Single crystals of the new arsenide Eu4Ir8As7 were grown from a lead flux. The structure was refined on the basis of single-crystal X-ray diffractometer data: Ca4Ir8P7 type, P21/m, a = 1311.3(1), b = 408.4(1), c = 1360.3(1) pm, β = 98.45(1)◦, wR2 = 0.0640, 1985 F2 values, 95 variables. The iridium and arsenic atoms in the Eu4Ir8As7 structure build up a complex three-dimensional, covalently bond...

Transition metal diboride-based thin films are promising candidates to replace state-of-the-art protective and functional coating materials due their unique properties. Here, we focus on hexagonal WB2-z, showing that the AlB2 structure is stabilized by B vacancies exhibiting its energetic minima at sub-stoichiometric WB1.5. Nanoindentation reveals super-hardness of 0001 oriented α-WB2-z coating...

Transition metal diborides are ceramic materials with potential applications as hard protective thin films and electrical contact materials. We investigate the possibility to obtain age hardening through isostructural clustering, including spinodal decomposition, or ordering-induced precipitation in ternary diboride alloys. By means of first-principles mixing thermodynamics calculations, 45 ter...

To overcome the limited oxidation resistance of emerging class transition metal borides, we suggest within this study novel quaternary diborides, Ti-TM-Si-B2 ± z (TM = Ta, Mo), achieving compromise between excellent and requirements hard coatings. Single-phase AlB2-type structured films (3–5 µm) are sputter-deposited from TiB2/TMSi2 targets. The Ti-Ta-Si-B2 coatings exhibit 36 GPa in hardness, ...

In this study, the production and characterization of open-cell composite metal foam using replica method, also known as polymer impregnation, was investigated. Composite powders were prepared by alloying in a planetary ball mill for 1 hour AA7075 aluminum powder 10% weight B4C powder. Characterization morphology analysis produced performed XRD SEM/EDS analyses. As result analyses, it observed ...

Using spark plasma sintering (SPS), >98.5 % dense boron carbide (B4C) samples were made from commercially available and lab-synthesised powders via a low temperature synthesis (LTS) process. The work showed that the LTS powder can be produced in batches of tens to hundreds grams whilst maintaining high purity material with lower levels residual free carbon (20.6–21.3 wt.% C) than (22.4 C). was ...