A database of multi-principal element alloy phase-specific mechanical properties measured with nano-indentation.

Multi-principal element alloys (MPEAs) have been the focus of study and computationally-guided design for two reasons. MPEAs have shown high strengths and, the vast potential compositional space is more efficiently navigated with machine learning. In this article, we present data from 7385 indentation tests performed on 19 different MPEAs.

A Gold(I) Oxide Double Perovskite: BaAuIO.

Oxide perovskites offer improved stability compared to halide perovskite compounds for optoelectronic applications. Here, we report the first gold-containing double perovskite, BaAuIO, and compare it to BaAgIO and BaNaIO. BaAuIO and BaAgIO exhibit a monoclinic distortion from the cubic perovskite structure possessed by BaNaIO and have similar lattice constants despite the nominally larger size of Au compared to Ag.

Twisting of 2D Kagomé Sheets in Layered Intermetallics.

Chemical bonding in 2D layered materials and van der Waals solids is central to understanding and harnessing their unique electronic, magnetic, optical, thermal, and superconducting properties. Here, we report the discovery of spontaneous, bidirectional, bilayer twisting (twist angle ∼4.5°) in the metallic kagomé MgCoGe at = 100(2) K via X-ray diffraction measurements, enabled by the preparation of single crystals by the Laser Bridgman method.

Oxygen-Induced Ordering in Bulk Polycrystalline CuZnSnS by Sn Removal.

Solid-state nuclear magnetic resonance spectroscopy, X-ray diffraction, and Raman spectroscopy were used to show that CuZnSnS (CZTS) bulk solids grown in the presence of oxygen had improved cation ordering compared to bulk solids grown without oxygen. Oxygen was shown to have negligible solubility in the CZTS phase. The addition of oxygen resulted in the formation of SnO, leading to Sn-deficient CZTS.