| Issue |
Europhys. Lett.
Volume 52, Number 4, November II 2000
|
|
|---|---|---|
| Page(s) | 448 - 453 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00458-0 | |
| Published online | 01 September 2002 | |
Aging, return to disorder and derivability breaking in potassium niobo-tantalate crystals
Laboratoire des Milieux Désordonnés et Hétérogènes
(Associated with the
Centre National de la Recherche Scientifique (UMR 7603).)
Université P. et M. Curie Case 86, 75252 Paris Cedex 05, France
Received:
16
May
2000
Accepted:
20
September
2000
In the ferroelectric phase of two 
(x=0.022 and x = 0.027) samples, we have measured the variation of
the real and imaginary parts of the complex dielectric constant
ε just after an isothermal evolution of duration 
at the temperature 
(plateau). We have found that the
temperature derivative 
has not the same value for 
and 
if is not zero; this means that 
is
not derivable with respect to T. Return to disorder is carefully defined. Its occurrence after a
temperature plateau at has been studied for fixed as a function of
and of measurement frequency.
PACS: 77.22.Gm – Dielectric loss and relaxation / 78.30.Ly – Disordered solids
© EDP Sciences, 2000
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