Crystalline and magnetic structure of multiferroic GaxFe2-xO3 prepared by mechanosynthesis, molten-salts and solid state ceramic methods
Gallium ferrites GaxFe2-xO3 (GFO) are promising multiferroic materials due to their large spontaneous magnetization at room temperature, which coexists with piroelectricity and piezoelectricity in bulk samples. GFO is an orthorhombic ferrite, with a ferrimagnetic transition temperature Tc that can be tuned around room temperature by adjusting the iron concentration. Ferrimagnetic order in GFO is thought to be due to anti-site disorder between Fe and Ga in the four cation sites in the GFO orthorhombic structure: 1 tetrahedral Ga1 site and 3 octahedral Ga2, Fe1, and Fe2 sites. Fully ordered GFO is predicted to be an antiferromagnet, while cation site disorder due to partial occupation of Ga sites by Fe ions gives rise to ferrimagnetic order. Saturation magnetization and Tc depend strongly on the preparation method. Alternatively, corundum GFO, with Tc around 400 K has been synthesized by a high-pressure, high-temperature route. We propose to perform neutron diffraction experiments in GaxFe2-xO3 (x = 0.8, 1.0 and 1.2) powder samples obtained by three different synthesis methods, to study the correlation between structural parameters and the magnetic properties of our samples.
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Lopez de la Torre M. A.; AMADOR Ulises; BLAZQUEZ JAVIER S.; FERNANDEZ FUENTES ANTONIO; O. J. Dura and RITTER Clemens. (2019). Crystalline and magnetic structure of multiferroic GaxFe2-xO3 prepared by mechanosynthesis, molten-salts and solid state ceramic methods. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-728
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