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Novel Fabrication of Ca‐Doped LaNbO 4 Thin‐Film Proton‐Conducting Fuel Cells by Pulsed Laser Deposition
Author(s) -
Magrasó Anna,
Xuriguera Helena,
Varela Manuel,
Sunding Martin F.,
Strandbakke Ragnar,
Haugsrud Reidar,
Norby Truls
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.03650.x
Subject(s) - materials science , pulsed laser deposition , thin film , electrical resistivity and conductivity , analytical chemistry (journal) , annealing (glass) , monoclinic crystal system , doping , electrolyte , non blocking i/o , electrode , nanotechnology , composite material , crystal structure , optoelectronics , crystallography , chemistry , biochemistry , chromatography , electrical engineering , engineering , catalysis
Thin films of 0.5% Ca‐doped La 0.995 Ca 0.005 NbO 4−δ (LCNO) proton‐conducting electrolytes of ∼2 μm thickness were obtained by pulsed laser deposition on NiO–LaNbO 4 composite substrates. The morphology of the films was granular after annealing at T ≤1000°C and evolved to spherical‐like grains at 1100°C and above. The structure and composition of the films were characterized by X‐ray diffraction and X‐ray photoelectron spectrocopy. LCNO films showed the monoclinic fergusonite‐type structure at room temperature. The area‐specific resistance for a ∼2‐μm‐thick electrolyte was in the order of 0.4 Ω·cm 2 at 600°C based on estimates of the electrode area. Temperature dependency of the electrical conductivity at 600°–700°C was comparable with that of bulk disks of the material.