The tetragonal-to-orthorhombic phase transformation in ammonia borane and in its deuterium substituted compounds

Palumbo, O.; Paolone, A.; Rspoli, Pasquale; Cantelli, R.; Autrey, Tom; Navarra, Maria Assunta

doi:10.1016/j.jallcom.2010.10.217

Cited by 4 publications

(1 citation statement)

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“…Very interestingly, the 3 0 r versus temperature curve displays a sharp kink around T z 232 K, close to the temperature reported for the structural transition as seen by DSC measurements. 24 As it can be observed 3 0 r is frequency independent and increases with temperature in the whole studied temperature range. Another interesting remark is the almost linear behaviour of 3 0 r (T) for T > 232 K.…”

Section: Resultsmentioning

confidence: 59%

New properties in old systems: cooperative electric order in ferrocene and ammonia-borane

et al. 2015

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After half a century of intensive and extensive studies on ferrocene [Fe(C 5 H 5 ) 2 ] and ammonia-borane (H 3 N$BH 3 ), it is very exciting to observe that these "classical" compounds still hide interesting properties never described before. Despite it being well-known that they both experience phase transitions as a function of temperature, here, for the first time, we give experimental evidence for the dielectric transitions they experience associated to the former, results that we support with DFT calculations. In that context, we report that ferrocene displays a temperature-induced paraelectric to antiferroelectric transition associated with the monoclinic-triclinic transition, which implies order-disorder of the cyclopentadienyl (Cp) ligands and displacement of the Fe atoms within the ferrocene molecules. As for the ammonia-borane, we report a sharp dielectric transition at T z 232 K, associated with a structural transition that combines ordering and atomic displacement of the H 3 N$BH 3 molecules. In this case, we attribute such behaviour to the temperature dependent displacement of the H 3 N$BH 3 molecules out-of the crystal polar c-axis.

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Section: Resultsmentioning

confidence: 59%