Thermodynamic Analysis of Reaction Profiles Between LaMO3    (  M  = Ni , Co , Mn )  and ZrO2

Abstract

Chemical reactions of LaMO3(M=Ni, Co, Mn) and ZrO2 have been analyzed using chemical potential diagrams for the La-Zr-M-O systems under a condition of P(O2)= 1 bar. A log{a(M)/a(Zr)} vs. log{a(La)/a(Zr)} plot is appropriate for representing diffusion paths, because the layered arrangement of the reaction zone corresponds well to the geometrical configuration of stability polygons of reactants (LaMO~ and ZrO2) and products (La2Zr2OT, MO, La2ZrMO6, etc.). A complicated arrangement including a ternary perovskite phase, La2ZrNiO6, observed in the La2NiO~SZ couple can be represented by ABSTRACT Process control strategies have been developed for reactive ion etching of silicon and silicon dioxide in CF4/O2 and CF4/H2 plasmas. Four measured variables, four manipulated variables, and seven performance variables were considered for both gas mixtures. Relative gain array analysis and singular value decomposition were used to select manipulated/ process variable control loop pairings for feedback control and to evaluate potential difficulties in control system perform-

Porous La0.6Sr0.4CoO3−δ thin film cathodes for large area micro solid oxide fuel cell power generators

“…However, only few results have been reported on µSOFC performance using ceramic electrodes [29][30][31][32]. [33][34][35]) together with the large mismatch in the thermal expansion coefficient of LSC vs. YSZ (TEC LSC = 23 ppm/K; TEC YSZ = 11 ppm/K [36][37][38]) limit its applicability at high operating temperatures or in devices involving high T fabrication steps (T>700ºC). In this sense, alternative electrolytes or barrier diffusion layers are sometimes introduced between the electrolyte and the cathode for reducing these effects but still degradation by detachment is present [39][40][41].…”

Effect of Cathode Microstructure on the Cathode Polarization in the Sintered Strontium-Doped Lanthanum Manganite/Yttria Stabilized Zirconia Solid Oxide Fuel Cells

“…LZO formation cannot be avoided with a La composition less than 86mol% [6,120]. La has at most 1.5mol% solubility in the YSZ [119,120].…”

Chemical Reactivity and Cathode Properties of LaCoO₃ on Lanthanum Silicate Oxyapatite Electrolyte

“…Although the LaCoO 3 shows high performance as SOFC cathode when yttria stabilized zirconia (YSZ) is used as solid electrolyte [1,2], decrease in the cathode performance with continuous SOFC operation condition. Cause of the decrease in the cathode performance is the formation of insulator phase, La 2 Zr 2 O 7 , by the chemical reaction between the YSZ and LaCoO 3 [8][9][10]. Hence, it is necessary to replace the solid electrolyte from YSZ if one wants to utilize the excellent cathode property of LaCoO 3 for SOFC.…”