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• W1980167913 endingPage "568" @default.
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• W1980167913 abstract "Surface and interface properties have been investigated for the system Pt/YSZ (yttria-stabilized zirconia). Emphasis is put on an atomistic understanding of the interface properties related to the performance of oxygen sensors based on YSZ. Elemental compositions, electronic structures and work functions are studied on pure and platinum-coated surfaces of single-crystal zirconia doped with 10 mol% yttria and of polycrystalline sintered material doped with 12 mol% yttria. Spectroscopic methods are X-ray (XPS) and u.v. (UPS) photoemission spectroscopy, ion backscattering spectroscopy (ISS) and secondary ion mass spectrometry (SIMS). Large, reversible changes of surface concentrations of yttrium are found between 300 and 1300 K on single-crystal as well as on polycrystalline YSZ. Y-enrichment by a factor between 1.5 and 2.3 is observed at T > 500 K. The electronic work function shows a large reversible change of about +1.4 eV with increasing temperature between 870 and 1170 K, with a weak dependence on the oxygen partial pressure in the range 10−3 to 5 × 10−6 Pa. The main contribution to work function changes results from the shift of the Fermi level relative to the band edges of YSZ. Evaporated platinum contacts are investigated on YSZ surfaces after heat treatment at different oxygen partial pressures. A pronounced tendency is observed for the platinum to form small clusters upon heating in oxygen, already starting at temperatures above 300 °C. Spectroscopic studies show significant compositional changes at the platinum surface and at the contact between platinum and YSZ. Pt—Zr alloys are formed at low oxygen partial pressures. A layer of adsorbed oxygen on platinum is formed at high oxygen partial pressures. For comparison, current—voltage charateristics have also been measured with Pt point-contacts on YSZ single crystals. Cathodic limiting currents proportional to pO2 are observed in the entire partial pressure range investigated (2.1 × 104 to 1.0 × 102 Pa)." @default.
• W1980167913 created "2016-06-24" @default.
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• W1980167913 date "1989-05-01" @default.
• W1980167913 modified "2023-09-29" @default.
• W1980167913 title "Spectroscopic and electrical studies of yttria-stabilized zirconia for oxygen sensors" @default.
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• W1980167913 doi "https://doi.org/10.1016/0250-6874(89)80045-9" @default.
• W1980167913 hasPublicationYear "1989" @default.
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