Refinement of the Fe₄Al₁₃ structure and its relationship to the quasihomological homeotypical structures

Abstract

The crystal structure of Fe

The Microstructure of Annealed Galfan Coating on Steel Substrate

“…X-ray diffraction patterns obtained with use of two independent instruments (JEOL JDX-7S -Cu Kα 1 radiation, Philips X-PERT -Cu Kα 1 radiation) for non-treated and annealed samples (Figures 5a and 5b respectively) show however only the presence of an eutectic zinc alloy and a steel substrate but neither the orthorhombic Fe 2 Al 5 Zn x nor the monoclinic FeAl 3 Zn x (Fe 4 Al 13 Zn x ) have been revealed (see the respective reference patterns in Figure 5c simulated upon the data from references [4] and [12]). Since the transition layer thickness is low (below 1 µm) and consequently its volume is much lower than the alloy coating volume, X-ray diffraction peaks corresponding to the interface components should have low intensities.…”

“…It can be interesting to quote some figures concerning zinc solubility in the Fe-Al intermetallics. They vary from 21 wt.% [7] to 22.87 wt.% [11] for the orthorhombic Fe 2 Al 5 phase and achieve 13.92 wt.% for the monoclinic FeAl 3 (Fe 4 Al 13 ) phase [12]. It could be interesting to illustrate a microstructure evolution of the Galfan coating subjected to the heat treatment in air (600 • C/5 min.)…”

The Al-Rich Part of the Fe-Al Phase Diagram

“…1 It should be mentioned that the phase Fe 4 Al 13 originally was denoted as FeAl 3 in the old literature, even though already in 1955 Black [10] found that the true composition corresponds to a formula Fe 4 Al 13 . Only since Grin et al [9] published their structure refinement of this phase in 1994, the formula Fe 4 Al 13 is generally accepted in the literature. [15] to 1166°C.…”

Crystal structures of cobalt aluminum silicide, Co19+xAl43+ySi12-y (x = -0.14, y = 0.14; x = 0.49, y = -0.49), the ϒ phase in the Co-Al-Si system

“…It adopts an own structure type with no obvious structural relations to the adjacent phases in the binary system [2][3][4][5][6]. Important common structural motifs of these compounds, like the existence of condensed pentagonal prismatic channels [7] or the existence of a ²cluster² formed by two trigonal prisms around cobalt and a distorted rectangular prism around aluminum [8] are not found in the title compound. One possibility to visualize the complex structure of the g phase is based on the coordination of Co atoms.…”