AUXÉMÉRY, Aimery; PHILIPPOT, Gilles; SUCHOMEL, Matthew; TESTEMALE, Denis; AYMONIER, Cyril

doi:10.1021/acs.chemmater.0c01550

Metadatos

Mostrar el registro completo del ítem

Licencia de uso del documento

AUXÉMÉRY, Aimery
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

PHILIPPOT, Gilles
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

SUCHOMEL, Matthew
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

Idioma

Article de revue

Este ítem está publicado en

Chemistry of Materials. 2020, vol. 32, n° 19, p. 8169-8181

American Chemical Society

Resumen en inglés

To understand the importance of the particle size on the stabilization of metastable tetragonal ZrO2, ultrafine ZrO2 nanocrystals were synthesized via (i) the precipitation method in supercritical water using nitrate precursors, (ii) the sol–gel method in a supercritical ethanol–water mixture, and (iii) the borderline nonhydrolytic sol–gel route in supercritical ethanol using propoxide precursors. The obtained nanocrystals displayed a variation of the monoclinic versus tetragonal molar fractions from 100 wt % down to ≈10 wt % of monoclinic phase. This variation was concomitant with an overall size decrease of the nanocrystals, ranging from 7 to 2 nm depending on the synthesis procedures. Phase contents were quantified by refinement analysis of X-ray scattering data sets and crosschecked with Raman spectroscopy. Our results suggest that an upper limit of ≈90 wt % of the tetragonal ZrO2 phase is possible, even for ultrafine nanoparticles (2 nm). These findings thus question the existence of any critical size limit below which stabilization of pure t-ZrO2 is attainable at low temperatures.< Leer menos

Palabras clave en inglés

Granular materials

Precursors

Nanoparticles

Ethanol

Physical and chemical processes

Metadatos

Licencia de uso del documento

Stabilization of tetragonal zirconia nanocrystallites using an original supercritical-based synthesis route

Idioma

Este ítem está publicado en

Resumen en inglés

Palabras clave en inglés

DOI

Orígen

Centros de investigación