The hafnium-iridium system

New Ablation-Resistant Material Candidate for Hypersonic Applications: Synthesis, Composition, and Oxidation Resistance of HfIr3-Based Solid Solution

“…The analysis of the XRD patterns detected that several phases are present, namely, HfIr 3 intermetallics, HfC, and iridium. No intermetallic compounds other than HfIr 3 are formed, despite the fact that there is a set of hafnium–iridium intermetallics in the Hf–Ir system. , The first features of the appearance of the HfIr 3 phase become noticeable at 1100 °C (Figure a). According to the quantitative X-ray analysis, the yield of HfIr 3 at this temperature is about 3% (wt).…”

“…Survey XRD patterns of the HfC–Ir = 1:1 mixture depending on the temperature and selected regions of the XRD patterns: inset (a) appearance of the strongest 111 peak of HfIr 3 and inset (b) splitting of the (331) peak of the HfIr 3± x phase because of the formation of the solid solutions. The dashed line marks the peak position of stoichiometric HfIr 3 after Copeland; inset (c) selected region of the XRD pattern showing the unchangeable position of the Kα1 and Kα2 doublet for the (222) peak belonging to the HfC phase with temperature and a shift of the Kα1 and Kα2 doublet for the (220) peak belonging to the Ir phase with temperature.…”

“…The authors mentioned that they calculated the homogeneity boundaries relying on the data of local X-ray spectroscopy, but unfortunately, no experimental lines of evidence were presented in their work. Earlier, Copeland et al 38 proposed that the homogeneity range can extend from stoichiometric to iridium-rich compositions beyond the stoichiometric composition (76.37 wt or 75 at. % Ir) at least to 78 (wt %).…”

Pharmaceutical Applications of Solid Dispersion Systems

“…The DTA method was used extensively to construct phase diagrams of a number of binary systems (51,52,86,(98)(99)(100)(101)(102)(103)(104)(105)(106)(107)(108)(109)(110). The correlation of DTA data with most frequently encountered phase diagrams is shown in Figs.…”

New hard ternary Hf–Ir–B borides formed by reaction hafnium diboride with iridium

“…According to phase equilibria in the binary Ir-B, Hf-B, and Hf-Ir systems, no liquids are formed at temperatures up to 1200 • С. [17][18][19] Hence, the solid-state reaction between HfB 2 and Ir occurs in 1000-1200…”