Dehydrogenation reaction of Li–Mg–N–H systems studied by in situ synchrotron powder X-ray diffraction and powder neutron diffraction

Synthesis and crystal structure of a novel nitride hydride Sr2LiNH2

“…In order to improve the thermodynamic properties of binary Li-N-H system, Li was compositionally substituted by other elements, and several types of ternary or multinary metal-N-H systems (e.g. Li-Mg-N-H [5][6][7][8][9], Li-Ca-N-H [10,11], Li-Al-N-H [12][13][14], Li-B-N-H [12,15], Li-Co-N-H [16] and Li-Mg-Al-N-H [17,18]) were developed.…”

“…One is investigating the hydrogen absorption/desorption property [1][2][3][4][5][8][9][10][11][12][13][14][15][16][17][18]; the other is revealing the reaction mechanism involved in the hydrogen absorption/desorption processes [1,6,7,[14][15][16]21]. It was reported that the new ternary imides with mixed alkali and alkaline earth cations, Li 2 Mg(NH) 2 and Li 2 Ca(NH) 2 , were formed along with the dehydrogenation reaction in the Li-Mg-N-H and Li-Ca-N-H systems, respectively [5,8,11,[19][20][21].…”

Hydrogen Storage Properties of the Mg(NH<SUB>3</SUB>)<SUB>6</SUB>Cl<SUB>2</SUB>-LiH Combined System

“…After dehydrogenated at 310 C, the LiCl phase seems unchanged and the newly developed Li 2 Mg(NH) 2 phase persists. Moreover, no deviation was found for the peak position of Li 2 Mg(NH) 2 with respect to the dehydrogenated sample at 180 C, implying that no further reaction occurs for Li 2 Mg(NH) 2 as the temperature was elevated from 180 to 310 C although Nakamura et al reported previously that it possibly reacted with LiH to release more hydrogen at above 200 C. 36) The peak intensity of the LiH phase is obviously weakened with the disappearance of the LiNH 2 phase, indicating the consumption of LiNH 2 and LiH. Correspondingly, Li 2 NH can be identified from the peaks at 30.1 , 35.0 , 50.3 and 59.9 (2).…”

Evaluation of the enthalpy change due to hydrogen desorption for M–N–H (M = Li, Mg, Ca) systems by differential scanning calorimetry

“…It is observed that single phase 4Li 2 NH$Mg 3 N 2 (Li 2.7 MgN 2 H 1.3 ) is formed below 200 C under vacuum conditions (eq. (7)) [23,37], which should be separated above 200 C (eq. (8)) [35].…”