SURFACE PROPERTIES OF ZrO2 IN EQUILIBRIUM WITH THE GAS PHASE
نویسندگان
چکیده
The surface potential of Y2O3 stabilized Zr02 was measured at 1035 K during the re-equilibration involving oxidation and reduction at oxygen partial pressure between 0.21 and 3.10"^atm. Changes in work function consist of a rapid initial increase due to ionic equilibration and a slow drift of the same sign. Comparison of the obtained results with former electronic emission data of Zr0£ reported by Odier and Loup enables to determine the exponent of oxygen partial pressure dependence of Pt covered with a thin layer of Pt02 /n = 8.1/.
منابع مشابه
Surface chemistry of pure tetragonal ZrO2 and gas-phase dependence of the tetragonal-to-monoclinic ZrO2 transformation.
The surface chemical properties of undoped tetragonal ZrO2 and the gas-phase dependence of the tetragonal-to-monoclinic transformation are studied using a tetragonal ZrO2 polymorph synthesized via a sol-gel method from an alkoxide precursor. The obtained phase-pure tetragonal ZrO2 is defective and strongly hydroxylated with pronounced Lewis acidic and Brønsted basic surface sites. Combined in s...
متن کاملPreparation ZrO2 ceramic coating by electrolytic plasma oxidation and study of the effect of monoclinic/tetragonal phases on the corrosion resistance of the coating
In this paper, zirconium oxide ceramics coating (ZrO2) were produced on Zircaloy-4 alloy using plasma electrolytic oxidation (PEO). Sodium silicate and Sodium aluminate based electrolyte was selected in PEO process and the effects of the concentration of Sodium aluminate (0, 2.5, 5, 7.5, and 10 g/L) on the microstructure, phase structure and the behavior of corrosion of formed coatings. In orde...
متن کاملSurface modification for titanium implants by hydroxyapatite nanocomposite
Background: Titanium (Ti) implants are commonly coated with hydroxyapatite (HA). However, HA has some disadvantages such as brittleness, low tensile strength and fracture toughness. It is desirable to combine the excellent mechanical properties of ZrO2 and the chemical inertness of Al2O3 with respect to the purpose of this project which was coating Ti implants with HA-ZrO2-Al2O3 to modify the s...
متن کاملکلراسیون زیرکونیای آسیابکاری شده
The effects of mechanochemical treatment of monoclinic zirconia in high energy planetary ball mill on its phase transformation were investigated. The mechanical treatment in ball mill reduces the grain size, increases microstrain, and causes phase transition to metastable nanostructured tetragonal and cubic phases. XRD and TEM results show considerable amounts of amorphous phase during ball mil...
متن کاملReforming of Biogas over Co- and Cu-Promoted Ni/Al2O3-ZrO2 Nanocatalysts Synthesized via Sequential Impregnation Method
Utilization of active and stable catalyst could have enormous advantages in industrial application of biogas reforming. In order to achieve this goal, the effects of Cu and Co as promoters were investigated over physical-chemical properties of Ni/Al2O3-ZrO2 catalyst in reforming of biogas. The sequential impregnation was used for preparation of catalysts. The catalysts were characterized using ...
متن کامل