Caruso, R.

Girgsdies, F.

Kasatkin, I.

Ressler, T.

Schattka, J.

Urban, J.

Weiss, K.

English

MPG.PuRe

    Preprint of the Department of Inorganic Chemistry, Fritz-Haber-Institute of the MPG (for personal use only) (www.fhi-berlin.mpg.de/ac)  HRTEM observation of the monoclinic-to-tetragonal (m-t) phase transition in nanocrystalline ZrO2    I. Kasatkin,a,b* F. Girgsdies,a  T. Ressler,a  R.A. Caruso,c J.H. Schattka,c  J. Urban,a  K. Weiss a    a Fritz-Haber-Institut der Max-Planck-Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4-6, D-14195 Berlin, Germany;  bSaint-Petersburg State University, Dept. of Crystallography, Universitetskaja nab. 7/9, 199034  Saint-Petersburg, Russian Federation;  c Max Planck Institute of Colloids and Interfaces, D-14424 Potsdam, Germany. Correspondence e-mail: kassatki@fhi-berlin.mpg.de, kasatkin@ik2494.spb.edu  Keywords: HRTEM, nanoparticles, ZrO2  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.     Summer School on Electron Microscopy, Berlin-Adlershof, 2002 

HRTEM observation of the monoclinic-to-tetragonal (m-t) phase transition in nanocrystalline ZrO<sub>2</sub>

HRTEM observation of the monoclinic-to-tetragonal (m-t) phase transition in nanocrystalline ZrO<sub>2</sub>

Abstract

Similar works

Full text

Available Versions

MPG.PuRe

MPG.PuRe