Accelerating discovery and design of high-performance solid-state electrolytes: a machine learning approach.

Solid-state batteries (SSBs) have the potential to fulfil the increasing global energy requirement, outperforming their liquid electrolyte counterparts. However, the progress in SSB development is hindered by the conventional approach of screening solid-state electrolytes (SSEs), which relies on human knowledge, introducing biases and requiring a time-consuming, resource-intensive trial-and-error process. As a result, a wide range of promising Li-containing structures remain unexplored.

Temperature induced phase transformation in Co.

Temperature dependent phase transformation behavior in cobalt from hexagonal close-packed (hcp) to face centered cubic (fcc) has been found to be contradictory to that reported earlier. It is found that hcp phase stabilizes at both low and high temperature ([Formula: see text]873 K) while fcc phase is stabilized at [Formula: see text]500 K. At 298 K, hcp Co has been found to be predominant ([Formula: see text]70%) where hcp magnetic phase is [Formula: see text]60%.

Probing the solute-drag effect and its role in stabilizing the orthorhombic phase in bulk La-doped HfO by X-ray and gamma ray spectroscopy.

The recent observation of ferroelectricity in ultra thin films of hafnium oxide (HfO2) has been attributed to the orthorhombic (o) phase of HfO2 with space group Pca21. Although this oxide is polymorphic in nature, this polar o-phase is known to be stabilized in the doped thin film oxide. The objective of the present experiment is to stabilize the o-phases in La doped bulk polycrystalline HfO2 and investigate their evolution with the doping concentration through Time Differential Perturbed Angular Correlation (TDPAC), X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) measurements.

Martensitic phase transformation in TiNi.

From temperature dependent perturbed angular correlation (PAC) measurements (77-873 K) in equiatomic TiNi intermetallic alloy, martensitic phase transformations have been observed. Three frequency components corresponding to three different phases of TiNi have been found in the temperature range 298-873 K. The results of quadrupole frequency and asymmetry parameters at room temperature are found to be: ω = 14(1) Mrad/s, η = 0 (33%), ω = 40.