Synthesis and electrical properties of scheelite Ca{sub 1-x}Sm{sub x}MoO{sub 4+{delta}} solid electrolyte ceramics

Journal Article · Tue Feb 15 04:00:00 EST 2011 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2010.11.019· OSTI ID:22209989

Cheng, Jihai ^[1]; Liu, Chenfei; Cao, Wenbing; Qi, Mingxing; Shao, Guoquan ^[1]

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1. Department of Chemistry and Materials Engineering, Hefei University, Hefei 230022 (China)

Graphical abstract: Scheelite-type Ca{sub 1-x}Sm{sub x}MoO{sub 4+{delta}} electrolyte ceramics can be considered as one of the best candidates to replace the YSZ electrolyte materials for SOFCs because of their high oxide ion conduction. Research highlights: {yields} Sm{sub x}Ca{sub 1-x}MoO{sub 4+{delta}} solid electrolyte with a tetragonal scheelite structure. {yields} Sm{sub x}Ca{sub 1-x}MoO{sub 4+{delta}} electrolyte is one of the best candidates to replace the YSZ electrolyte for SOFCs because of their high oxide ion conduction. {yields} The sintering temperature is greatly lower than traditional YSZ electrolyte. -- Abstract: Scheelite-type Ca{sub 1-x}Sm{sub x}MoO{sub 4+{delta}} electrolyte powders were prepared by the sol-gel auto-combustion process. The crystal structure of the samples was determined by employing the techniques of X-ray diffraction (XRD). According to the XRD analysis, the formed continuous series of Ca{sub 1-x}Sm{sub x}MoO{sub 4+{delta}} (0 {<=} x {<=} 0.3) solid solutions had the structure of tetragonal scheelite, and the lattice parameters increased with increasing x in the Sm-substituted system. Results of sinterability and electrochemical testing revealed that the performances of Sm-doped calcium molybdate were superior to that of pure CaMoO{sub 4}. Ca{sub 1-x}Sm{sub x}MoO{sub 4+{delta}} ceramics show higher sinterability, and the Ca{sub 0.8}Sm{sub 0.2}MoO{sub 4+{delta}} sample with 98.7% of the theoretical density were obtained after being sintered at 1250 {sup o}C for 4 h. The conductivity increased with increasing samarium content, and a total conductivity 9.54 x 10{sup -3} S cm{sup -1} at 800 {sup o}C could be obtained in Ca{sub 0.8}Sm{sub 0.2}MoO{sub 4+{delta}} sintered at 1250 {sup o}C for 4 h.

• OSTI ID: 22209989
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 46; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CERAMICS
CRYSTAL STRUCTURE
DOPED MATERIALS
ELECTRICAL PROPERTIES
LATTICE PARAMETERS
POWDERS
SOLID ELECTROLYTES
SOLID SOLUTIONS
SPECTROSCOPY
SYNTHESIS
X-RAY DIFFRACTION
YTTRIUM OXIDES
ZIRCONIUM OXIDES