Cu₅In₃‐Cu₃In₂ Revisited

Abstract

The η-phase field of the Cu-In system is unusually rich and shows wealth of phases that are all related to the B8 (NiAs/Ni2In) type. Previous electron diffraction work has revealed extensive super structure ordering; in this study, we report single crystal diffraction experiments on high-quality samples of two of the phases in the system, ht1-Cu 5 In 3 and ht2-Cu 5 In 3 . Both these phases constitute super structures, caused by the ordering of interstitials. The structure ht2-Cu 5 In 3 is a relatively simple structure with a bidimensional modulation but where only first order satellites are visible, indicating incomplete order whereas ht1-Cu 5 In 3 displays many high order satel- [a]

Steering the methanol steam reforming reactivity of intermetallic Cu–In compounds by redox activation: stability vs. formation of an intermetallic compound–oxide interface

“…Firstly, the most intense reflections of the three investigated phases as well as other intermetallic compounds e.g. Cu 1.535 In, 42 θ (λ = 0.7093 Å), including the alloy Cu0.9In0.1. 45 The latter exhibits the same space group as metallic Cu and the incorporation of indium leads to lattice expansion, shifting the most intense reflection to 2θ ≈ 19.1°(λ = 0.7093 Å).…”

Crystal structure of incommensurate ηʺ-Cu1.235Sn intermetallic

“…The occurrences of such disturbances in the modulated Cu(2) distribution originate from the deviations from q 3 / q 1 = 2. These dipoles, on a larger spatial scale can be conceived to form boundaries between more well-ordered regions, and thereby resemble (albeit being geometrically different) domain boundaries showing up in approximant structures of incommensurate Ni 2 In/NiAs type Cu 1+δ In phase with δ > 0.5 [25]. It has to be emphasized that the diffraction data available here and the refinement unlikely contain significant information about the exact way in which the deviations from the ideal structural model are realized on a local level, in particular at the dislocations dipoles in Figure 6.…”