Visual observation of phase transitions in LiKSO4 under pressure

Phase transitions in LiKSO₄ have been visually observed in a diamond-anvil cell up to 16 GPa. The observations confirm a symmetry change at 0·9 GPa and a solidstate crystal to amorphous transition at 12 GPa. The crystal exhibits a memory across the crystalline transitions. Interesting microstructural features were observed in the range of the amorphous phase.     

Mechanical property characterization in support of elevated temperature reactor design

The mechanical properties data used for the design of nuclear reactors and reactor components for operation at elevated temperatures often show considerable variation. In types 304 and 316 stainless steels, much of the heat-to-heat variation is due to variation in chemical composition and grain size. For a heat-treatable ferritic steel such as 2 1/4 Cr-1 Mo steel, chemical composition is again important, but the heat treatment is more important. An understanding of the metallurgical processes that lead to data variation and property changes in these steels can be used to optimize reactor design.     

Automation of human behaviors and its prediction using machine learning

Microsystem Technologies - Prediction is a method of detecting a person's behavior toward online buying by evaluating publically available evaluations on the web. Understanding expressive human...     

Stability of ceramic matrix materials in molten hydroxide under oxidizing and reducing conditions

The degradation mechanism of ceramic matrix materials used as molten hydroxide electrolyte support for steam electrolysis cells, is not well documented. In this study, we have investigated the structural and chemical stability of non-oxide and oxide ceramics (SiC, YSZ, Li₂ZrO_3, LiAlO₂, and SrZrO₃) in the presence of molten hydroxide under oxidizing and reducing conditions with humidity levels of 3 and 85% at 550 °C. SiC, YSZ, Li₂ZrO₃ and LiAlO₂ showed structural and chemical changes due to dissolution of the ceramic particles in the hydroxide melt followed by precipitation. The SrZrO₃ powder, on the other hand, remained both chemically and structurally stable during 500 h test under both oxidizing and reducing atmospheres. The findings of a stable ceramic matrix in molten hydroxide contribute to the enhancement of the durability and performance of intermediate temperature water electrolysis system.     

Effect of graphene templated fluorides of Ce and La on the de/rehydrogenation behavior of MgH2

The present investigation describes the hydrogen storage properties of MgH₂ ball milled with different additives i.e. graphene templated rare earth metal (La and Ce) fluorides, CeF₄ and LaF₃. MgH₂ ball milled with graphene templated CeF₄ (MgH₂:CeF₄@Gr) has onset desorption temperature of 245 °C, which is 50 °C, 52 °C and 75 °C lower than MgH₂ ball milled with LaF₃ templated graphene, CeF₄ and LaF₃ respectively. CeF₄@Gr also shows the superior effect amongst all additives during rehydrogenation where MgH₂:CeF₄@Gr absorbs 5.50 wt% within 2.50 min at 300 °C under 15 atm H₂ pressure. Dual tuning effect, i.e. lowering of thermodynamic (62.77 kJ/mol H₂: lower from 74 kJ/mol for pristine MgH₂) and kinetics barrier (93.01 kJ/mol) has been observed for MgH₂:CeF₄@Gr. Additionally, MgH₂ ball milled with CeF₄@Gr shows good reversibility up to 24 cycles of de/rehydrogenation. The feasible working mechanism of CeF₄@Gr as additive for MgH₂ has been studied in detail with the help of Transmission Electron Microscope (TEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Diffraction characterizations (XRD).