Vertical Sections of the Al sub(2)O sub(3)-HfO sub(2)-La sub(2)O sub(3)Phase Diagram

For more complete description of the Al sub(2)O sub(3)-HfO sub(2)-La sub(2)O sub(3) phase diagram, three vertical sections are constructed in a wide temperature and composition range. Isopleth 20 mol.% HfO sub(2) (20H) shows the Al sub(2)O sub(3)-HfO sub(2)-La sub(2)O sub(3) constitution in the Al sub(2)O sub(3)-rich region. Isopleth 60 mol.% HfO sub(2) (60H) describes the ternary system in the Al sub(2)O sub(3)- and La sub(2)O sub(3)-rich regions and F T phase transformation of HfO sub(2) solid solutions. The radial La sub(2)O sub(3)-(50 mol.% Al sub(2)O sub(3) . 50 mol.% HfO sub(2)) vertical section reveals the nature of X H A phase transformations of La sub(2)O sub(3) solid solutions. The vertical sections intersect all three triangulating planes of the Al sub(2)O sub(3)-HfO sub(2)-La sub(2)O sub(3) system and demonstrate variation in the width of their two-phase regions.