Nanocrystalline tetragonal zirconia stabilized with yttrium and hydroxyls

Citation
X. Bokhimi et al., Nanocrystalline tetragonal zirconia stabilized with yttrium and hydroxyls, NANOSTR MAT, 12(1-4), 1999, pp. 593-596
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
NANOSTRUCTURED MATERIALS
ISSN journal
0965-9773 → ACNP
Volume
12
Issue
1-4
Year of publication
1999
Part
A
Pages
593 - 596
Database
ISI
SICI code
0965-9773(199907)12:1-4<593:NTZSWY>2.0.ZU;2-O
Abstract
Nanocrystalline tetragonal zirconia was prepared by soft chemistry. via the hydrolysis of an aqueous solution of zirconyl and yttrium chlorides, and b y using the sol-gel technique with zirconium n-butoxide as precursor and HC l, CH3COOH, and NH4OH as hydrolysis catalysts. In the samples with yttrium, the tetragonal phase appeared yet at crystallization beginning Since the x -ray diffractograms of the amorphous samples were equal and independent of yttrium concentration, it is suggested that yttrium substituted for zirconi um atoms already in the formation of the amorphous structure. In the sol-ge l samples, hydroxyls stabilized the tetragonal phase. After sample dehydrox ylation at 600 degrees C, the main phase was monoclinic zirconia, except in the samples prepared with acetic acid; here, the main phase was tetragonal zirconia, which was stabilized by carboxyls. (C) 1999 Acta Metallurgica In c.