New complex intermetallic in the Al–Rh–Ru alloy system

A ternary orthorhombic phase (Pbma, a = 2.34, b = 1.62 and c = 2.00 nm) was revealed around the Al77Rh15Ru8 composition. It is structurally related to the Al–Rh and Al–Pd ɛ-phases.

► New intermetallic Al77Rh15Ru8 phase was found in the Al–Rh–Ru system.
► The new phase has an orthorhombic cell with a = 2.34, b = 1.62 and c = 2.00 nm.
► Its crystal symmetry can be described by the Pbma (no. 57) space group.
► The [0 1 0] ED pattern taken from the new phase exhibits pseudo-10fold symmetry.
► Structural relation of the Al77Rh15Ru8 phase to the ɛ-phases is discussed.