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ID 28860
file
creator
Hino, Satoshi
subject
Hydrogen storage materials
Pressure-composition isotherms
Gas-solid reactions
Van't Hoff plot
Heat of formation
NDC
Chemistry
abstract
Thermodynamic properties of Mg(NH2)(2) and LiNH2 were investigated by measurements of NH3 pressure-composition isotherms (PCI). Van't Hoff plot of plateau pressures of PCI for decomposition of Mg(NH2)(2) indicated the standard enthalpy and entropy change of the reactions were Delta H degrees = (120 +/- 11) kJ . mol(-1) (per unit amount of NH3) and Delta S degrees= (182 +/- 19) J . mol(-1) . K-1 for the reaction: Mg(NH2)(2) -> MgNH +NH3, and Delta H degrees= 112 kJ . mol(-1) and Delta S degrees = 157 J . mol(-1) K-1 for the reaction: MgNH -> (1/3)Mg3N2 + (1/3)NH3. PCI measurements for formation of LiNH2 were carried out, and temperature dependence of plateau pressures indicated Delta H degrees = (-108 +/- 15) kJ . mol(-1) and Delta S degrees = (-143 +/- 25) J. mol(-1) . K-1 for the reaction: Li2NH + NH3 -> 2LiNH(2).
journal title
Journal of Chemical Thermodynamics
volume
Volume 42
issue
Issue 1
start page
140
end page
143
date of issued
2010-01
publisher
Academic Press LTD
Elsevier Science LTD
issn
0021-9614
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2009 Elsevier Ltd.
relation url
department
Institute for Advanced Materials Research