Kristallstruktur von AuCd3

Structural phase transitions of sodium nitride at high pressure

“…28͒ but also in a number of intermetallic phases. [29][30][31][32][33][34] Another possibility with the same metric is the trigonal antitysonite-type structure ͑space group P3c1, Z =6͒ typical for fluorides of rare-earth metals with large cations such as LaF 3 . 35,36 That structure was also initially considered for Na 3 As.…”

Incommensurately Modulated δ″-Au1+xCd2–xFormed by an Unquenchable Phase Transformation from the γ-Brass δ′-Phase

“…The loaded compositions for different preparation, the corresponding refined compositions from single crystal X-ray diffraction experiments, and EDS analyses for selected crystalline specimens can be found in the Supporting Information. The sample with nominal composition x Au = 0.29 exclusively form Cu 3 P-type binary adjacent ε-AuCd 3 (space group P 6 3 cm (185), a = 8.163(1) Å, c = 8.552(2) Å) as observed by EDS analysis and X-ray diffraction experiments. Specimen with x Au = 0.37 shows the existence of W 5 Si 3 type Au 3 Cd 5 (space group = I 4/ mcm (140), a = 10.745(1) Å, c = 5.357(7) Å).…”

“…Gold–cadmium alloys have been found to be used as Shape Memory Alloys (SMA). − The shape memory effect (SMA) in the Au–Cd alloys is caused by the martensitic transformation and its reverse transformation. − Several modifications of martensite structure at low temperature from the β-brass type phase of the Au–Cd alloy have been observed at about 47.5–50 atom percent of cadmium. − The δ-phase field in the Au–Cd system deserves chemical interest because of its allotropic transformations. The δ-phase region of Au–Cd extends from 578 K, the lower stability boundary of δ″ to a maximum temperature of about 833 K for Au rich δ-phase, and the composition ranges from ∼33 to ∼38 atomic percent of gold .…”

Complex structures in the Au – Cd alloy system: Hume-Rothery mechanism as origin

“…At the alloy composition AuCd 3 (z = 1.75), a phase has been found with the structure hP24 [34]. This structure resembles the CuZn 3 -hP3 phase known as high-temperature phase in the Cu-Zn alloys at the same valence electron concentration z =1.75 [4].…”

“…3.1.3. Long-period superlattice Au 2 Cd-hP98 (29)(30)(31)(32)(33)(34) Along with hcp-based superlattices that have long period in c dimension such as in hP4, there are also several phases with long periods in a dimension. We consider the phase that is formed at 29 -34 at% Cd and described in Refs.…”