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Calorimetric and high-resolution transmission electron microscopy study of nanocrystallization in zirconia gel

Published online by Cambridge University Press:  31 January 2011

Jiří Málek ,
Takefumi Mitsuhashi ,
Julio Ramírez-Castellanos  and
Yoshio Matsui
Jiří Málek
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba, Ibaraki 305, Japan
Takefumi Mitsuhashi
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba, Ibaraki 305, Japan
Julio Ramírez-Castellanos
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba, Ibaraki 305, Japan
Yoshio Matsui
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba, Ibaraki 305, Japan
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Abstract

The formation of metastable tetragonal zirconia nanophase by thermal treatment of a zirconia gel derived from zirconyl chloride has been studied by high-resolution transmission electron microscopy (HRTEM) and differential scanning calorimetry (DSC). HRTEM observations revealed that a fully crystallized sample consists of nanocrystals, around 13 nm in size. This nanocrystalline t-ZrO2 has practically the same crystal structure as that of the high-temperature tetragonal zirconia phase. The nonisothermal crystallization rate is very fast in as-prepared zirconia gel. DSC data at various heating rates can be described by a two-parameter model which predicts the crystallization kinetics in isothermal conditions very well. The Johnson–Mehl–Avrami (JMA) model can be used, however, in partially crystalline samples (crystallinity >30%) where the rate of crystallization process is considerably slower. The kinetic exponent of the JMA model (m = 1.0 ± 0.1) then corresponds to linear dependence of the crystallization rate as a function of the fraction crystallized.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 5 , May 1999 , pp. 1834 - 1843
Copyright
Copyright © Materials Research Society 1999

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