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Thermodynamic stability of tetragonal zirconia nanocrystallites

Published online by Cambridge University Press:  26 November 2012

Nae-Lih Wu ,
Ton-Fon Wu  and
Irene A. Rusakova
Nae-Lih Wu*
Affiliation:
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China
Ton-Fon Wu
Affiliation:
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China
Irene A. Rusakova
Affiliation:
Texas Center for Superconductivity at University of Houston, Houston, Texas 77204-5932
*
a)Address all correspondence to this author.
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Abstract

The thermodynamic stability of tetragonal (t-) ZrO2 nanocrystallites below the bulk stability temperature 1200 °C was studied through specially synthesized crystallites that exhibited an extremely slow coarsening rate. The nanocrystallites were mechanically transformed to the monoclinic (m-) structure, and, because the crystallite size was kept below approximately 20 nm, the t-structure was completely recovered solely by thermal treatments between 900 and 1100 °C. These results gave strong evidence to the notion that, for sufficiently small crystallite size, nanocrystalline t-ZrO2 is not just kinetically metastable but can be truly thermodynamically more stable than the mpolymorph in air below 1200 °C.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 3 , March 2001 , pp. 666 - 669
Copyright
Copyright © Materials Research Society 2001

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