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Title: Li{sub 4}FeH{sub 6}: Iron-containing complex hydride with high gravimetric hydrogen density

Li{sub 4}FeH{sub 6}, which has the highest gravimetric hydrogen density of iron-containing complex hydrides reported so far, is synthesized by hydrogenation of a powder mixture of iron and LiH above 6.1 GPa at 900 °C. In situ synchrotron radiation X-ray diffraction measurements reveal that while kinetics require high temperature and thus high pressure for the synthesis, Li{sub 4}FeH{sub 6} is expected to be thermodynamically stable slightly below room temperature at ambient pressure; further synthetic studies to suppress the kinetic effects may enable us to synthesize Li{sub 4}FeH{sub 6} at moderate pressures. Li{sub 4}FeH{sub 6} can be recovered at ambient conditions where Li{sub 4}FeH{sub 6} is metastable.
Authors:
 [1] ; ; ;  [2] ;  [3] ;  [4] ;  [2] ;  [5]
  1. Quantum Beam Science Center, Japan Atomic Energy Agency, Hyogo 679-5148 (Japan)
  2. Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
  3. WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
  4. Renewable Energy Research Center, National Institute of Advanced Industrial Science and Technology, Fukushima 963-0215 (Japan)
  5. (Japan)
Publication Date:
OSTI Identifier:
22304484
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 2; Journal Issue: 7; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; DENSITY; HYDROGEN; IRON; LITHIUM HYDRIDES; MIXTURES; POWDERS; SYNCHROTRON RADIATION; SYNTHESIS; TEMPERATURE RANGE 0400-1000 K; X-RAY DIFFRACTION