Detailed Investigation of Ion Exchange in Ball Milled LiH+MgB2 System using Ultra-High Field NMR Spectroscopy

Journal Article · Tue Jun 01 04:00:00 EDT 2010 · Journal of Power Sources, 195(11):3645-3648

DOI:https://doi.org/10.1016/j.jpowsour.2009.12.033· OSTI ID:991983

Hu, Jian Z; Kwak, Ja Hun; Yang, Zhenguo; Wan, Xiufeng; Shaw, Leonard D

The present study with the detailed 1H-6Li cross polarization NMR analysis confirms the formation of a ternary compound, (Mg1-xLi2x)B2, during ball milling of LiH + ½ MgB2 at room temperature. The 6Li sites in (Mg1-xLi2x)B2 exhibit spinning sidebands (SSBs), whereas the 6Li sites in LiH do not. The SSBs and the very short spin-lattice relaxation time manifested by the 6Li sites in (Mg1-xLi2x)B2 indicate that the Li ions in (Mg1-xLi2x)B2 are located between the layered boron structures and close to Mg ions. The formation of (Mg1-xLi2x)B2 explains the previous observation that the LiH + ½ MgB2 mixture ball milled effectively has a greatly enhanced hydriding kinetics at temperatures below the melting point of LiBH4.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 991983
• Report Number(s): PNNL-SA-70035; 30406; EB4202000
• Journal Information: Journal of Power Sources, 195(11):3645-3648, Journal Name: Journal of Power Sources, 195(11):3645-3648 Journal Issue: 11 Vol. 195; ISSN JPSODZ; ISSN 0378-7753
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Environmental Molecular Sciences Laboratory
Hydrogen Storage
ION EXCHANGE
KINETICS
LITHIUM HYDRIDES
Lithium borohydride
MAGNESIUM BORIDES
MILLING
MOLECULAR STRUCTURE
Magnesium diboride
6Li nuclear magnetic resonance
NUCLEAR MAGNETIC RESONANCE
SPIN-LATTICE RELAXATION