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Nanostructured Dense ZrO 2 Thin Films from Nanoparticles Obtained by Emulsion Precipitation
Author(s) -
Woudenberg Fiona C. M.,
Sager Wiebke F. C.,
Elshof Johan E.,
Verweij Henk
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.01430.x
Subject(s) - materials science , cubic zirconia , crystallization , precipitation , crystallite , amorphous solid , chemical engineering , emulsion , monoclinic crystal system , nanoparticle , tetragonal crystal system , coprecipitation , mineralogy , crystallography , composite material , nanotechnology , crystal structure , ceramic , metallurgy , chemistry , physics , meteorology , engineering
Nonagglomerated spherical ZrO 2 particles of 5–8 nm size were made by emulsion precipitation. Their crystallization and film‐forming characteristics were investigated and compared with nanosized ZrO 2 powders obtained by sol–gel precipitation. High‐temperature X‐ray diffraction indicated that the emulsion‐derived particles are amorphous and crystallize at 500°C into tetragonal zirconia, which is stable up to 1000°C. Crystallite growth from 5–20 nm occurred between 500°–900°C. Films of 6–75 nm thickness were made by spreading, spin coating, and controlled deposition techniques and annealed at 500°–600°C. The occurrence of t ‐ZrO 2 in the emulsion‐precipitated powder is explained by the low degree of agglomeration and the corresponding low coarsening on heating to 500°–800°C, whereas the agglomerated state of the sol–gel precipitate powder favors the occurrence of the monoclinic form of zirconia under similar conditions.