First-order phase transition in the Li2B12H12 system
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.
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Physical Chemistry Chemical Physics
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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.