Loading…
Reduction kinetics of hematite to magnetite under hydrothermal treatments
The phase transformation of α-Fe 2 O 3 to Fe 3 O 4 was observed by the hydrothermal treatment of a ferric solution at 160-220 °C with the addition of both KOH and EDA into the reaction system. The reactions began with the formation of α-Fe 2 O 3 hexagonal plates followed by the phase transformation...
Saved in:
| Published in: | RSC advances 2015-01, Vol.5 (22), p.17236-17244 |
|---|---|
| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The phase transformation of α-Fe
2
O
3
to Fe
3
O
4
was observed by the hydrothermal treatment of a ferric solution at 160-220 °C with the addition of both KOH and EDA into the reaction system. The reactions began with the formation of α-Fe
2
O
3
hexagonal plates followed by the phase transformation involving the dissolution of the α-Fe
2
O
3
hexagonal platelets, the reduction of Fe
3+
to Fe
2+
, and the nucleation and growth of new Fe
3
O
4
polyhedral particles. The activation energies for the phase transformation of α-Fe
2
O
3
to Fe
3
O
4
under hydrothermal conditions are estimated to be 96.4 ± 11, 113.1 ± 5, and 118.3 ± 11 kJ mol
−1
for the addition of 0.5, 1 and 1.5 ml of EDA, respectively, which are about the same for the typical phase transformation of α-Fe
2
O
3
to Fe
3
O
4
in a hydrogen atmosphere.
The phase transformation of α-Fe
2
O
3
to Fe
3
O
4
was observed by the hydrothermal treatment of a ferric solution at 160-220 °C with the addition of both KOH and EDA into the reaction system. |
|---|---|
| ISSN: | 2046-2069 2046-2069 |
| DOI: | 10.1039/c4ra12389a |