Dielectric, piezoelectric and dc bias characteristics of Bi-doped PZT multilayer ceramic actuator

Smart materials have an important role in modern applications. They have contributed to improving various applications in several fields. One of the areas most affected by the improvement of smart ...

https://journals.sagepub.com/doi/pdf/10.1177/26349833211016479

Smart materials for changing the electrical properties of nanostructures

The present manuscript reports the structural, dielectric, ferroelectric and optical properties of Bi substituted BaTiO3 (BT) ceramic with general formula Ba1-xBi2x/3TiO3, synthesized by conventional solid-state reaction route. The recorded room temperature XRD spectra show a tetragonal symmetry and the tetragonality reduces with Bi-doped derivatives. The temperature-dependent dielectric behavior of the compositions is studied and modification in the paraelectric-ferroelectric (PE-FE) phase transition is observed. The dielectric diffusivity increases with substitution of Bi3+ ion on A-site of BaTiO3 because of modified polar structure. The temperature coefficient of dielectric constant has been calculated and obtained values suggest that the composition x = 0.01 and 0.025 are suitable for X5R (− 15% ≤ 
 $$\left( {\varepsilon - \in_{{25^{0} {\text{C}}}} } \right)/ \in_{{25^{0} {\text{C}}}}$$
  ≤ 15%, temperature range from − 55 to 85 °C) multi-layer ceramic capacitor (MLCC) application. A relaxor behavior has been observed for x = 0.1 and the Vogel-Fulcher fitting of the composition was carried out. The ferroelectric behavior illustrates that the coercive field and the remnant polarization increase up to x = 0.05 and decrease for higher doping. The energy storage efficiency for all the compositions has been calculated and the highest efficiency was obtained for x = 0.1. The optical property of all the synthesized samples has been studied using UV–Visible spectroscopy.

Compositional induced structural, dielectric, ferroelectric and optical study of Bismuth modified Barium Titanate ceramic

The Roles of Piezoelectric Ultrasonic Motors in Industry 4.0 Era: Opportunities & Challenges

Effect of sintering temperature on physical, mechanical, and electrical properties of nano silica particles synthesized from Indonesia local sand for piezoelectric application

The inertia drive piezoelectric motor generally employs an asymmetric waveform driving signal, and the power supply for generating such type of driving signal is complicated and costly. In order to simplify the driving power of the inertia drive piezoelectric motor, a low-frequency piezoelectric motor driven by a 50 Hz sine wave is proposed in this paper. We first analyze the working principle: the pressure between the rotor and the stator changes asymmetrically in one working cycle, driving the rotor’s one-way rotation. Then we establish the dynamic model of the system and study the influence of the pre-stress between the stator and the rotor on the output performance of the low-frequency piezoelectric motor. Finally, the prototype is made and tested for performance. Experiments show that the low-frequency piezoelectric motor resonates at a driving frequency of 50 Hz, where the amplitudes of the stator in the vertical direction and the rotational direction are 21 μm and 136 μm respectively. When the pre-stress between the stator and the rotor is 5 N, the motor speed reaches a maximum value of 4.3 r/min; when the pre-stress is 11 N, the torque of the motor reaches a maximum value of 0.29 Nm.

Yin Wu

Papers

Design and experimental performance of a low-frequency piezoelectric motor based on inertia drive