Nonlinear dielectric response of lead zirconate titanate in the microwave range

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Abstract
The paper studies the nonlinear electrical response of dispersed-crystalline lead zirconate titanate powders (PbZr[ ]Ti[ ]O 3 , PZT) in the microwave range (8.2–12.4[ ]GHz). The main attention is paid to the influence of temperature and incident wave power on the dielectric properties of the material, especially near the morphotropic phase boundary (MPB) and phase transitions (PTs). The experiments were carried out using a waveguide measuring cell and a vector network analyzer. The results showed that the permittivity and losses of the material depend on the frequency, temperature and microwave power. A broad relaxation maximum of losses was found at ∼12[ ]GHz, which shifts to the low-frequency region upon heating. It is assumed that this maximum is due to the presence of several competing polarization mechanisms associated with the reorientation of dipoles in the B sublattice. At higher powers (>5[ ]dBm), nonlinear effects were observed, including the disappearance of the relaxation maximum, which may be due to local heating and destabilization of dipole configurations. The obtained data emphasize the importance of taking into account cooperative interactions and structural transitions when analyzing the dielectric response of PZT in the microwave range.
Funding Information
  • Ministry of Science and Higher Education of the Russian Federation (State task in the field of scientific activity. Project No. FENW-2023-0010/GZ0110/23-11-IF)

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