On the non-exponentiality of the dielectric Debye-like relaxation of monoalcohols.
We have investigated the Debye-like relaxation in a series of monoalcohols (MAs) by broadband dielectric spectroscopy and thermally stimulated depolarization current techniques in order to get further insight on the time dispersion of this intriguing relaxation. Results indicate that the Debye-like relaxation of MAs is not always of exponential type and conforms well to a dispersion of Cole-Davidson type. Apart from the already reported non-exponentiality of the Debye-like relaxation in 2-hexyl-1-decanol and 2-butyl-1-octanol, a detailed analysis of the dielectric permittivity of 5-methyl-3-heptanol shows that this MA also presents some extent of dispersion on its Debye-like relaxation which strongly depends on the temperature. Results suggest that the non-exponential character of the Debye-like relaxation might be a general characteristic in the case of not so intense Debye-like relaxations relative to the α relaxation. Finally, we briefly discuss on the T-dependence and possible origin for the observed dispersion.
Centro de Física de Materiales (CSIC-UPV/EHU), Materials Physics Center (MPC), Paseo Manuel Lardizabal 5, 20018 San Sebastián, Spain.
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0000000299408780
S
Arrese-Igor
Centro de Física de Materiales (CSIC-UPV/EHU), Materials Physics Center (MPC), Paseo Manuel Lardizabal 5, 20018 San Sebastián, Spain.
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0000000161258214
A
Alegría
Centro de Física de Materiales (CSIC-UPV/EHU), Materials Physics Center (MPC), Paseo Manuel Lardizabal 5, 20018 San Sebastián, Spain.
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J
Colmenero