Mechanically Induced Phase Transformation and Surface Segregation in Bismuth-Doped Tetragonal Zirconia |
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| Authors: | Antonino Gulino,Russel G. Egdell,Ignazio Fragalà |
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| Affiliation: | Dipartimento di Scienze Chimiche Universitàdi Catania, 95125 Catania, Italy;Inorganic Chemistry Laboratory, University of Oxford, Oxford OX1 3QR, United Kingdom |
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| Abstract: | Compact pressure causes a martensitic transformation of partially stabilized tetragonal bismuth-doped ZrO2 powders to the monoclinic phase. A similar effect is not observed when pelletization, followed by firing, of amorphous bismuth/ZrO2 is performed. The stress-induced transition has been monitored via X-ray diffractometry, Raman spectroscopy, and Fourier transform infrared reflectivity. Surface bismuth segregation, which involves few ionic planes, has been probed by angle-resolved X-ray photoelectron spectroscopy. The bismuth segregation enthalpy has been evaluated. |
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