Reducibility study of oxide-ion conductors La{sub 2-x}Ba{sub x}Mo{sub 2-y}A{sub y}O{sub 9-{delta}} (A = W, Al, Ga) assessed by impedance spectroscopy

Journal Article · Wed Feb 04 04:00:00 EST 2009 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2008.04.015· OSTI ID:21199688

Li, D ^[1]; Wang, X P ^[1]; Zhuang, Z ^[1]; Wang, J X ^[2]; Li, C ^[1]; Fang, Q F ^[1]

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1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)
2. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315040 (China)

The reducibility of oxide-ion conductors La{sub 2-x}Ba{sub x}Mo{sub 2-y}W{sub y}O{sub 9-{delta}} (x = 0, 0.06; y = 0, 0.1, 0.5, 1.0) and La{sub 2}Mo{sub 1.9}A{sub 0.1}O{sub 9-{delta}} (A = Al, Ga) were studied in the reducing atmosphere of 5%H{sub 2} + Ar by means of impedance spectroscopy measurement. The introduction of Ba at La site in La{sub 2}Mo{sub 2-y}W{sub y}O{sub 9} can lower the sintering temperature by about 100 K in comparison with the La{sub 2}Mo{sub 2-y}W{sub y}O{sub 9} samples. All substitutions can enhance the conductivity and improve the reducibility in the temperature range from 548 to 923 K. The double substitution of Ba and W as well as substitution of Al or Ga at Mo sites has a better stabilizing effect than the single tungsten substitution. Among these substitutions the introduction of Al has the best stabilizing effect.

• OSTI ID: 21199688
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 44; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM COMPOUNDS
BARIUM COMPOUNDS
GALLIUM COMPOUNDS
HYDROGEN
IMPEDANCE
IONIC CONDUCTIVITY
LANTHANUM COMPOUNDS
OXIDES
SINTERING
SPECTROSCOPY
TEMPERATURE RANGE 0400-1000 K
TUNGSTEN COMPOUNDS