Thermodynamic stability of tetragonal zirconia nanocrystallites
- 1 March 2001
- journal article
- Published by Springer Science and Business Media LLC in Journal of Materials Research
- Vol. 16 (3), 666-669
- https://doi.org/10.1557/jmr.2001.0114
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.Keywords
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