Electrical Conductivity and Phase Transition of Solid Oxide Fuel Cell Electrolyte La2Mo2-xTixO9-δ Ceramics

Ju Mei Yu; Ming Ju Chao; De Chuan Li; Ming Yu Li; Hua Wu; Lin Jie Fu; He Chen

doi:10.4028/www.scientific.net/AMR.557-559.1223

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 557-559Electrical Conductivity and Phase Transition of...

Electrical Conductivity and Phase Transition of Solid Oxide Fuel Cell Electrolyte La₂Mo_2-xTi_xO_9-δ Ceramics

Abstract:

A novel series of ceramic samples La₂Mo_2-xTi_xO_9-δ (x = 0, 0.025, 0.05, 0.075) were prepared by solid-state reaction method. Their structures and phase transitions were studied by XRD, DSC and CTE. Their Electrical conductivities and oxygen ion transport numbers were measured by AC impedance spectroscopy at 773~1073 K and EMF at 673~1073 K, respectively. Results showed that even when x=0.075, the sample was almost pure oxygen ion conductor under the oxygen partial pressure gradient of 1.0 atm/0.21 atm, and though all the Ti-doped samples still underwent α/β structure transition, no abrupt change in the electrical conductivity was observed accompanying with the transition. They exhibited considerably higher electrical conductivity than La₂Mo₂O₉, especially at 773~873 K and the conductivity increased with increasing x value. The value of conductivity for La₂Mo_1.925Ti_0.075O_9-δ reached 8.5×10^-3 S•cm^-1 at 773 K and 0.08 S•cm^-1 at 1,073 K.

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Periodical:

Advanced Materials Research (Volumes 557-559)

Pages:

1223-1227

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.557-559.1223

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Online since:

July 2012

Authors:

Ju Mei Yu, Ming Ju Chao, De Chuan Li, Ming Yu Li, Hua Wu, Lin Jie Fu, He Chen

Keywords:

Electrical Conductivity, Oxygen Ion Conductor, Oxygen Ion Transport Number, Phase Transition

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