Phase Composition, Electrical Conductivity, and Stability of ZrO2–Sc2O3–Cr2O3Solid Electrolytes (original) (raw)
2004, Inorganic Materials
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Solid State Ionics, 1998
In search for better ionically conducting ceramics for oxygen separators, fuel cells and sensors, the electrical conductivity and microstructure of the 9 mol% (Sc O-Y O)-ZrO system with varying Sc O / Y O ratios has been investigated in 2 3 2 3 2 2 3 2 3 detail with XRD, SEM, TEM and conductivity measurements as a function of temperature. The stability of electrolyte compositions was studied by continuously monitoring conductivity as a function of time at 850 and 10008C. Impedance spectroscopy was employed for determining the contribution of the grain boundary resistivity. The role of alumina additions to selected Sc O-Y O-ZrO compositions was studied as alumina is known to reduce the grain boundary resistivity by 2 3 2 3 2 scavenging silica impurities and enhance mechanical properties in zirconia-based systems. Al O-containing compositions 2 3 show much higher conductivity degradation compared with alumina-free materials. This behaviour has been investigated in more detail with XRD and TEM analysis.
Ceramic oxide electrolytes based on Ca 0.95 Mg 0.05 Zr 0.98 O 3 for solid galvanic cells application
Advances in Materials Sciences, 2011
The Ca 0.95 Mg 0.05 ZrO 3 nanopowder was successfully synthesized by the citrate method. The XRD diffraction method evaluated that the orthorombic CaZrO 3 phase was detected in powders or sintered samples. The sintered sample at 1450 o C for 2 hours exhibits about 98 % of theoretical density. The electrical conductivity was measured by a.c impedance spectroscopy method in the temperature range of 200-800 o C. The transference oxygen ion number of CaZrO 3 sample was estimated from electromotive force measurements (E m) of galvanic cell in the temperature range of 550-1100 o C. The Ca 0.95 Mg 0.05 ZrO 3 exhibits purely oxygen ion conductivity. It was successfully applied as a solid electrolyte in the electrochemical oxygen sensor operating at 660 o C. The measured electromotive force of investigated cell was found to be linear with the logarithm of oxygen partial pressure in the range of 10-6 atm 1 atm and in the temperature range of 660-1000 o C.
Electrical and Mechanical Properties of ZrO2-Y2O3-Al2O3 Composite Solid Electrolytes
Journal of Electronic Materials, 2021
Strategic priorities in the field of hydrogen energy include the design of intermediate-temperature solid oxide fuel cells capable of highly efficient operation in the temperature range of 573–973 K. Consequently, attempts are being made to replace the widely applied cubic zirconia electrolyte with an electrolyte consisting of tetragonal zirconia. The rationale for this approach is that 3Y-TZP exhibits higher mechanical strength and higher electrical conductivity at temperatures below 973 K. The addition of Al2O3 in an amount that exceeds its solubility limit in 3Y-TZP has been found to result in increased electrical conductivity and improved mechanical properties. The aim of the study was to synthesize 3-YSZ powder via co-precipitation and use it to obtain composites with a 3Y-TZP matrix and 0.5 mol.% or 1.0 mol.% of Al2O3 inclusions. The correlation between these samples' electrical conductivity and resistance to brittle fracture and their phase composition and microstructure ...
International Journal of Materials Science and Engineering, 2019
Y and Sc co-doped ZrO 2 [Zr 0.84 Y 0.08 Sc 0.08 O 1.92 (4Sc4YSZ)] solid electrolyte was prepared via an alkoxide sol-gel route. 4Sc4YSZ was characterized by TG-DTA, XRD, SEM-EDS and AC impedance spectroscopy. XRD patterns showed that co-doping with Y and Sc resulted to the successful stabilization of the highly conductive cubic phase with a lattice parameter of 5.12 Å. Y and Sc dopants are well-distributed within the ZrO 2 particles as evidenced by EDS elemental maps. Total conductivities from 500 °C to 700 °C were determined from AC impedance spectroscopy and an activation energy of 1.31 eV (500-650 °C) was calculated. Even at a low sintering condition of 1200 °C for 5 h, a promising conductivity of 109 mS/cm was achieved for 4Sc4YSZ at 700 °C which is higher than the conductivity of typical 8YSZ solid electrolyte.
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