In the present work we focus on the 2LiNH2 + KBH4 + LiH system: the phase-structural transformations occurring during the desorption process on the powder mixt. are described by in situ synchrotron radiation powder X-ray diffraction (SR-PXD), high-pressure differential scanning calorimetry and manometric measurements. It is obsd. that LiNH2 transforms into Li2NH during heating, at about 160 °C, while the reflections related to KBH4 disappeared at 380 °C. At higher temp., the formation of Li3BN2 is detected, together with an evident increase of the background, ascribable to the presence of a further phase in the molten state. Patterns at room temp., after cooling down the sample, confirm the presence of Li3BN2 and KH as reported in the theor. study. For the as prepd. mixt. it is possible to achieve the theor. hydrogen gravimetric capacity of 7.4 wt%.
In situ synchrotron radiation powder X-ray diffraction study of the 2LiNH2 + LiH + KBH4 system
MILANESE, CHIARA;
2013-01-01
Abstract
In the present work we focus on the 2LiNH2 + KBH4 + LiH system: the phase-structural transformations occurring during the desorption process on the powder mixt. are described by in situ synchrotron radiation powder X-ray diffraction (SR-PXD), high-pressure differential scanning calorimetry and manometric measurements. It is obsd. that LiNH2 transforms into Li2NH during heating, at about 160 °C, while the reflections related to KBH4 disappeared at 380 °C. At higher temp., the formation of Li3BN2 is detected, together with an evident increase of the background, ascribable to the presence of a further phase in the molten state. Patterns at room temp., after cooling down the sample, confirm the presence of Li3BN2 and KH as reported in the theor. study. For the as prepd. mixt. it is possible to achieve the theor. hydrogen gravimetric capacity of 7.4 wt%.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
