Volume 52, Number 4, November II 2000
|Page(s)||448 - 453|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|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
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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