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Synthesis and microstructural properties of mixed iron-gallium oxides

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Authors
Krehula, Stjepko
Ristić, Mira
Kubuki, Shiro
Iida, Yusuke
Perović, Marija M.
Fabian, Martin
Musić, Svetozar
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Abstract
Various mixed Fe-Ga oxides were prepared by the calcination of mixed Fe-Ga oxyhydroxide precursors (alpha-Fe1 xGaxOOH solid solutions, 0 LT = x LT = 1) at 500 or 1000 degrees C. Isostructural corundum-type oxides alpha-Fe2O3 and alpha-Ga2O3, as well as their solid solutions alpha-Fe-2 xGaxO3 in the entire concentration range (x = 0, 0.4, 1, 1.6 and 2) were prepared by calcination at 500 degrees C. An increase in the Ga content in alpha-Fe2 xGaxO3 resulted in a reduction of the unit cell size, a weakened hyperfine magnetic field, a disappearance of the Morin transition, an increase of magnetization at low temperatures, a shift in the position of IR bands to higher wavenumbers, and a lower intensity of absorption bands in the UV-Vis-NIR spectra. The calcination of Fe-Ga oxyhydroxides at 1000 degrees C resulted in the formation of a rhombohedral alpha-Fe-2 xGaxO3 phase for x = 0 and 0.4. An orthorhombic GaFeO3 phase with Fe3+ cations located in 3 different octahedral sites was obtained by... the calcination at 1000 degrees C of mixed Fe-Ga oxyhydroxide with the Fe:Ga ratio of 1:1. A monoclinic phase b-Fe-2 xGaxO3 (x = 1.6 and 2) was obtained by the calcination at 1000 degrees C of Fe-Ga oxyhydroxides with 80 and 100 mol% Ga. The monoclinic beta-Ga1.6Fe0.4O3 showed two strong luminescence peaks in the blue region of the PL spectrum. (C) 2015 Elsevier B.V. All rights reserved.

Keywords:
Hematite / alpha-Ga2O3 / beta-Ga2O3 / GaFeO3 / Mossbauer spectroscopy / FE-SEM
Source:
Journal of Alloys and Compounds, 2015, 634, 130-141
Projects:
  • Croatian Centre of Excellence for Advanced Materials and Sensing Devices

DOI: 10.1016/j.jallcom.2015.02.065

ISSN: 0925-8388; 1873-4669

WoS: 000350915200022

Scopus: 2-s2.0-84923562439
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http://vinar.vin.bg.ac.rs/handle/123456789/265
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