Abstract

A spinel-derived phase (osp) found at the grain boundary of spinel and zirconia in sintered (1500 °C, 10 h) zirconia with 5mol.% Y 2 O 3 and 4.6 mol.% Ni 2 AlTi additives was characterized by transmission electron microscopy. The selected area diffraction patterns taken from a variant of the osp phase indicated that it can be indexed as an orthorhombic lattice with the lattice parameters a = 0.57 nm, b = 1.14 nm, c = 0.80 nm, or their integer multiples. this osp phase developed along the habit plane {110} of spinel, forming ledge-bearing and dislocation-bearing interfaces. The crystallographic relationships between osp and spinel (sp) are [100] osp ∥[110] so , [010] osp ∥[ 1 10] sp and [001] osp ∥[001] sp . Within the osp variant, anti-phase domain boundary was observed.

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