authors |
Vitorino, N; Oliveira, FAC; Marcelo, T; Abrantes, JCC; Trindade, B |
nationality |
International |
journal |
CERAMICS INTERNATIONAL |
author keywords |
Apatite-type electrolyte; SOFC; Mechanical alloying; Impedance spectroscopy; Electrical properties |
keywords |
DOPED LANTHANUM SILICATE; APATITE-TYPE; DEFECT CHEMISTRY; ELECTROLYTES; CONDUCTIVITY; MICROSTRUCTURE; SOFC; GERMANATES; ROUTE; BULK |
abstract |
La9.33Si2Ge4O26 materials have been fabricated from La2O3, SiO2 and GeO2 powders by high speed mechanical alloying followed by conventional and microwave hybrid sintering at different temperatures and holding times. XRD data showed that the apatite phase is formed after 1 h of mechanical alloying at 850 rpm. This phase remained stable after conventional sintering in an electric furnace with density increasing as sintering temperatures and holding times were increased. However, the highest density was achieved for samples sintered in the microwave furnace (5.44 g cm(-3)), corresponding to a relative density of 98%. The electrical conductivity of the samples microwave sintered at 700 and 800 degrees C are 4.72x10(-3) and 1.93x10(-2) S.cm(-1), respectively, with a correspondent activation energy of 0.952 eV. |
publisher |
ELSEVIER SCI LTD |
issn |
0272-8842 |
isbn |
1873-3956 |
year published |
2017 |
volume |
43 |
issue |
4 |
beginning page |
3847 |
ending page |
3853 |
digital object identifier (doi) |
10.1016/j.ceramint.2016.12.043 |
web of science category |
Materials Science, Ceramics |
subject category |
Materials Science |
unique article identifier |
WOS:000393937900053
|