Study of Morphological Changes in MgH2 Destabilized LiBH4 Systems Using Computed X-ray Microtomography

Dobbins, Tabbetha; NaraseGowda, Shathabish; Butler, Leslie G.

doi:10.3390/ma5101740

Study of Morphological Changes in MgH2 Destabilized LiBH4 Systems Using Computed X-ray Microtomography

Journal Article · Wed Sep 26 00:00:00 EDT 2012 · Materials

DOI:https://doi.org/10.3390/ma5101740· OSTI ID:1628435

Dobbins, Tabbetha ^[1]; NaraseGowda, Shathabish ^[2]; Butler, Leslie G. ^[3]

Rowan Univ., Glassboro, NJ (United States). Dept. of Physics and Astronomy; DOE/OSTI
Louisiana Tech Univ., Ruston, LA (United States). Inst. for Micromanufacturing. Dept. of Chemical Engineering
Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Chemistry

The objective of this study was to apply three-dimensional x-ray microtomographic imaging to understanding morphologies in the diphasic destabilized hydride system: MgH2 and LiBH4. Each of the single phase hydrides as well as two-phase mixtures at LiBH4:MgH2 ratios of 1:3, 1:1, and 2:1 were prepared by high energy ball milling for 5 minutes (with and without 4 mol % TiCl3 catalyst additions). Samples were imaged using computed microtomography in order to (i) establish measurement conditions leading to maximum absorption contrast between the two phases and (ii) determine interfacial volume. The optimal energy for measurement was determined to be 15 keV (having 18% transmission for the MgH2 phase and above 90% transmission for the LiBH4 phase). This work also focused on the determination of interfacial volume. Results showed that interfacial volume for each of the single phase systems, LiBH4 and MgH2, did not change much with catalysis using 4 mol % TiCl3. However, for the mixed composite system, interphase boundary volume was always higher in the catalyzed system; increasing from 15% to 33% in the 1:3 system, from 11% to 20% in the 1:1 system, and 2% to 14% in the 2:1 system. The parameters studied are expected to govern mass transport (i.e., diffusion) and ultimately lead to microstructure-based improvements on H2 desorption and uptake rates.

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1628435

Journal Information:: Materials, Journal Name: Materials Journal Issue: 10 Vol. 5; ISSN 1996-1944; ISSN MATEG9

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

References (11)

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36 MATERIALS SCIENCE
LiBH4
Materials Science
MgH2
destabilized hydrides
microtomography

Study of Morphological Changes in MgH2 Destabilized LiBH4 Systems Using Computed X-ray Microtomography

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References (11)

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