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Electrical properties of Sb-doped apatite-type lanthanum silicate materials for SOFCs
- Authors
- Kim, Dae-Young; Lee, Sung-Gap; Jo, Seo-Hyeon
- Issue Date
- Aug-2013
- Publisher
- KOREAN ASSOC CRYSTAL GROWTH, INC
- Keywords
- Solid oxide electrolyte; Apatite-type; Electrical conductivity
- Citation
- JOURNAL OF CERAMIC PROCESSING RESEARCH, v.14, no.4, pp 498 - 501
- Pages
- 4
- Indexed
- SCI
SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF CERAMIC PROCESSING RESEARCH
- Volume
- 14
- Number
- 4
- Start Page
- 498
- End Page
- 501
- ISSN
- 1229-9162
2672-152X
- Abstract
- La9.33-xSbx (SiO4)(6)O-2 (0 <= x <= 2.0) ceramics were fabricated using the standard solid-state synthesis method for solid oxide electrolytes. Increasing the Sb content in apatite-type La9.33-xSbx(SiO4)(6)O-2 leads to an increased unit cell volume. The room-temperature structure is hexagonal, space group P6(3) or P6(3)/m,with a = 9.728 angstrom, and c = 7.191 angstrom for La8.33Sb(SiO4)(6)O-2. The average grain size in sintered specimens was approximately 1.5 to 1.9 mu m. La9.33-xSbx(SiO4)(6)O-2 (1.5 = x = 2.0) apatite ceramics showed the formation of a second phase of La2Si2O7, due to the volatilization of the Sb atoms. The electrical conductivity at 800 degrees C and activation energy of La8.33Sb(SiO4)(6)O-2 doped with 1.0 mol% Sb showed a maximum value of 3.3 x 10(-3) S cm(-1) and 1.47 eV, respectively.
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