Study of the structural and electronic properties of Zirconium by jwc45040


									                          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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