Nanostructuring of Strontium Hexaboride via Lithiation

Abstract

We describe the top-down nanostructuring of a metal boride using SrB as an example. To accomplish this transformation, we demonstrate (1) the direct lithiation of a metal boride using n-butyllithium and then (2) the reactive disassembly of Li-SrB into nanoparticles using water. The identity of the Li-SrB intermediate, a mixture of LiB, LiSrB, and SrB phases, was established by powder X-ray diffraction (PXRD), solid-state B andLi NMR, transmission electron microscopy, selected-area electron diffraction, and scanning electron microscopy. The necessary 2Li/Sr substitution is enabled by cation mobility within the hexaboride lattice. The subsequent reaction with water results in LiB decomposition and the release of <100 nm SrB nanoparticles, which were characterized by PXRD, solid-state B andLi NMR, and high-resolution TEM. This chemistry opens new solution-based modification and processing options for metal borides.

Sintering Mechanism, Microstructure Evolution, and Mechanical Properties of Ti-Added Mo2FeB2-Based Cermets

“…Thus, Ti may be a new doped element which can replace partial Mo atoms. The Mo 2 FeB 2 hard phase shows a structure of U 3 Si 2 and belongs to a tetragonal system [27][28][29]. Considering the strong bonding existing within Mo 2 FeB 2 that contributes to its incredible properties [28][29][30][31], the substitution of atoms may have an important effect on the performance of cermets.…”

Sonochemical Synthesis of Small Boron Oxide Nanoparticles

“…Considering that 10 B-enriched boron oxide is already being produced on the industrial scale for nuclear applications, these results provide a scalable and efficient entry towards an expanded toolbox of boron-rich hybrid nanomaterials. 49–52…”

Facile synthesis of aqueous-dispersed luminescent nanosheets from non-layered lanthanum hexaboride

“…12,[17][18][19][20] In contrast to layered materials, non-layered materials generally have an intrinsic, three-dimensional bonding network formed by covalent bonds; hence were considered as difficult to realize through simple exfoliation techniques. 12,21 If 2D-nanosheets are realized from non-layered bulk materials, the surface of the nanosheets will be rich in unsaturated dangling bonds, thus representing a highly active surface, for applications in energy storage and photodetectors. 11,12 Also, the dangling bonds on the surface and intrinsic crystal distortion may render them with unique optical traits, in comparison to their bulk counterparts.…”

“…Also, synthesis method follows a lengthy procedure taking nearly a couple of weeks' time. 21,22 Lanthanum hexaboride (LaB 6 ) is a non-layered metal hexaboride, which is mainly used in electron emission sources because of its low work function, high thermal stability, and resistance against oxidation, hydrolysis, and acid environments. Despite many useful properties, new applications of this refractory material are constrained by the challenges in processing the material.…”

“…The nanostructuring of the material would enable the use of the material for the fabrication of nanodevices, using solution-based techniques such as spray coating, ink jet printing etc. 21 LaB 6 possesses cubic crystal structure with metal ions and boron octahedra in the cubic sites. [23][24][25] Here we report the delamination of LaB 6 , through simple, solution-based method incorporating probe sonication and shear force grinding.…”