Mechanochemical transformations in Li(Na)AlH4-Li(Na)NH2 systems
Creators
- 1. Ames Laboratory of the U.S. DOE, Iowa State University, Ames, IA 50011-3020 (United States)
- 2. Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011-2300 (United States)
- 3. Ames Laboratory of the U.S. DOE, Iowa State University, Ames, IA 50011-3020 (United States) and Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011-2300 (United States)
Description
Mechanochemical transformations of tetrahydroaluminates and amides of lithium and sodium have been investigated using gas volumetric analysis, X-ray powder diffraction, solid-state nuclear magnetic resonance (NMR) and transmission electron microscopy. In a transformation of LiAlH4 and LiNH2 taken in an 1:1 molar ratio, the amount of released hydrogen (6.6 wt.% after 30 min ball milling) was higher than in any known one pot mechanochemical process involving a hydrogen-containing solid. A total of 4.3 wt.% of hydrogen is released by the NaAlH4-NaNH2 system after 60 min ball milling; and 5.2 wt.% H2 is released when LiAlH4 and NaNH2 or NaAlH4 and LiNH2 are ball milled for 90 min and 120 min, respectively. All transformations proceed at room temperature. The mechanism of the overall transformation MAlH4(s) + MNH2(s) → 2MH(s) + AlN(s) + 2H2(g) was identified based on detailed spectroscopic analysis of the intermediate (M3AlH6) and final products of the ball milling process
Additional details
Identifiers
- DOI
- 10.1016/j.actamat.2007.01.016;
- PII
- S1359-6454(07)00069-9;
Publishing Information
- Journal Title
- Acta Materialia
- Journal Volume
- 55
- Journal Issue
- 9
- Journal Page Range
- p. 3121-3130
- ISSN
- 1359-6454
- CODEN
- ACMAFD
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 39034777
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ALUMINIUM HYDRIDES; ALUMINIUM NITRIDES; HYDROGEN; HYDROGEN STORAGE; LITHIUM HYDRIDES; NUCLEAR MAGNETIC RESONANCE; SODIUM HYDRIDES; TEMPERATURE RANGE 0273-0400 K; TRANSMISSION ELECTRON MICROSCOPY; VOLUMETRIC ANALYSIS; X-RAY DIFFRACTION
- Descriptors DEC
- ALKALI METAL COMPOUNDS; ALUMINIUM COMPOUNDS; CHEMICAL ANALYSIS; COHERENT SCATTERING; DIFFRACTION; ELECTRON MICROSCOPY; ELEMENTS; HYDRIDES; HYDROGEN COMPOUNDS; LITHIUM COMPOUNDS; MAGNETIC RESONANCE; MICROSCOPY; NITRIDES; NITROGEN COMPOUNDS; NONMETALS; PNICTIDES; QUANTITATIVE CHEMICAL ANALYSIS; RESONANCE; SCATTERING; SODIUM COMPOUNDS; STORAGE; TEMPERATURE RANGE
Optional Information
- Copyright
- Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.