Z. Naturforsch. 51 b, 806-810 (1996): received November 9, 1995 Europium Intermetallic Compounds, Crystal Structure EuPdSn and EuPtSn were prepared from the elements in tantalum tubes at 1070 K and in­ vestigated by X-ray diffraction on both powder as well as single crystals. They crystallize with the TiNiSi type structure of space group Pnma and with Z = 4 formula units per cell. Both structur...

To overcome these problems, very effective diffusion barriers need to be developed. These barriers should have a low diffusivity for copper, a high thermal stability, and should lack a driving force for chemical reactions with Cu, silicon or silicides. Unlike aluminum, copper does not form stable intermetallic compounds with the transition metals of the V and Cr groups, and the mutual solid sol...

Metal-semiconductor Janus-like nanoparticles with the composition tantalum silicide-silicon (TaSi₂/Si) were synthesized for the first time by means of an evaporation method utilizing a high-power electron beam. The composition of the synthesized particles were characterized using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), selective area electron diffracti...

A TEM study of pure tantalum and tantalum-tungsten alloys explosively shocked at a peak pressure of 30 GPa is presented. While no omega phase was found in shock-recovered pure Ta and Ta-5W which mainly contain a cellular dislocation structure, a shock-induced omega phase was found in Ta-10W which contains evenly distributed dislocations with a density higher than 1 × 10(12) cm( - 2). The shock-...

The mechanical properties, corrosion resistance and biocompatibility of the titanium-tantalum alloys together with pure titanium are comparatively studied for biomedical applications in this study. The experimental results confirm the previous theoretic investigation that tantalum has a potential to enhance the strength and reduce the elastic modulus of titanium alloys at the same time, and ind...

A microstructural study was conducted on 15 cobalt-chromium-nickel alloys of the basic composition 40 Co-30 Ni-30 Cr. The alloys were strengthened by the addition of tantalum and tantalum-rich regions were found at the interdendritic spaces. The increase in Ta concentration caused a decrease in the concentration of the a phase and an increase in the amounts of the a phase. Excessive amounts of ...

Hafnium oxide mixed tantalum oxide (HTO) and Zirconium oxide mixed tantalum oxide (ZTO) layers were deposited on chemically cleaned p-Si substrate using RF magnetron sputtering technique. The oxide/Si stacks were annealed in oxygen for 30 minutes at 400 °C as on initial investigation. Both composition and structural properties were absolutely interesting to move further for electrical measureme...

Z. Naturforsch. 55 b, 155-161 (2000); received November 10, 1999 Intermetallic Cerium Compounds, Crystal Structure New intermetallic cerium compounds Ce2 7iMg (T = Ni, Cu, Pd), CqiTjCd (T Pd, Pt, Au), and CtiTzPb (T = Pt, Au) were prepared by reaction of the elements in sealed tantalum tubes in a high-frequency furnace. Most C e :^ ^ (X = Mg, Cd, Pb) compounds are stable after annealing at abou...