Electrodynamic properties of lead zirconate titanate in the microwave range in the vicinity of high-temperature phase transitions

Devoted to determining the mechanisms of dielectric constant dispersion in the frequency range 8.2...12.4 GHz in solid solutions of the PbZr_(1–x)Ti_xO₃ (PZT) system depending on temperature, taking into account phase transitions. The object of study was a finely dispersed powder of the composition PbZr_0.97Ti_0.03O₃, which has two phase transitions in the temperature range 25...250 °C: from antiferroelectric to ferroelectric state at a temperature of ~227 °C and from ferroelectric to paraelectric state at a temperature of ~240 °C. Measurements of reflection and transmittance coefficients in the specified temperature range were carried out using a rectangular waveguide, and the complex dielectric constant was calculated using the Nicholson–Ross–Weir method. Dielectric relaxation was detected in the frequency range under study, presumably associated with the soft mode mechanism. The greatest relaxation losses occur in the paraelectric and ferroelectric states in the vicinity of the phase transition. The material under study has the least losses when it is in an antiferroelectric state at temperatures close to room temperature.

Authors: P. A. Astafev, K. P. Andryushin, A. M. Lerer, L. A. Reznichenko

Direction: Physics

Keywords: ferroelectric, antiferroelectric, paraelectric, phase transition, microwave, dielectric constant, dielectric loss

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