Thermal stability of nanocrystalline epsilon -Fe sub(2)O sub(3)

Thermal behavior of highly crystalline epsilon -Fe sub(2)O sub(3) nanoparticles of different apparent crystallite sizes was characterized using thermogravimetry, differential thermal analysis, and analysis of evolved gas by mass spectrometry. Phase composition of the samples was monitored ex situ by...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2014-07, Vol.117 (1), p.85-91
Main Authors: Brazda, Petr, Vecernikova, Eva, Plizingrova, Eva, Lancok, Adriana, Niznansky, Daniel
Format: Article
Language:English
Subjects:
Carbon dioxide
Crystal structure
Crystallites
Diffraction
Iron oxides
Nanoparticles
Thermal stability
X-rays
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Summary:Thermal behavior of highly crystalline epsilon -Fe sub(2)O sub(3) nanoparticles of different apparent crystallite sizes was characterized using thermogravimetry, differential thermal analysis, and analysis of evolved gas by mass spectrometry. Phase composition of the samples was monitored ex situ by X-ray powder diffraction. The results show that the thermal stability of this metastable iron oxide polymorph decreases with increasing particle size. For the particle diameter of 19(2) nm, the transformation temperature was equal to 794(5) degree C, while for 28(2) nm only 755(10) degree C. Surface of the nanoparticles contained adsorbed water and carbon dioxide. Elimination of these species proceeds in two steps. Water is removed at temperatures below 200 degree C and CO sub(2) in the temperature range between 200 and 450 degree C.
ISSN:1388-6150
1572-8943
DOI:10.1007/s10973-014-3711-9