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Polymorphic phase transition in nanoparticles of ZrO2 (HRTEM characterization)

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Kasatkin,  Igor
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

Caruso,  Rachel A.
Max Planck Society;

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Girgsdies,  Frank
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Ressler,  Thorsten
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

Schattka,  Jan H.
Max Planck Society;

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Urban,  Joachim
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Kasatkin, I., Caruso, R. A., Girgsdies, F., Ressler, T., Schattka, J. H., & Urban, J. (2002). Polymorphic phase transition in nanoparticles of ZrO2 (HRTEM characterization). Poster presented at Autumn School, Progress in Materials Science through Electron Microscopy, Berlin, Germany.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-1394-2
Abstract
Monoclinic-to-tetragonal (m ? t) phase transitions within unconstrained nanoparticles of ZrO2 in situ observed and characterized with high-resolution transmission electron microscopy (HRTEM) lead to the following orientation relations between the phases: 1) m(100) || t(110), m[001] || t[001]; 2) m(013) || t(116), m[001] || t[001]; 3) m(100) || t(001), m[001] || t[110]; 4) m(011) || t(100), m[001] || t[110]. The relations 1and 3 occur most frequently; the relations 2 and 4 were found only in combination with 1and 3 in the "core-shell" structures. The tetragonal phase nucleates at the free (100) surfaces of the monoclinic particles. During the transition both the phases coexist within a particle; the m-t interface is coherent. A geometric model of the interface is proposed. The transition is induced by the electron beam and occurs within the region of thermodynamic instability of the bulk tetragonal phase of zirconia. The tetragonal phase is stabilized by small crystallite size due to the lower surface free energy of t-ZrO2