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Thermal stability of platinum, palladium and silver films on yttrium-stabilised zirconia

Beck, Gesa ; Bachmann, Christoph ; Bretzler, Rita ; Kmeth, Ralf

Thin solid films, 2014-12, Vol.573, p.164-175 [Peer Reviewed Journal]

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  • Title:
    Thermal stability of platinum, palladium and silver films on yttrium-stabilised zirconia
  • Author: Beck, Gesa ; Bachmann, Christoph ; Bretzler, Rita ; Kmeth, Ralf
  • Subjects: Silver ; Annealing ; Palladium ; Microstructure ; Platinum ; Rare earth metals ; Grain boundaries ; Zirconium ; Zirconium oxide
  • Is Part Of: Thin solid films, 2014-12, Vol.573, p.164-175
  • Description: Platinum, palladium and silver films with different microstructures have been prepared on differently orientated yttrium-stabilised zirconia (YSZ) substrates by pulsed laser deposition and then annealed at temperatures between 200°C and 850°C. Thereby, an influence of the type of metal, of the microstructure of the as-prepared film and of the orientation of the substrate on the annealing behaviour could be determined. The following annealing effects were observed for platinum, palladium and silver films: i) sharpening of the film boundary, ii) smoothing of the film surfaces, iii) sharpening of the texture [thereby: reduction of the fraction of small angle and twin grain boundaries], iv) grain growth and accordingly reduction of the fraction of grains as well as v) grooving at grain boundaries, vi) void formation at the metal|YSZ-interface, vii) hole formation within the films and viii) reduction of the fraction of droplets. In the case of palladium films also ix) oxidation [between 300°C≤T<750°C] and stronger de-wetting phenomena than for platinum [with x) waving of the film and xi) island formation at T≥750°C] have been found. Silver films are not oxidised, but show stronger de-wetting phenomena than platinum and palladium, with xi) island formation and xii) evaporation of the silver at T≥550°C. Interestingly, silver films on (111) orientated YSZ are thermally much more stable than silver films on the other orientated substrates up to 750°C. The annealing effects were described by interface, grain boundary and surface energy minimization. •The thermal stability of Pt, Pd and Ag films has been investigated up to 850°C.•Annealing effects are e.g. reduction of the fraction of twins and island formation.•Pd is also oxidised between 300°C≤T<750°C.•Annealing effects depend on type of metal and on its initial microstructure.•Annealing effects depend also on the orientation of substrate.
  • Publisher: Elsevier BV
  • Language: English
  • Identifier: ISSN: 0040-6090
    EISSN: 1879-2731
    DOI: 10.1016/j.tsf.2014.11.035
  • Source: DataCite

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