Overlooked Binary Compounds Uncovered in the Reinspection of the La-Au System: Synthesis, Crystal Structures, and Electronic Properties of La7Au3, La3Au2, and La3Au4

Although compound formation between two elements is well studied, thorough investigations make it possible to uncover new binary compounds. A re-examination of the La-Au system revealed three new phases, which were characterized with respect to their structural and electronic properties as well as thermal stability: La7Au3 (Th7Fe3 type, space group P6(3)mc, Pearson code hP20) appears to be metastable. It can be obtained by slow crystallization from a stoichiometric melt. La3Au2 (U3Si2 type, space group P4/mbm, Pearson code tP10) is stable up to 1013 K, where it decomposes peritectically. La3Au, (Pu3Pd4 type, space group R (3) over bar, Pearson code hR14) is thermally stable up to at least 1273 K. In addition, the crystal structures of La2Au(anti-PbCl2 type, space group Pnma, Pearson code oP12) and alpha-LaAu (FeB type, space group Pnma, Pearson code oP8) could be determined by single-crystal X-ray diffraction. The electronic structures and chemical bonding have been evaluated from first principles calculations. They show that all compounds can be viewed as electron-rich, polar intermetallics.

Automated summary

Re-examination of the La-Au system led to the discovery of three new phases: La7Au3, La3Au2, and La3Au, each exhibiting different levels of thermal stability and structural characteristics. Through various experimental methods and computational techniques, it was revealed that these compounds can be categorized as electron-rich, polar intermetallics.