Structural and Transport Properties of Doped LAMOX — Electrolytes for IT SOFC
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Conference |
20th International Conference on Solid State Ionics (SSI-20)
14-19 Jun 2015
,
Keystone
|
| Journal |
Solid State Ionics
ISSN: 0167-2738
|
| Output data |
Year: 2016,
Volume: 288,
Pages: 103-109
Pages count
: 7
DOI:
10.1016/j.ssi.2016.01.026
|
| Tags |
Ionic conductivity, LAMOX, Oxygen diffusion, Synthesis |
| Authors |
Pavlova S.
1
,
Bespalko Y.
1
,
Sadykov V.
1,2
,
Eremeev N.
1
,
Krieger T.
1,2
,
Sadovskaya E.
1,2
,
Ishchenko A.
1,2
,
Bobin A.
1,2
,
Uvarov N.
3
,
Smirnova A.
4
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, Prosp. Acad. Lavrentieva, 5, 630090, Novosibirsk, Russian Federation
|
| 2 |
Novosibirsk State University, Novosibirsk, Russian Federation
|
| 3 |
Institute of Solid State Chemistry SB RAS, Novosibirsk, Russian Federation
|
| 4 |
South Dakota School of Mines and Technology, Rapid City, SD 57701, USA
|
|
Funding (2)
|
1
|
Russian Science Foundation
|
16-13-00112
|
|
2
|
American Chemical Society
|
12658
|
Doped La2 − xRxMo2 − yWyO9 (R = Bi, Gd, Pr, Sm, Nd; x = 0–0.5, y = 0.5–1) were synthesized via polymerized precursors method or high power mechanical milling (MM). The study of doped LAMOX genesis and structural properties using thermal analysis, XRD, TEM has revealed that for all cations substituting La-position, the pure cubic β-phase is formed from polymerized precursors after calcination at 700 °C. W-doped LAMOX have been obtained via low temperature calcination of MM products. Due to a high dispersion of powders, high density pellets of doped LAMOX ceramics have been already obtained after sintering at 950 °C. Their electrical conductivity measured by impedance spectroscopy varies in the range of 2.3–5.6 · 10− 3 S/cm at 630 °C depending on the doping cation nature. The self-diffusion coefficient (DO) values calculated from corresponding conductivities is in the range of 6–14 · 10− 9 cm2/s at 630 °C agreeing well with those from the data of C18O2 SSITKA for oxygen isotope exchange with powders of LAMOX.