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First-order phase transition in the Li2B12H12 system

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Open access
Authors
Paskevicius, Mark
Pitt, M.
Brown, David
Sheppard, Drew
Chumphongphan, Somwan
Buckley, Craig
Date
2013
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Type
Journal Article
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Abstract

The thermal decomposition of anhydrous Pa[3 with combining macron] Li2B12H12 was studied in situ by high resolution synchrotron X-ray diffraction. A first-order phase transition can be observed at 355 °C where the unit cell volume expands by ca. 8.7%. The expanded β-Li2B12H12 polymorph simultaneously decomposes to a hydrogen poor γ-Li2B12H12−x phase. Expansion of the unit cell across the discontinuity is consistent with reorientational motion of B12H122− anions, and the presence of a frustrated Li+ lattice indicating Li ion conduction.

Citation
Paskevicius, Mark and Pitt, Mark P. and Brown, David H. and Sheppard, Drew A. and Chumphongphan, Somwan and Buckley, Craig E. 2013. First-order phase transition in the Li2B12H12 system. Physical Chemistry Chemical Physics. 15 (38): pp. 15825-15828.
Source Title
Physical Chemistry Chemical Physics
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