First-order phase transition in the Li2B12H12 system

Mark Paskevicius; Mark P. Pitt; David H. Brown; Drew A. Sheppard; Somwan Chumphongphan; Craig E. Buckley

doi:10.1039/C3CP53090F

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First-order phase transition in the Li₂B₁₂H₁₂ system†

Mark Paskevicius,*^a Mark P. Pitt,^a David H. Brown,^b Drew A. Sheppard,^a Somwan Chumphongphan^a and Craig E. Buckley^a

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* Corresponding authors

^a Department of Imaging and Applied Physics, Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth 6845, WA, Australia
E-mail: mark.paskevicius@gmail.com
Fax: +61 8 9266 2377
Tel: +61 8 9266 3673

^b Department of Chemistry, Curtin University, Kent Street, Bentley 6102 WA, Australia

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-Li₂B₁₂H_12−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.

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Article information

DOI: https://doi.org/10.1039/C3CP53090F
Article type: Communication
Submitted: 23 Jul 2013
Accepted: 20 Aug 2013
First published: 23 Aug 2013

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Phys. Chem. Chem. Phys., 2013,15, 15825-15828

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First-order phase transition in the Li₂B₁₂H₁₂ system

M. Paskevicius, M. P. Pitt, D. H. Brown, D. A. Sheppard, S. Chumphongphan and C. E. Buckley, Phys. Chem. Chem. Phys., 2013, 15, 15825 DOI: 10.1039/C3CP53090F

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