Tailoring of phase assemblage and grain morphology of (Nd,Dy)-containing SiAlON powders prepared by combustion synthesis

resumo

(Nd,Dy)-containing SiAlON powders were prepared by combustion synthesis, where it was proved that the phase assemblage and grain morphology of final products could be tailored by controlling the relative contents of the two rare-earth elements. When the molar ratio of Dy/(Nd + Dy) was increased, the phase content of alpha-SiAlON was promoted and beta-SiAlON was reduced. At the same time, the grain morphology of combustion products varied from elongated prismatic crystals to fine isotropic grains. It was also found that the lattice parameters of both alpha- and beta-SiAlON were affected by Dy/(Nd + Dy) ratios. The experimental results were discussed by considering the different ability of Dy3+ and Nd3+ to stabilize alpha-SiAlON structure. (C) 2006 Elsevier B.V. All rights reserved.

palavras-chave

HIGH-TEMPERATURE SYNTHESIS; CA-ALPHA-SIALON; SILICON-NITRIDE; RIETVELD METHOD; CERAMICS; MICROSTRUCTURE; STABILITY; PHOSPHORS; CRYSTALS; SYSTEM

categoria

Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering

autores

Liu, GH; Chen, KX; Zhou, HP; Jin, HB; Pereira, C; Agrathopoulos, S; Ferreira, JMF

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