The ball milling induced transformation of alpha-Fe2O3 powder in air and oxygen atmosphere
Апстракт
The mechanochemical treatment of alpha-Fe2O3 powder was done concurrently in air and oxygen atmospheres using a conventional planetary ball mill. The influence of the duration of milling and of the balls-to-powder mass ratio on the transformation of alpha-Fe2O3 was investigated. Under appropriate milling conditions, alpha-Fe2O3, completely transforms to Fe3O4, and for prolonged milling to the Fe-1 _ O-x phase, either in air or oxygen atmosphere. Owing to the higher oxygen pressure, the start of the reaction in oxygen is delayed by similar to 1 h in comparison with the reaction in air. The reverse mechanochemical reaction Fe-1 . O-- GT Fe3O4-- GT , alpha-Fe2O3 takes place under proper oxygen atmosphere. The oxygen partial pressure is the critical parameter responsible for the mechanochemical reactions. The balls-to-powder mass ratio has a considerable influence on the kinetics of mechanochemical reactions. Below the threshold value the reaction does not proceed or proceeds very slowly. ...Plausibly, three phenomena govern mechanochemical reactions: (i) the generation of highly energetic and localized sites of a short lifetime at the moment of impact; (ii) the adsorption of oxygen at atomically dean surfaces created by particle fracture; and (iii) the change of activities of the constituent phases arising from a very distorted (nanocrystalline) structure. (C) 1999 Elsevier Science S.A. All rights reserved.
Кључне речи:
Fe-O system / hematite / phase transformation / mechanochemical synthesisИзвор:
Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 1999, 262, 1-2, 204-213
DOI: 10.1016/S0921-5093(98)01009-0
ISSN: 0921-5093
WoS: 000079231100024
Scopus: 2-s2.0-0000865965
Колекције
Институција/група
VinčaTY - JOUR AU - Zdujić, Miodrag AU - Jovalekić, Čedomir AU - Karanović, Ljiljana AU - Mitrić, Miodrag PY - 1999 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2232 AB - The mechanochemical treatment of alpha-Fe2O3 powder was done concurrently in air and oxygen atmospheres using a conventional planetary ball mill. The influence of the duration of milling and of the balls-to-powder mass ratio on the transformation of alpha-Fe2O3 was investigated. Under appropriate milling conditions, alpha-Fe2O3, completely transforms to Fe3O4, and for prolonged milling to the Fe-1 _ O-x phase, either in air or oxygen atmosphere. Owing to the higher oxygen pressure, the start of the reaction in oxygen is delayed by similar to 1 h in comparison with the reaction in air. The reverse mechanochemical reaction Fe-1 . O-- GT Fe3O4-- GT , alpha-Fe2O3 takes place under proper oxygen atmosphere. The oxygen partial pressure is the critical parameter responsible for the mechanochemical reactions. The balls-to-powder mass ratio has a considerable influence on the kinetics of mechanochemical reactions. Below the threshold value the reaction does not proceed or proceeds very slowly. Plausibly, three phenomena govern mechanochemical reactions: (i) the generation of highly energetic and localized sites of a short lifetime at the moment of impact; (ii) the adsorption of oxygen at atomically dean surfaces created by particle fracture; and (iii) the change of activities of the constituent phases arising from a very distorted (nanocrystalline) structure. (C) 1999 Elsevier Science S.A. All rights reserved. T2 - Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing T1 - The ball milling induced transformation of alpha-Fe2O3 powder in air and oxygen atmosphere VL - 262 IS - 1-2 SP - 204 EP - 213 DO - 10.1016/S0921-5093(98)01009-0 ER -
@article{ author = "Zdujić, Miodrag and Jovalekić, Čedomir and Karanović, Ljiljana and Mitrić, Miodrag", year = "1999", abstract = "The mechanochemical treatment of alpha-Fe2O3 powder was done concurrently in air and oxygen atmospheres using a conventional planetary ball mill. The influence of the duration of milling and of the balls-to-powder mass ratio on the transformation of alpha-Fe2O3 was investigated. Under appropriate milling conditions, alpha-Fe2O3, completely transforms to Fe3O4, and for prolonged milling to the Fe-1 _ O-x phase, either in air or oxygen atmosphere. Owing to the higher oxygen pressure, the start of the reaction in oxygen is delayed by similar to 1 h in comparison with the reaction in air. The reverse mechanochemical reaction Fe-1 . O-- GT Fe3O4-- GT , alpha-Fe2O3 takes place under proper oxygen atmosphere. The oxygen partial pressure is the critical parameter responsible for the mechanochemical reactions. The balls-to-powder mass ratio has a considerable influence on the kinetics of mechanochemical reactions. Below the threshold value the reaction does not proceed or proceeds very slowly. Plausibly, three phenomena govern mechanochemical reactions: (i) the generation of highly energetic and localized sites of a short lifetime at the moment of impact; (ii) the adsorption of oxygen at atomically dean surfaces created by particle fracture; and (iii) the change of activities of the constituent phases arising from a very distorted (nanocrystalline) structure. (C) 1999 Elsevier Science S.A. All rights reserved.", journal = "Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing", title = "The ball milling induced transformation of alpha-Fe2O3 powder in air and oxygen atmosphere", volume = "262", number = "1-2", pages = "204-213", doi = "10.1016/S0921-5093(98)01009-0" }
Zdujić, M., Jovalekić, Č., Karanović, L.,& Mitrić, M.. (1999). The ball milling induced transformation of alpha-Fe2O3 powder in air and oxygen atmosphere. in Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 262(1-2), 204-213. https://doi.org/10.1016/S0921-5093(98)01009-0
Zdujić M, Jovalekić Č, Karanović L, Mitrić M. The ball milling induced transformation of alpha-Fe2O3 powder in air and oxygen atmosphere. in Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing. 1999;262(1-2):204-213. doi:10.1016/S0921-5093(98)01009-0 .
Zdujić, Miodrag, Jovalekić, Čedomir, Karanović, Ljiljana, Mitrić, Miodrag, "The ball milling induced transformation of alpha-Fe2O3 powder in air and oxygen atmosphere" in Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 262, no. 1-2 (1999):204-213, https://doi.org/10.1016/S0921-5093(98)01009-0 . .