title: Expansion of the hexagonal phase-forming region of Lu1-xScxFeO3 by containerless processing.
abstract: Hexagonal Lu1-xScxFeO3 (0 ≤ x ≤ 0.8) was directly solidified from an undercooled melt by containerless processing with an aerodynamic levitation furnace. The hexagonal phase-forming region was considerably extended compared to that of the conventional solid-state reaction (x ∼ 0.5). Synchrotron X-ray diffraction measurements revealed that the crystal structure of the hexagonal phase was isomorphous to hexagonal ferroelectric RMnO3 (R = a rare earth ion) with a polar space group of P63cm. As x increased, the a-axis lattice constant decreased linearly, strengthening the antiferromagnetic interaction between the Fe(3+) ions on the a-b plane. Accordingly, the weak ferromagnetic transition temperature increased from 150 K for x = 0 to 175 K for x = 0.7. These transition temperatures were much higher than those of hexagonal Lu1-xScxMnO3. The results indicate that hexagonal Lu1-xScxFeO3 is a suitable alternative magnetic dielectric for use at higher temperatures.
authors.affiliation: Institute of Industrial Science, The University of Tokyo , Meguro-ku, Tokyo 153-8505, Japan.
authors.forename: Atsunobu
authors.initials: A
authors.lastname: Masuno
authors.affiliation: Institute of Industrial Science, The University of Tokyo , Meguro-ku, Tokyo 153-8505, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ishimoto
authors.affiliation: Department of Physical Science, Hiroshima University , Higashi-Hiroshima, Hiroshima 739-8526, Japan.
authors.forename: Chikako
authors.initials: C
authors.lastname: Moriyoshi
authors.affiliation: Materials & Structures Laboratory, Tokyo Institute of Technology , Midori-ku, Yokohama 226-8503, Japan.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kawaji
authors.affiliation: Department of Physical Science, Hiroshima University , Higashi-Hiroshima, Hiroshima 739-8526, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kuroiwa
authors.affiliation: Institute of Industrial Science, The University of Tokyo , Meguro-ku, Tokyo 153-8505, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Inoue