Abstract
Thin films of the Lu-Fe-O system were deposited by aerosol assisted MOCVD on silica glass substrates. Hexagonal h-LuFeO3, garnet Lu3Fe5O12, perovskite o-LuFeO3 or hematite Fe2O3 phases were obtained, depending on the thermodynamic deposition conditions or post annealing temperature. Magnetic measurements confirm the ferromagnetic behaviour at room temperature of the thin films with garnet phase. An indirect bandgap of 1.78 eV was measured.
Highlights
The Lu-Fe-O system has received a great deal of attention due to the multiferroic properties of several phases of the system [1, 2]
Wang suggests a Van't Hoff diagram for this system, as a result of his studies during PLD deposition of thin films on MgO (111) substrates [7]. According to this diagram it would be possible to obtain a mixture between the h-LuFeO3 and LuFe2O4 phases by controlling the oxygen partial pressure around 2.7x10-5 mbar at 900°C
In the deposition of thin films by MOCVD[9], metalorganic precursors, Lu(tmhd)3 and Fe(tmhd)3, were synthesized from tmhd (2,2,6,6-tetramethyl-3,5-heptanedione) using the method described by Eisentraut and Severs [10] and purified by sublimation
Summary
The Lu-Fe-O system has received a great deal of attention due to the multiferroic properties of several phases of the system [1, 2]. The 1⁄2Lu2O3-1⁄2Fe2O3-FeO phase diagram is presented in figure 1a), following the sketches by Sekine [5], Kumar [6] and Wang [7] According to this diagram it is important to consider the mixed valence states Fe(II)/Fe (III), adjustable by oxygen partial pressures during sample preparation. The LuFeO3 structure exhibits distortion from ideal perovskite due to the small ionic rare earth radius This compound has two different structures: a stable Pnma orthorhombic perovskite (o-LuFeO3) and a metastable hexagonal phase P63cm (h-LuFeO3). Wang suggests a Van't Hoff diagram for this system, as a result of his studies during PLD deposition of thin films on MgO (111) substrates [7] According to this diagram it would be possible to obtain a mixture between the h-LuFeO3 and LuFe2O4 phases by controlling the oxygen partial pressure around 2.7x10-5 mbar at 900°C.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
