LiMn1.5Ni0.5O4 is investigated by anelastic spectroscopy in order to study the manganese dynamics. An intense thermally activated peak, detectable only in off-stoichiometric samples, is attributed to a polaronic conduction due to an electron transfer from Mn3+ to a Mn4+, and the consequent motion of the Jahn-Teller lattice distortion. In order to have a good fit of the experimental data, the Jonscher model for ionic dynamics is adopted for the first time in this spinel structure. A value of about 0.3 eV for the energy barrier of the polaronic conduction is obtained. (C) 2014 Elsevier B.V. All rights reserved.
Dynamics of Mn3+ in off-stoichiometric LiMn1.5Ni0.5O4 / Vitucci, F. M.; Palumbo, O.; Paolone, A.; Cantelli, Rosario; Brutti, S.; Panero, Stefania. - In: JOURNAL OF ALLOYS AND COMPOUNDS. - ISSN 0925-8388. - STAMPA. - 604:(2014), pp. 83-86. [10.1016/j.jallcom.2014.03.117]
Dynamics of Mn3+ in off-stoichiometric LiMn1.5Ni0.5O4
CANTELLI, Rosario;S. Brutti;PANERO, Stefania
2014
Abstract
LiMn1.5Ni0.5O4 is investigated by anelastic spectroscopy in order to study the manganese dynamics. An intense thermally activated peak, detectable only in off-stoichiometric samples, is attributed to a polaronic conduction due to an electron transfer from Mn3+ to a Mn4+, and the consequent motion of the Jahn-Teller lattice distortion. In order to have a good fit of the experimental data, the Jonscher model for ionic dynamics is adopted for the first time in this spinel structure. A value of about 0.3 eV for the energy barrier of the polaronic conduction is obtained. (C) 2014 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
