Direct observation of ion exchange in mechanically activated LiH+MgB2 system using ultrahigh field nuclear magnetic resonance spectroscopy

Abstract

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Nanostructure-induced hydrogenation of layered compound MgB2

“…4. A centerband peak that can be attributed to MgB 2 was clearly observed at 100.5 ppm [21]. In addition, peaks corresponding to MgB 12 H 12 and Mg(BH 4 ) 2 were also detected at −14.1 and −40.0 ppm [16], respectively.…”

“…That is, hydrogenation reaction of MgB 2 only occurred in grain boundary defects in both milling and the subsequent high pressure hydrogenation processes under the present experimental conditions. Nanostructures with grain boundary defects are expected to possess the advantages to offer abundant nucleation sites for Mg(BH 4 ) 2 and to provide fast diffusion (migration) paths [21] for Mg, B and H atoms, thus promote the formation of Mg(BH 4 ) 2 .…”

Ab Initio Computational Studies of Mg Vacancy Diffusion in Doped MgB2 Aimed at Hydriding Kinetics Enhancement of the LiBH4 + MgH2 System

“…The studies mentioned above [27][28][29][30] unequivocally show that further reduction in the hydriding temperature of the LiBH 4 + MgH 2 system can be achieved by (i) reducing particle sizes to minimize the diffusion distance, (ii) increasing diffusion coefficients via doping in MgB 2 , and (iii) enhancing diffusion * To whom correspondence should be addressed. E-mail: leon.shaw@ uconn.edu.…”

Recent Progress in Metal Borohydrides for Hydrogen Storage

“…By contrast, in MgB 2 , each boron atom is connected to a maximum of three other boron atoms. The recent activities of the above-mentioned metal boride systems [136,[186][187][188][189][190][191][192] are summarized in Table 4. …”