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Crystal Research and Technology |
Cryst. Res. Technol. 39,
421 (2004) - Abstract -
Electron microscopy investigations on structures of ZrO2-rich phases in the quasibinary system ZrO2-Zr3N4
A. T. Tham, C. Rödel, M. Lerch, D. Wang*, D. S. Su*, A. Klein-Hoffmann*, and R. Schlögl*
Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
*Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
Slowly cooled nitrided zirconia samples were investigated and characterized by means of transmission electron microscopy (TEM). Besides the well-known different modifications of ZrO2 some ZrO2-rich oxynitride phases could be further found, called β-type phases. An overview regarding the formation of such different structural modifications could be gained, supported by previously performed measurements using powder X-ray diffractometry (XRD). Similar to fast cooled nitrided zirconia samples Zr(N,O), the slowly cooled ones also contain different kinds of ZrO2 precipitates, which can be obviously emphasized by using the methods of diffraction contrast. A super cell was successively built, derived from the unit cells of the β and β’ phase, in order to explain the structure of the observed modulated β’’ phase. Agreements from the comparisons between experimental high resolution images and the simulated ones of such modulated structures confirm the suggested starting points.
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