Crystallite size-dependent phases in nanocrystalline ZrO(2)-Sc(2)O(3)


Autoria(s): ABDALA, Paula M.; Fantini, Marcia Carvalho de Abreu; Craievich, Aldo Felix; LAMAS, Diego G.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/04/2012

18/04/2012

2010

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

http://dx.doi.org/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