Volume 65, Number 1, January 2004
|Page(s)||55 - 60|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 December 2003|
Coexistence of two universal relaxations in the glassy freezing of a deuteron dipole glass
Physics Department, Korea Advanced Institute of Science and Technology Taejon 305-701, Korea
Corresponding author: email@example.com
Accepted: 23 October 2003
A deuteron dipole glass (ND4)xD2PO4 (DRADP-x, ) was studied on glassy freezing by low-frequency dielectric measurements at low temperatures of slow dynamic freezing. A very broad distribution of relaxation times (relaxation frequencies) was observed to show an apparent crossover behavior from the relaxation time distributions with a long-time (low-frequency) tail to the distributions with a short-time (high-frequency) tail as temperature was lowered to below 40. We show that this apparent crossover behavior may be originated by two competing relaxations in coexistence: one characterized by an Arrhenius law and the other by an inverse Arrhenius law temperature dependence, corresponding to the two slow-relaxation modes ( and ) of the dynamically correlated domains (DCDs) model of Chamberlin et al.
PACS: 64.70.Pf – Glass transitions / 77.22.Gm – Dielectric loss and relaxation / 78.30.Ly – Disordered solids
© EDP Sciences, 2004
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