Neutron diffraction study of the size-induced tetragonal to monoclinic phase transition in zirconia nanocrystals.
Phys Rev Lett
; 90(21): 216103, 2003 May 30.
Article
em En
| MEDLINE
| ID: mdl-12786567
ABSTRACT
Accurate neutron powder diffraction experiments at several temperatures allow one to monitor the reconstructive tetragonal to monoclinic phase transition as a function of the size of zirconia nanoparticles. The structure of the tetragonal phase observed in the nanocrystals is identical to that observed in micrometric zirconia above 1400 K. A uniaxial strain depending on grain size is observed. The phase transition occurs above a threshold crystal size. These results are analyzed within the Landau theory and can be understood as a mechanism of size-dependent phase transition where the primary order parameter is altered by the nanoparticle size.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2003
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Article