Wet Mechanochemical Synthesis of BH-Substituted Lithium Argyrodites.

In all-solid-state batteries, a solid electrolyte with high ionic conductivity is required for fast charging, uniform lithium deposition, and increased cathode capacity. Lithium argyrodite with BH substitution has promising potential due to its higher ionic conductivity compared to argyrodites substituted with halides. In this study, LiPS(BH), characterized by a high ionic conductivity of 13.

Identification of a Ternary Nitride TiCuN with a Unique Structure Type.

This study presents the synthesis and detailed structural analysis of the ternary nitride TiCuN. Initially identified as TiCuN within the Ti-Cu-N ternary phase diagram, its crystal structure remained unresolved and was characterized solely as belonging to the tetragonal crystal system. Through a comprehensive structural analysis, this study proposes a revised stoichiometry as TiCuN; its crystal structure represents a previously unreported structure type within the space group.

Borohydride and halide dual-substituted lithium argyrodites.

Solid electrolyte is a crucial component of all-solid-state batteries, with sulphide solid electrolytes such as lithium argyrodite being closest to commercialization due to their high ionic conductivity and formability. In this study, borohydride/halide dual-substituted argyrodite-type electrolytes, LiPS(BH)X (X = Cl, Br, I; + ≤ 1.8), have been synthesized using a two-step ball-milling method without post-annealing.

Lithium Superionic Conduction in BH -Substituted Thiophosphate Solid Electrolytes.

Compared with conventional liquid electrolytes, solid electrolytes can better improve the safety properties and achieve high-energy-density Li-ion batteries. Sulfide-based solid electrolytes have attracted significant attention owing to their high ionic conductivities, which are comparable to those of their liquid counterparts. Among them, Li thiophosphates, including Li-argyrodites, are widely studied.

Design of V-Substituted TiFe-Based Alloy for Target Pressure Range and Easy Activation.

Titanium iron (TiFe) alloy is a room-temperature hydrogen-storage material, and it absorbs hydrogen via a two-step process to form TiFeH and then TiFeH. The effect of V addition in TiFe alloy was recently elucidated. The V substitution for Ti sublattice lowers / ratio, where and are the equilibrium plateau pressure for TiFe/TiFeH and TiFeH/TiFeH, respectively, and thus restricts the two-step hydrogenation within a narrow pressure range.

Ammonium-Ammonia Complexes, NH, in Ammonium -Borate Ammines: Synthesis, Structure, and Properties.

Metal -borates have recently received significant attention due to their potential applications as solid-state ionic conductors. Here, the synthesis, crystal structures, and properties of (NH)BH·NH ( = /, 1 (α and β)) and (NH)BH·NH ( = 1 and 2) are reported. synchrotron radiation powder X-ray diffraction allows for the investigation of structural changes as a function of temperature.

Structural Diversity and Trends in Properties of an Array of Hydrogen-Rich Ammonium Metal Borohydrides.

Metal borohydrides are a fascinating and continuously expanding class of materials, showing promising applications within many different fields of research. This study presents 17 derivatives of the hydrogen-rich ammonium borohydride, NHBH, which all exhibit high gravimetric hydrogen densities (>9.2 wt % of H).

Ammine Lanthanum and Cerium Borohydrides, (BH)·NH; Trends in Synthesis, Structures, and Thermal Properties.

Ammine metal borohydrides show potential for solid-state hydrogen storage and can be tailored toward hydrogen release at low temperatures. Here, we report the synthesis and structural characterization of seven new ammine metal borohydrides, (BH)·NH, M = La ( = 6, 4, or 3) or Ce ( = 6, 5, 4, or 3). The two compounds with = 6 are isostructural and have new orthorhombic structure types (space group 222) built from cationic complexes, [(NH)(BH)], and are charge balanced by BH.

The mechanism of Mg conduction in ammine magnesium borohydride promoted by a neutral molecule.

Light weight and cheap electrolytes with fast multi-valent ion conductivity can pave the way for future high-energy density solid-state batteries, beyond the lithium-ion battery. Here we present the mechanism of Mg-ion conductivity of monoammine magnesium borohydride, Mg(BH)·NH. Density functional theory calculations (DFT) reveal that the neutral molecule (NH) in Mg(BH)·NH is exchanged between the lattice and interstitial Mg facilitated by a highly flexible structure, mainly owing to a network of di-hydrogen bonds, N-HH-B and the versatile coordination of the BH ligand.

Ammonia-assisted fast Li-ion conductivity in a new hemiammine lithium borohydride, LiBH·1/2NH.

Hemiammine lithium borohydride, LiBH·1/2NH, is characterized and a new Li conductivity mechanism is identified. It exhibits a Li conductivity of 7 × 10 S cm at 40 °C in the solid state and 3.0 × 10 S cm at 55 °C after melting.

Disorder induced polymorphic transitions in the high hydrogen density compound Sr(BH)(NHBH).

The new compound Sr(BH4)2(NH3BH3)2 has been synthesized and characterized with in situ powder X-ray diffraction and fast (28 or 60 kHz) magic angle spinning 1H, 11B and 15N NMR and structurally optimized with density functional theory calculations. This investigation reveals complex structural rearrangements for this compound as a function of temperature. A room temperature orthorhombic polymorph, α-Sr(BH4)2(NH3BH3)2, with the space group symmetry Pbca, has been determined with a layered structure of alternating ammonia borane and Sr(BH4)2, partially stabilized by dihydrogen bonding.

Interface-enhanced Li ion conduction in a LiBH4-SiO2 solid electrolyte.

We have developed a fast solid state Li ion conductor composed of LiBH4 and SiO2 by means of interface engineering. A composite of LiBH4-SiO2 was simply synthesized by high energy ball-milling, and two types of SiO2 (MCM-41 and fumed silica) having different specific surface areas were used to evaluate the effect of the LiBH4/SiO2 interface on the ionic conductivity enhancement. The ionic conductivity of the ball-milled LiBH4-MCM-41 and LiBH4-fumed silica mixture is as high as 10(-5) S cm(-1) and 10(-4) S cm(-1) at room temperature, respectively.

Ammine Calcium and Strontium Borohydrides: Syntheses, Structures, and Properties.

A new series of solvent- and halide-free ammine strontium metal borohydrides Sr(NH3 )n (BH4 )2 (n=1, 2, and 4) and further investigations of Ca(NH3 )n (BH4 )2 (n=1, 2, 4, and 6) are presented. Crystal structures have been determined by powder XRD and optimized by DFT calculations to evaluate the strength of the dihydrogen bonds. Sr(NH3 )(BH4 )2 (Pbcn) and Sr(NH3 )2 (BH4 )2 (Pnc2) are layered structures, whereas M(NH3 )4 (BH4 )2 (M=Ca and Sr; P21 /c) are molecular structures connected by dihydrogen bonds.

Superficial Esophageal Neoplasms Overlying Leiomyomas Removed by Endoscopic Submucosal Dissection: Case Reports and Review of the Literature.

The coexistence of an epithelial lesion and a subepithelial lesion is uncommon. In almost all such cases, the coexistence of these lesions appears to be incidental. It is also extremely rare to encounter a neoplasm in the surface epithelium that overlies a benign mesenchymal tumor in the esophagus.

Trends in Syntheses, Structures, and Properties for Three Series of Ammine Rare-Earth Metal Borohydrides, M(BH4)3·nNH3 (M = Y, Gd, and Dy).

Fourteen solvent- and halide-free ammine rare-earth metal borohydrides M(BH4)3·nNH3, M = Y, Gd, Dy, n = 7, 6, 5, 4, 2, and 1, have been synthesized by a new approach, and their structures as well as chemical and physical properties are characterized. Extensive series of coordination complexes with systematic variation in the number of ligands are presented, as prepared by combined mechanochemistry, solvent-based methods, solid-gas reactions, and thermal treatment. This new synthesis approach may have a significant impact within inorganic coordination chemistry.

Microstructural characterization of dehydrogenated products of the LiBH4-YH3 composite.

The dehydrogenated microstructure of the lithium borohydride-yttrium hydride (LiBH4-YH3) composite obtained at 350°C under 0.3 MPa of hydrogen and static vacuum was investigated by transmission electron microscopy combined with a focused ion beam technique. The dehydrogenation reaction between LiBH4 and YH3 into LiH and YB4 takes place under 0.

A simple score for predicting mortality in patients with pneumatosis intestinalis.

Background And Aim: This study was conducted to identify simple computerized tomography (CT) and clinical predictors of mortality in patients with pneumatosis intestinalis (PI). Thus, the clinical characteristics and outcomes of PI were assessed and the predictors of mortality were identified.

Methods: The medical records of 123 patients with PI were reviewed retrospectively.

Microstructural analysis of dehydrogenation products of the Ca(BH₄)₂-MgH₂ composite.

The microstructural analysis of the dehydrogenation products of the Ca(BH₄)₂-MgH₂ composite was performed using transmission electron microscopy. It was found that nanocrystalline CaB₆ crystallites formed as a dehydrogenation product throughout the areas where the signals of Ca and Mg were simultaneously detected, in addition to relatively coarse Mg crystallites. The uniform distribution of the nanocrystalline CaB₆ crystallites appears to play a key role in the rehydrogenation of the dehydrogenation products, which implies that microstructure is a crucial factor determining the reversibility of reactive hydride composites.

Is Y2(B12H12)3 the main intermediate in the decomposition process of Y(BH4)3?

Dodecaborates, i.e. the [B12H12](2-) containing species, are often observed as main intermediates in the hydrogen sorption cycle of metal borohydrides, hindering rehydrogenation.

[A case of a perivascular epithelioid cell tumor mimicking colon cancer].

Perivascular epithelioid cell tumor (PEComa) is extremely rare, which originated from mesenchymal cells in the intestine, and composed of histologically and immunohistochemically distinctive perivascular epithelioid cells. We report here on a case of PEComa in the sigmoid colon. A 62-year-old woman presented with hematochzia 10 days ago.

In Situ NMR Study on the Interaction between LiBH4-Ca(BH4)2 and Mesoporous Scaffolds.

We discuss the use of nuclear magnetic resonance (NMR) spectroscopy to investigate the physical state of the eutectic composition of LiBH4-Ca(BH4)2 (LC) infiltrated into mesoporous scaffolds and the interface effect of various scaffolds. Eutectic melting and the melt infiltration of mixed borohydrides were observed through in situ NMR. In situ and ex situ NMR results for LC mixed with mesoporous scaffolds indicate that LiBH4 and Ca(BH4)2 exist as an amorphous mixture inside of the pores after infiltration.

Pressure-enhanced dehydrogenation reaction of the LiBH4-YH3 composite.

The increase in hydrogen back pressure unexpectedly enhances the overall dehydrogenation reaction rate of the 4LiBH(4) + YH(3) composite significantly. Also, argon back pressure has a similar influence on the composite. Gas back pressure seems to enhance the dehydrogenation reaction by kinetically suppressing the formation of the diborane by-product.