Volume 46, Number 3, May I 1999
|Page(s)||351 - 356|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
A new low-temperature state in a La-modified lead zirconate titanate relaxor
Laboratoire de Physique de la Matière Condensée,
Université de Picardie Jules Verne 33 rue Saint-Leu, 80039, Amiens,
2 Institute for Materials Sciences, NASC of Ukraine Krjijanovskogo Str., 3, 252180, Kiev, Ukraine
3 Institute of Physics of Semiconductors, NASC of Ukraine prosp. Nauki, 45, 252650, Kiev, Ukraine
Accepted: 19 February 1999
Several anomalies are observed in the relaxor system at low temperature for the first time: a boson peak in the Raman scattering at frequencies below , and extrema in the dielectric permittivity and pyroelectric current near 45 K. Calculations show that these anomalies are connected with a polarization-deformation coupling via electrostriction. Due to this coupling, the new low-temperature glassy state is called an "improper dipole glass”. The generality of the proposed model suggests that similar states should also exist in other disordered ferroelectrics.
PACS: 63.50.+x – Vibrational states in disordered systems / 77.84.Dy – Niobates, titanates, tantalates, PZT ceramics, etc
© EDP Sciences, 1999
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