A detailed anelastic spectroscopy study of the structural phase transition of ammonia borane was conducted for the first time. The transformation from the tetragonal high temperature phase into the orthorhombic low temperature one is detected on cooling around 220 K by a huge drop of the elastic modulus and a spike of the elastic energy dissipation. We find clear indications of a hysteresis, which led us to conclude that the transition is of first-order. The kinetics of the transition was investigated in detail. (C) 2009 Elsevier B.V. All rights reserved.
An investigation of the structural phase transition of ammonia borane / Annalisa, Paolone; Oriele, Palumbo; Rispoli, Pasquale; Cantelli, Rosario; Tom, Autrey. - In: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING. - ISSN 0921-5093. - 521-22:(2009), pp. 169-171. (Intervento presentato al convegno 15th International Conference on Internal Friction and Mechanical Spectroscopy (ICIFMS-15) tenutosi a Perugia, ITALY nel JUL 20-25, 2008) [10.1016/j.msea.2008.09.145].
An investigation of the structural phase transition of ammonia borane
RISPOLI, PASQUALE;CANTELLI, Rosario;
2009
Abstract
A detailed anelastic spectroscopy study of the structural phase transition of ammonia borane was conducted for the first time. The transformation from the tetragonal high temperature phase into the orthorhombic low temperature one is detected on cooling around 220 K by a huge drop of the elastic modulus and a spike of the elastic energy dissipation. We find clear indications of a hysteresis, which led us to conclude that the transition is of first-order. The kinetics of the transition was investigated in detail. (C) 2009 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
