Thin Solid Films, Dec 31, 2014, Vol.573, p.164(12)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.tsf.2014.11.035 Byline: Gesa Beck, Christoph Bachmann, Rita Bretzler, Ralf Kmeth Abstract: 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[degrees]C and 850[degrees]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[degrees]C[less than or equal to] T 〈750[degrees]C] and stronger de-wetting phenomena than for platinum [with x) waving of the film and xi) island formation at T [greater than or equal to]750[degrees]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 [greater than or equal to]550[degrees]C. Interestingly, silver films on (111) orientated YSZ are thermally much more stable than silver films on the other orientated substrates up to 750[degrees]C. The annealing effects were described by interface, grain boundary and surface energy minimization. Article History: Received 17 March 2014; Revised 7 November 2014; Accepted 10 November 2014
Rare Earth Metals ; Palladium ; Rare Earth Metal Compounds ; Zirconium Oxide ; Grain Boundaries ; Zirconium ; Annealing
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