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Confinement and surface effects on the physical properties of rhombohedral-shape hematite (α-Fe2O3) nanocrystals

 

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Opened Access Confinement and surface effects on the physical properties of rhombohedral-shape hematite (α-Fe2O3) nanocrystals
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Author: Luna, Carlos
Cuán Guerra, Aída D.
Barriga Castro, E. D.
Núñez Álvarez, Nuria Ofelia
Mendoza Reséndez, R.
Date: 2016
Published in: Materials Research Bulletin, 80, 44-52.
Document type: Article
Abstract: Morphological, microstructural and vibrational properties of hematite (α-FeO) nanocrystals with a rhombohedral shape and rounded edges, obtained by forced hydrolysis of iron(III) solutions under a fast nucleation, have been investigated in detail as a function of aging time. These studies allowed us to propose a detailed formation mechanism and revealed that these nanocrystals are composed of four {104} side facets, two {110} faces at the edges of the long diagonal of the nanocrystals and two {-441} facets as the top and bottom faces. Also, the presence of nanoscopic pores and fissures was evidenced. The vibrational bands of such nanocrystals were shifted to lower frequencies in comparison with bulk hematite ones as the nanocrystal size was reduced due to phonon confinement effects. Also, the indirect and direct transition band gaps displayed interesting dependences on the aging time arising from quantum confinement and surface effects
Cite: Luna, C., Cuán Guerra, A.D., Barriga Castro, E.D., Núñez Álvarez, N.O. y Mendoza Reséndez, R. (2016). Confinement and surface effects on the physical properties of rhombohedral-shape hematite (α-Fe2O3) nanocrystals. Materials Research Bulletin, 80, 44-52.
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URI: https://hdl.handle.net/11441/79555

DOI: 10.1016/j.materresbull.2016.03.029

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