ısica da Mat´ria Condensada / ID: 252-1 XXX Encontro Nacional de F´ e 1 Study of the structural and electronic properties of Zirconium oxide surfaces Marques R. M.C., Archanjo B. S., Soares E. A., Carvalho V. E., Paniago R. Universidade Federal de Minas Gerais The study of metal oxide surfaces is a ﬁeld of basic importance to the complete understanding of some phenomena in the ﬁeld of sciences of materials, such as heterogenic catalysis, functioning of gas sensors and growth of nanoparticles. Zirconia is considered an important material in many technological and scientiﬁc areas for showing an excellent combination of high resistance and raised hardness. Among others applications, this oxide can be used as fuel cells and oxygen sensor, due to its property of ionic conduction. In most of the applications, it appears in the cubical form stabilized by the addition of Y2 O3 . The necessity in the use of this doped oxide comes from a problem during the cooling of the c-Zirconia that suﬀers a phase transition from tetragonal to monoclinic after the sintering process during the sample manufacture. The monoclinic phase is the most stable at room temperature but, it is also the most fragile and breakable. Therefore, to prevent this problem, Ytrio (Y 3+ ) is added in an amount enough not to modify the Zirconia properties during the cooling. In this work the results of the structural and morphologic characterization of surfaces (111) and (110) of c − ZrO2 stabilized with Y2 O3 will be presented. The techniques of X-ray Photoelectron Spectroscopy (XPS) and Atomic Force Microscopy (AFM) have been used. Each sample was annealed at temperatures of 600◦ C, 900◦ C and 1300◦ C, in atmospheric pressure, for approximately 10 hours. After each thermal treatment, the samples were studied by AFM, in atmospheric pressure, and were also analyzed by XPS in Ultra-High-Vacuum (≈ 1 × 10−10 mbar). The obtained results will be presented and discussed.
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