Ca(BH(4))(2) compounds were investigated above room temperature by anelastic spectroscopy (AS) and concomitant measurements of thermogravimetry and mass spectrometry (TGA/MS). Both AS and TGA/MS indicate that even after a thermal treatment at 125 degrees C for 20 h, a non-negligible residual of THF adduct is still present in the sample, which can be removed on a subsequent thermal treatment at temperatures lower than 250 degrees C. Above 250 degrees C dehydrogenation takes place. Moreover, AS sensitively detects the occurrence of the alpha -> alpha' structural phase transition around 180 degrees C, and the alpha' -> beta transformation, which is completed around 330 degrees C. We also show that both transitions are irreversible and are not accompanied by a latent heat. (C) 2010 Elsevier B.V. All rights reserved.

Structural phase transitions and adduct release in calcium borohydride / A., Paolone; O., Palumbo; Rispoli, Pasquale; Cantelli, Rosario; A., Luedtke; E., Ronnebro; D., Chandra. - In: JOURNAL OF ALLOYS AND COMPOUNDS. - ISSN 0925-8388. - 509:2(2011), pp. S691-S693. (Intervento presentato al convegno 12th International Symposium on Metal-Hydrogen Systems, Fundamentals and Applications (MH2010) tenutosi a Moscow, RUSSIA nel JUL 19-23, 2010) [10.1016/j.jallcom.2010.10.115].

Structural phase transitions and adduct release in calcium borohydride

RISPOLI, PASQUALE;CANTELLI, Rosario;
2011

Abstract

Ca(BH(4))(2) compounds were investigated above room temperature by anelastic spectroscopy (AS) and concomitant measurements of thermogravimetry and mass spectrometry (TGA/MS). Both AS and TGA/MS indicate that even after a thermal treatment at 125 degrees C for 20 h, a non-negligible residual of THF adduct is still present in the sample, which can be removed on a subsequent thermal treatment at temperatures lower than 250 degrees C. Above 250 degrees C dehydrogenation takes place. Moreover, AS sensitively detects the occurrence of the alpha -> alpha' structural phase transition around 180 degrees C, and the alpha' -> beta transformation, which is completed around 330 degrees C. We also show that both transitions are irreversible and are not accompanied by a latent heat. (C) 2010 Elsevier B.V. All rights reserved.
2011
hydrogen absorbing materials; phase transitions; thermal analysis; ultrasonics
01 Pubblicazione su rivista::01a Articolo in rivista
Structural phase transitions and adduct release in calcium borohydride / A., Paolone; O., Palumbo; Rispoli, Pasquale; Cantelli, Rosario; A., Luedtke; E., Ronnebro; D., Chandra. - In: JOURNAL OF ALLOYS AND COMPOUNDS. - ISSN 0925-8388. - 509:2(2011), pp. S691-S693. (Intervento presentato al convegno 12th International Symposium on Metal-Hydrogen Systems, Fundamentals and Applications (MH2010) tenutosi a Moscow, RUSSIA nel JUL 19-23, 2010) [10.1016/j.jallcom.2010.10.115].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/356424
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