Characterization of a new Nb–silicide (δ-Nb₁₁Si₄) in Nb–Si binary systems

Microstructure and mechanical properties of oxidation resistant suction cast Nb–Si–Al alloy

“…al. [32] was the first who claimed that these precipitates belong to a new phase d-Nb 11 Si 4 . This phase has a body-centered orthorhombic crystal structure.…”

Silicide characterization at alumina–niobium interfaces

“…A body-centered orthorhombic Nb 11 Si 4 [21] phase has recently been reported to form as a precipitate in Nb-Si solid solutions. The tetragonal Nb 5 Cu 4 Si 4 phase has been reported in both phase-equilibria studies [25] and thin-film reaction couples [23] processed at temperatures lower than the bonding temperature used in the present work.…”

“…In thin-film studies [17][18][19][20][21], various stable and metastable silicide phases and phase-formation sequences have been found, depending on deposition conditions and subsequent annealing conditions. The silicides found include NbSi 2 [17,18], Nb 5 Si 3 [17][18][19], Nb 3 Si [17][18][19][20], amorphous Nb silicides of varying composition [17,18], and a body-centered orthorhombic Nb 11 Si 4 phase [21]. In thin-film (and other periodic) systems, interpretation can be difficult due to limited amounts of one or more components, phases forming sequentially rather than simultaneously, and the effects of interfaces on growth and diffusion [22].…”

Effect of Mg addition on microstructural, mechanical and environmental properties of Nb–Si eutectic composite

“…Although fine scale precipitates in the primary Nb were noticed earlier in Nb-Nb 3 Si composites [20], it is only recently that Chen et al [21] have established it to be a new metastable phase. This phase (d) has an orthorhombic crystal structure with lattice parameters of a ¼9.15Å, b¼ 15.43Å and c ¼3.35Å and composition of Nb 11 Si 4 .…”

“…These can be indexed in terms of three variants of the recently discovered d-Nb 11 Si 4 phase ( Fig. 3(a)) [20][21][22] having an orthorhombic crystal structure (a¼9.15Å, b¼15.43Å and c¼3.35Å) with an orientation relation of…”