The Crystal Structure of AlSiC Revisited.

AlSiC is a ternary wide-band-gap semiconductor with a high strength-to-weight ratio and excellent oxidation resistance. It consists of slabs of AlC separated by SiC layers with the space group of 6. The space group allows Si to occupy two different 2 Wykoff sites, with previous studies reporting that Si occupies only one of the two sites, giving it an ordered structure.

Spin glass states in multicomponent layered perovskites.

Temperature-dependent dc-magnetization and ac-susceptibility curves have been recorded for series of single and double layered Ruddlesden-Popper multicomponent perovskites with chemical formula ABO and ABO, respectively, with (La, Sr) on A-sites and up to 7 different cations on the B-sites (Ti, Cr, Mn, Fe, Co, Ni, Cu). The phase purity and chemical homogeneity of the compounds were investigated by X-ray diffraction and energy dispersive X-ray spectroscopy. Independently of the composition, spin glassiness is observed in both systems.

Fatigue-related risk perception among emergency physicians working extended shifts.

There is a growing body of studies indicating that extended shift duration has an adverse effect on fatigue, consequently leading to reduced work performance and higher risk of accident. Following modern fatigue risk management systems (FRMS), acceptable performance could be maintained by the mobilization of appropriate mitigation strategies. However, the effective deployment of such strategies assume that workers are able to assess their own level of fatigue-related impairments.

Thermal Stability of the HfNbTiVZr High-Entropy Alloy.

The multicomponent alloy HfNbTiVZr has been described as a single-phase high-entropy alloy (HEA) in the literature, although some authors have reported that additional phases can form during annealing. The thermal stability of this alloy has therefore been investigated with a combination of experimental annealing studies and thermodynamic calculations using the CALPHAD approach. The thermodynamic calculations show that a single-phase HEA is stable above about 830 °C.

Fatigue-related risk management in the emergency department: a focus-group study.

Fatigue has major implications on both patient safety and healthcare practitioner's well-being. Traditionally, two approaches can be used to reduce fatigue-related risk: reducing the likelihood of a fatigued operator working (i.e.

AlMB (M = Cr, Mn, Fe, Co, Ni): a group of nanolaminated materials.

Combining theory with experiments, we study the phase stability, elastic properties, electronic structure and hardness of layered ternary borides AlCrB, AlMnB, AlFeB, AlCoB, and AlNiB. We find that the first three borides of this series are stable phases, while AlCoB and AlNiB are metastable. We show that the elasticity increases in the boride series, and predict that AlCrB, AlMnB, and AlFeB are more brittle, while AlCoB and AlNiB are more ductile.

A cubic calcium oxynitrido-silicate, Ca(2.89)Si(2)N(1.76)O(4.24).

The title compound, tricalcium oxynitride silicate, with composition Ca(3-x)Si(2)N(2-2x)O(4+2x) (x ≃ 0.12), is a perovskite-related calcium oxynitrido silicate containing isolated oxynitrido silicate 12-rings. The N atoms are statistically disordered with O atoms (occupancy ratio N:O = 0.

From V8Ga36.9Zn4.1 and Cr8Ga29.8Zn11.2 to Mn8Ga27.4Zn13.6: a remarkable onset of Zn-cluster formation in an intermetallic framework.

The series of isotypic compounds V8Ga41 --> V8Ga36.9Zn4.1 --> Cr8Ga29.

The Hume-Rothery Compound Mn Ga Zn : Separated Zn -Clusters Interspersed in a Primitive Cubic Host Lattice.

Separated Zn cluster entities unexpectedly occur in the solid-state structure of Mn Ga Zn (the central building block is shown). They correspond to centered cuboctahedra, that is, small volumes of face-centered cubic metal. The intriguing segregation of Ga and Zn atoms in Mn Ga Zn was verfied by Rietveld refinement of neutron powder diffraction data.