2018 Volume 59 Issue 3 Pages 469-474
Spherical samples of Tm1−xScxFeO3 were solidified from the undercooled melt under the containerless state using an aerodynamic levitation (ADL) furnace. The change of solidification behavior from double recalescence to single recalescence and powder X-ray diffraction (XRD) analysis of as-solidified samples revealed that metastable hexagonal LnFeO3 (h-LnFeO3) stabilizes with increasing of mole fraction of Sc. The reason for this stabilization was ascribed to the decrease of the difference in the liquidus temperatures of stable orthorhombic LnFeO3 (o-LnFeO3) and metastable h-LnFeO3 phases. Annealing the as-solidified samples at 1473 K for 1 hour resulted in the two-phase coexistent states of o−LnFeO3 and garnet (c-A3B5O12) at 0 < x < 0.3, c-A3B5O12 and h-LnFeO3 at 0.3 < x < 0.5, and h-LnFeO3 and c-ScFeO3 at 0.5 < x < 1.0. Based on these results, we proposed the quasi phase diagram between TmFeO3 and ScFeO3.
This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 81 (2017) 522–526. Table 1 and reference 5 were newly added to make our explanation more clear.
