The structure and thermal characteristics of aerodynamically levitated samples of yttria-alumina in the liquid, supercooled liquid and solid phases were explored in an extensive series of high energy x-ray diffraction, small angle neutron scattering, and pyrometric cooling measurements. Particular focus was placed on the compound (Y2O3)(x)(Al2O3)(1-x) with x=0.2 for which a liquid-liquid phase transition at a temperature of 1788 K has recently been reported. No structural or thermal signature in support of this metastable phase transition could be found.
Barnes, A. C., Skinner, L. B., Salmon, P. S., Bytchkov, A., Pozdnyakova, I., Farmer, T. O., & Fischer, H. E. (2009). Liquid-liquid phase transition in supercooled yttria-alumina. Physical Review Letters, 103(22), . https://doi.org/10.1103/PhysRevLett.103.225702