authors |
Lima, CGM; Araujo, AJM; Silva, RM; Raimundo, RA; Grilo, JPF; Constantinescu, G; Kovalevsky, AV; Macedo, DA |
nationality |
International |
journal |
JOURNAL OF SOLID STATE CHEMISTRY |
author keywords |
Ca2Fe2O5; Proteic sol-gel synthesis; Solid-state reaction; Mollusk shells; Electrical properties |
keywords |
THERMOELECTRIC PROPERTIES; MAGNETIC-PROPERTIES; DOPED CA2FE2O5; GRAIN-SIZE; CATHODE; OXIDE; NANOPARTICLES; CONDUCTIVITY; CERAMICS; BEHAVIOR |
abstract |
In this work, brownmillerite-type calcium ferrite (Ca2Fe2O5) ceramics were prepared by two distinct routes, namely by a proteic sol-gel synthesis using commercial flavorless gelatin, and by a solid-state reaction method using mollusk shells. XRD analyses revealed single phase brownmillerite-type calcium ferrites in both cases. SEMEDS analysis of sintered Ca2Fe2O5 ceramics revealed larger grain sizes for the samples prepared via the solid-state reaction. All samples possessed a p-type conduction mechanism, with the largest power factor of similar to 2 mu Wm(-1) K-2 at 450 degrees C observed for the samples obtained via the solid state reaction. The charge transport mechanism was found to depend on the preparation route. The obtained results demonstrated that the proposed synthesis routes can be successfully employed for the preparation of single-phase brownmillerite-type materials. |
publisher |
ACADEMIC PRESS INC ELSEVIER SCIENCE |
issn |
0022-4596 |
isbn |
1095-726X |
year published |
2021 |
volume |
299 |
digital object identifier (doi) |
10.1016/j.jssc.2021.122172 |
web of science category |
7 |
subject category |
Chemistry, Inorganic & Nuclear; Chemistry, Physical |
unique article identifier |
WOS:000647792400022
|