Articles you may be interested inAnalysis of diffuse phase transition and relaxorlike behaviors in Pb 0.5 Sr 0.5 Ti O 3 films through dc electric-field dependence of dielectric response Appl. Phys. Lett. 90, 242908 (2007); 10.1063/1.2748080Self-poled Pb ( Zr , Ti ) O 3 films with improved pyroelectric properties via the use of ( La 0.8 Sr 0.2 ) MnO 3 /metal substrate heterostructuresThe present paper deals with substrate heterostructure effects on the microstructure and dielectric properties of Sm, Er, and La doped lead titanate (PT) thin films. The substrate heterostructures chosen include Si/ ͑La 0.8 Sr 0.2 ͒MnO 3 (LSMO), Y-stabilized zirconia (YSZ)/LSMO and Si/ Pt. Both LSMO and PT thin films were processed via chemical solution deposition. The results are compared to those of Sm and Er doped lead-zirconate-titanate (PZT). It is shown that the dielectric properties, and particularly the ferroelectric-to-paraelectric transition temperature of PT, are strongly affected by the substrate heterostructure. In comparison to PT on platinized Si, the transition temperature is shifted by more than 100°C towards lower values in the case of Er and Sm doped PT on LSMO, while those of La doped PT and PZT are not affected at all. X-ray photoelectron spectroscopy investigations show a substantial interdiffusion between LSMO and PT. Particularly the diffusion of La towards the ferroelectric film and that of Pb towards LSMO are made responsible for the change in the dielectric properties. In the case of PZT we stipulate the formation of a stable pyrochlore diffusion barrier layer.
Corrosion kinetics of ferritic alloys/steels (Crofer22APU, ITMLC, ZMG232L) were studied at high temperature. An extent of corrosion was evaluated by measuring the oxide scale thickness and the weight gain as a function of heating time. It is shown that even porous layer applied to interconnect can significantly reduce the rate of the steel oxidation. Contribution of the "oxide component" into the total degradation of the SOFC stack performance is estimated. Different protection materials and combinations were tested to analyze their influence on the processes of high temperature oxidation and long-term degradation of Fe-Cr steels. It has been shown that "more soft" materials on the basis of spinels (Mn(Co1 - x Fe x )2O4, Cu1 - x Ni x Mn2O4) are most suitable materials for the use as protective layers in comparison to perovskites. The efficiency of different protective materials was also tested in the real SOFC stacks designed in cooperation with company Staxera GmbH. It has been shown that applied spinel materials can effectively increase the long-term stability of the SOFC stacks
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