Crystallite size-dependent phases in nanocrystalline ZrO(2)-Sc(2)O(3)
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/04/2012
18/04/2012
2010
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Resumo |
ZrO(2)-10, 12 and 14 mol% Sc(2)O(3) nanopowders were prepared by using a nitrate-lysine gel-combustion synthesis. These materials were studied by synchrotron X-ray powder diffraction (SXPD) and Raman spectroscopy after calcination at different temperatures from 650 to 1200 degrees C, which led to samples with different average crystallite sizes, up to about 100 nm. The results from SXPD and Raman analyses indicate that, depending on Sc(2)O(3) content, the metastable t ''-form of the tetragonal phase or the cubic phase are fully retained at room temperature in nanocrystalline powders, provided an average crystallite sizes lower than similar to 30 nm. By contrast, powders with larger average crystallite sizes exhibit the stable rhombohedral, beta and gamma, phases and do not retain or very partially retain the metastable t '' and cubic ones. Brazilian Synchrotron Light Laboratory (LNLS, Brazil)[D10B-XPD-5364] Brazilian Synchrotron Light Laboratory (LNLS, Brazil)[6723] Brazilian Synchrotron Light Laboratory (LNLS, Brazil)[7296] CNPq-CONICET CAPES-MinCyT (Brazil-Argentina) CNPq (Brazil)[490289/2005-3] CNPq (Brazil)[490580/2008-4] FONCyT - Agencia Nacional de Promocion Cientifica y Tecnologica (Argentina)[38309] FONCyT - Agencia Nacional de Promocion Cientifica y Tecnologica (Argentina)[01152] CONICET (Argentina)[6559] Latin-American Centre for Physics (CLAF) YPF foundation |
Identificador |
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.12, n.12, p.2822-2829, 2010 1463-9076 http://producao.usp.br/handle/BDPI/15950 10.1039/b922541b |
Idioma(s) |
eng |
Publicador |
ROYAL SOC CHEMISTRY |
Relação |
Physical Chemistry Chemical Physics |
Direitos |
closedAccess Copyright ROYAL SOC CHEMISTRY |
Palavras-Chave | #RAY-POWDER DIFFRACTION #SOLID-SOLUTIONS #RAMAN-SCATTERING #TETRAGONAL PHASE #ZIRCONIA #BOUNDARY #STABILIZATION #SCANDIA #SYSTEM #Chemistry, Physical #Physics, Atomic, Molecular & Chemical |
Tipo |
article original article publishedVersion |