Europhys. Lett, 48 (3), pp. 326-331 (1999)
Relaxor freezing and electric-field-induced ferroelectric transition in a lanthanum lead zirconate titanate ceramics
V. Bobnar, Z. Kutnjak, R. Pirc and A. Levstik
Jozef Stefan Institute - P.O. Box 3000, 1001 Ljubljana, Slovenia
(received 6 May 1999; accepted in final form 26 August 1999)
PACS. 77.80Bh - Phase transitions and Curie point.
PACS. 78.20Ci - Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity).
PACS. 77.84Dy - Niobates, titanates, tantalates, PZT ceramics, etc.
Transition lines between various phases in the electric-field-temperature phase diagram of 9/65/35 lanthanum lead zirconate titanate ceramics were determined by measurements of the temperature and electric-field-dependent dielectric constant. Above the critical field () the dc bias electric field induces a transition from the relaxor to the ferroelectric phase, while below the system exhibits a freezing transition between the ergodic and nonergodic relaxor state. Transition lines are discussed in terms of the spherical random-bond-random-field model of relaxor ferroelectrics. Measurements in the quasistatic temperature regime confirm the prediction of the model that the nonlinear dielectric response shows a sharp peak at the freezing transition temperature.
Erratum: Figure 1
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