Tetrapyridinesilver(I) perrhenate [Agpy4]ReO4 was synthesized, and its crystal structure Raman spectra were elucidated at low temperatures. The lattice is constructed from isolated tetrahedral cations anions having no argentophilic interactions. Weak hydrogen bonds are formed between the oxygens of disordered ortho-hydrogens pyridine ligands. No parallel ?…? stacking interactions observed, but ...

Stacking fault energy (SFE) plays an important role in deformation mechanisms and mechanical properties of face-centered cubic (fcc) metals alloys. In many concentrated fcc alloys, the SFEs determined from density functional theory (DFT) calculations experimental methods are found having opposite signs. Here, we show that negative SFE by DFT reflects thermodynamic instability phase relative to ...

Phase transformation is an effective means to increase the ductility of a material. However, even for commonly observed face-centered-cubic hexagonal-close-packed (fcc-to-hcp) phase transformation, underlying mechanisms are far from being settled. In fact, different pathways have been proposed, especially with regard nucleation hcp at nanoscale. CrCoNi, so-called medium-entropy alloy, fcc-to-hc...