02-Al2O3
• Beneficiário: Claudinei dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores