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

Journal Article · Tue Jun 01 00:00:00 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 Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 991983
• Report Number(s): PNNL-SA-70035; JPSODZ; 30406; EB4202000; TRN: US201021%%366
• Journal Information: Journal of Power Sources, 195(11):3645-3648, Vol. 195, Issue 11; ISSN 0378-7753
• Country of Publication: United States
• Language: English

Related Subjects

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