Anisotropic growth of α-Fe2O3 nanostructures. Issue 4 (March 2018)

• Record Type: Journal Article
• Authors: Jesus, J.R.; Lima, R.J.S.; Moura, K.O.; Duque, J.G.S.; Meneses, C.T.
• Is Part Of: Ceramics international. Volume 44:Issue 4(2018)
• Page Start: 3585
• Page End: 3589
• Publication Date: 2018-03
• Subjects: Preferential growth -- Anisotropic growth -- Magnetic properties -- Hematite -- Fe2O3; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.11.068
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this work, we report on the anisotropic growth of α -Fe2 O3 nanoslabs which are produced by co-precipitation method with the addition of sucrose. In our previous work, we have argued that such behavior can be related with the chelating agent. Experiments of X-ray diffraction (XRD), high-resolution transmission electronic microscopy (HRTEM) and magnetic measurements as a function of temperature and an applied magnetic field are used to characterize the samples. The HRTEM image of the sample prepared with 10 mmol/l of sucrose consists of faceted-like nanoslabs while that prepared without sucrose exhibits particles with a non-uniform shape. In this way, we can state that both the HRTEM images and the analysis of the XRD patterns show clearly a preferential growth of the [110] crystallographic direction. To strengthen our supposition, besides T - and field-dependence of magnetization are consistent with a superparamagnetic behavior the fit of the (Zero Field Cooling and Field Cooling) ZFC-FC curve for sample grown with 10 mmol/l of sucrose presents a strong increase of the effective anisotropy constant, K eff, which can be related with the increasing of the shape magnetic anisotropy.