TY  - JOUR
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
AU  - Karanović, Ljiljana
AU  - Mitrić, Miodrag
AU  - Poleti, Dejan
AU  - Skala, Dejan
PY  - 1998
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2143
AB  - Powder of alpha-Fe2O3 was mechanochemically treated in a planetary ball mill in an air atmosphere. Structural changes were followed by X-ray diffraction analysis, magnetization measurements and differential scanning calorimetry after various milling times. It was found that complete transformation of alpha-Fe2O3 to Fe3O4 is possible during milling in an air atmosphere under appropriate milling conditions. Presumably, the decrease in the oxygen partial pressure during milling has a critical influence on promoting the dissociation of alpha-Fe2O3. Before nucleation of the Fe3O4 phase, the crystallites of the alpha-Fe2O3 phase are reduced to a minimal size accompanied by the introduction of atomic-level strain. Local modeling of a collision event, coupled with a classical thermodynamic assessment of the Fe2O3-Fe3O4 system, were used to rationalize the experimental results. It is proposed that the mechanochemical reactions proceed at the moment of impact by a process of energization and freezing of highly localized sites of a short lifetime. Excitation on a time scale of similar to 10(-5) s corresponds to a temperature rise of the order of (1-2) x 10(3) K. Decay of the excited state occurs rapidly at a mean cooling rate higher than 10(6) K s(-1). (C) 1998 Elsevier Science S.A. All rights reserved.
T2  - Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing
T1  - Mechanochemical treatment of alpha-Fe2O3 powder in air atmosphere
VL  - 245
IS  - 1
SP  - 109
EP  - 117
DO  - 10.1016/S0921-5093(97)00715-6
ER  - 

@article{
author = "Zdujić, Miodrag and Jovalekić, Čedomir and Karanović, Ljiljana and Mitrić, Miodrag and Poleti, Dejan and Skala, Dejan",
year = "1998",
abstract = "Powder of alpha-Fe2O3 was mechanochemically treated in a planetary ball mill in an air atmosphere. Structural changes were followed by X-ray diffraction analysis, magnetization measurements and differential scanning calorimetry after various milling times. It was found that complete transformation of alpha-Fe2O3 to Fe3O4 is possible during milling in an air atmosphere under appropriate milling conditions. Presumably, the decrease in the oxygen partial pressure during milling has a critical influence on promoting the dissociation of alpha-Fe2O3. Before nucleation of the Fe3O4 phase, the crystallites of the alpha-Fe2O3 phase are reduced to a minimal size accompanied by the introduction of atomic-level strain. Local modeling of a collision event, coupled with a classical thermodynamic assessment of the Fe2O3-Fe3O4 system, were used to rationalize the experimental results. It is proposed that the mechanochemical reactions proceed at the moment of impact by a process of energization and freezing of highly localized sites of a short lifetime. Excitation on a time scale of similar to 10(-5) s corresponds to a temperature rise of the order of (1-2) x 10(3) K. Decay of the excited state occurs rapidly at a mean cooling rate higher than 10(6) K s(-1). (C) 1998 Elsevier Science S.A. All rights reserved.",
journal = "Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing",
title = "Mechanochemical treatment of alpha-Fe2O3 powder in air atmosphere",
volume = "245",
number = "1",
pages = "109-117",
doi = "10.1016/S0921-5093(97)00715-6"
}

Zdujić, M., Jovalekić, Č., Karanović, L., Mitrić, M., Poleti, D.,& Skala, D.. (1998). Mechanochemical treatment of alpha-Fe2O3 powder in air atmosphere. in Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 245(1), 109-117.
https://doi.org/10.1016/S0921-5093(97)00715-6

Zdujić M, Jovalekić Č, Karanović L, Mitrić M, Poleti D, Skala D. Mechanochemical treatment of alpha-Fe2O3 powder in air atmosphere. in Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing. 1998;245(1):109-117.
doi:10.1016/S0921-5093(97)00715-6 .

Zdujić, Miodrag, Jovalekić, Čedomir, Karanović, Ljiljana, Mitrić, Miodrag, Poleti, Dejan, Skala, Dejan, "Mechanochemical treatment of alpha-Fe2O3 powder in air atmosphere" in Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 245, no. 1 (1998):109-117,
https://doi.org/10.1016/S0921-5093(97)00715-6 . .