Journal
THERMOCHIMICA ACTA
Volume 520, Issue 1-2, Pages 75-79Publisher
ELSEVIER
DOI: 10.1016/j.tca.2011.02.043
Keywords
Lithium tetrahydroborate; Calorimetry; Molar heat capacity; Crystalline phase transition
Funding
- European Commission [MRTN-CT-2006-035366]
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New calorimetric determinations of molar heat capacity C-p,C-m of lithium tetrahydroborate (LiBH4) were performed in order to analyze the origin of the previously observed anomaly before the polymorphous transition at 386 K. The above room temperature dependence of LiBH4 C-p,C-m was measured until approaching the melting point of the compound at 553 K and the abnormal behaviour was attributed to lattice defects independent of the main crystalline phase transition. As a result, lower entropy of the transition Delta S-trs = 13.11 +/- 0.23J K-1 mol(-1) than that proposed in literature was obtained, which is in agreement with the observed anisotropy and crystal density decrease before the transition from recent X-ray diffraction indexing. An estimate of the liquid C-p,C-m of LiBH4 molten salt is proposed. (C) 2011 Elsevier B.V. All rights reserved.
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