In situ synchrotron radiation powder X-ray diffraction study of the 2LiNH2 + LiH + KBH4 system

JOURNAL OF ALLOYS AND COMPOUNDS

卷:580

Article

Sale, Maddalena^1,2  Pistidda, Claudio³  Taras, Alessandro^1,2  Napolitano, Emilio^1,2  Milanese, Chiara^4,5  Karimi, Fahim³  Dornheim, Martin³  Garroni, Sebastiano^1,2  Enzo, Stefano^1,2  Mulas, Gabriele^1,2 

[1] Univ Sassari, Dept Chem & Pharm, I-07100 Sassari, Italy

[2] INSTM, I-07100 Sassari, Italy

[3] Helmholtz Zentrum Geesthacht, Inst Mat Res, D-21502 Geesthacht, Germany

[4] Univ Pavia, CSGI, Pavia Lab H2, I-27100 Pavia, Italy

[5] Univ Pavia, Dipartimento Chim, Sez Chim Fis, I-27100 Pavia, Italy

关键词: Hydrogen storage in solid state;    Complex hydrides;    In situ synchrotron radiation powder x-ray diffraction (SR-PXD);    Lithium amide;    Lithium hydride;   

DOI  :  10.1016/j.jallcom.2013.02.175

来源: Elsevier

【 摘 要 】

In the present work we focus on the 2LiNH(2) + KBH4 + LiH system: the phase-structural transformations occurring during the desorption process on the powder mixture are described by in situ synchrotron radiation powder X-ray diffraction (SR-PXD), high-pressure differential scanning calorimetry and manometric measurements. It is observed that LiNH2 transforms into Li2NH during heating, at about 160 degrees C, while the reflections related to KBH4 disappeared at 380 degrees C. At higher temperature, 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 temperature, after cooling down the sample, confirm the presence of Li3BN2 and KH as reported in the theoretical study. For the as prepared mixture it is possible to achieve the theoretical hydrogen gravimetric capacity of 7.4 wt%. (C) 2013 Elsevier B.V. All rights reserved.

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