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Title: Nanocrystallization and phase transformation in monodispersed ultrafine zirconia particles from various homogeneous precipitation methods

Abstract

Monodispersed ultrafine (nano- to micrometer) zirconia precursor powders were synthesized by three different physicochemical methods: (1) forced hydrolysis, (2) homogeneous precipitation in inorganic salt solutions, and (3) hydrolysis/condensation of alkoxide. The forced hydrolysis method produced monoclinic nanocrystalline particles (cube shaped) of nanometer scale, which depended largely on the initial salt concentration. Methods 2 and 3, both involving the use of alcohol as a solvent, exhibited a faster particle formation rate and generated amorphous ultrafine (submicrometer) monodispersed microspheres, indicating that the presence of alcohol may have stimulated particle nucleation due to its low dielectric property (and, thus, the low solubility of nucleus species in mixed water-alcohol solutions). Nucleation and growth of the particles in solutions are discussed based on the measurements obtained by small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS). High-temperature X-ray diffraction (HTXRD) and TGA/DTA studies elucidated the differences in phase transformation for different types of powders. The most interesting finding was the nonconventional monoclinic nanocrystal nucleation and growth that occurred prior to transformation to the tetragonal phase (at 1,200 C) during the heat treatment of the nanocrystalline powders produced by the forced hydrolysis.

Authors:
; ; ;  [1]
  1. Oak Ridge National Lab., TN (United States)
Publication Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
684421
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 82; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHEMICAL PREPARATION; CRYSTAL-PHASE TRANSFORMATIONS; ZIRCONIUM OXIDES; PARTICLES; PRECIPITATION; NUCLEATION; X-RAY DIFFRACTION; MICROSCOPY

Citation Formats

Hu, M.C.Z., Hunt, R.D., Payzant, E.A., and Hubbard, C.R. Nanocrystallization and phase transformation in monodispersed ultrafine zirconia particles from various homogeneous precipitation methods. United States: N. p., 1999. Web. doi:10.1111/j.1151-2916.1999.tb02085.x.
Hu, M.C.Z., Hunt, R.D., Payzant, E.A., & Hubbard, C.R. Nanocrystallization and phase transformation in monodispersed ultrafine zirconia particles from various homogeneous precipitation methods. United States. doi:10.1111/j.1151-2916.1999.tb02085.x.
Hu, M.C.Z., Hunt, R.D., Payzant, E.A., and Hubbard, C.R. Wed . "Nanocrystallization and phase transformation in monodispersed ultrafine zirconia particles from various homogeneous precipitation methods". United States. doi:10.1111/j.1151-2916.1999.tb02085.x.
@article{osti_684421,
title = {Nanocrystallization and phase transformation in monodispersed ultrafine zirconia particles from various homogeneous precipitation methods},
author = {Hu, M.C.Z. and Hunt, R.D. and Payzant, E.A. and Hubbard, C.R.},
abstractNote = {Monodispersed ultrafine (nano- to micrometer) zirconia precursor powders were synthesized by three different physicochemical methods: (1) forced hydrolysis, (2) homogeneous precipitation in inorganic salt solutions, and (3) hydrolysis/condensation of alkoxide. The forced hydrolysis method produced monoclinic nanocrystalline particles (cube shaped) of nanometer scale, which depended largely on the initial salt concentration. Methods 2 and 3, both involving the use of alcohol as a solvent, exhibited a faster particle formation rate and generated amorphous ultrafine (submicrometer) monodispersed microspheres, indicating that the presence of alcohol may have stimulated particle nucleation due to its low dielectric property (and, thus, the low solubility of nucleus species in mixed water-alcohol solutions). Nucleation and growth of the particles in solutions are discussed based on the measurements obtained by small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS). High-temperature X-ray diffraction (HTXRD) and TGA/DTA studies elucidated the differences in phase transformation for different types of powders. The most interesting finding was the nonconventional monoclinic nanocrystal nucleation and growth that occurred prior to transformation to the tetragonal phase (at 1,200 C) during the heat treatment of the nanocrystalline powders produced by the forced hydrolysis.},
doi = {10.1111/j.1151-2916.1999.tb02085.x},
journal = {Journal of the American Ceramic Society},
number = 9,
volume = 82,
place = {United States},
year = {1999},
month = {9}
}