Application Cases

Experiment Name: Domain Engineering Polarization of Relaxor Ferroelectric Single Crystals

Research Direction: Domain Engineering of Relaxor Ferroelectric Single Crystals

Experiment Content: Conducting AC-DC combined polarization above the Curie temperature of relaxor ferroelectric single crystals to enhance the dielectric and piezoelectric properties of the single crystals through domain engineering methods.

Testing Equipment: ATA-7050 high-voltage amplifier, signal generator, digital oscilloscope, silicone oil temperature-controlled furnace, etc.

Figure 1: Experimental Setup

Experiment Process: At 135°C, the UFCP (Ultra-high-temperature Field-Cooling Polarization) method is used to polarize the samples. First, the samples are heated to 135°C, followed by the application of a symmetric triangular wave electric field with a frequency of 0.1 Hz and a peak intensity of 15 kVpp/cm, cycled 10 times to achieve AC pre-polarization (ACP). Subsequently, at the same temperature, a DC electric field of 7.5 kV/cm (DCP) is applied for 5 minutes to further enhance the polarization effect. Finally, while maintaining the DC electric field, the samples are gradually cooled to room temperature to complete the field-cooling polarization process. Throughout the polarization process, the required electric field is obtained using a signal generator and the ATA-7050 voltage amplifier.

Test Results:

Dielectric spectroscopy analysis indicates that the UFCP method promotes electric field-induced phase transitions above the Curie point, forming a stable multi-phase structure. Single crystals (SCs) polarized using the UFCP method have a transverse piezoelectric coefficient d31 of 1126 pC/N and an electromechanical coupling coefficient k31 of 0.559. Compared to the traditional DCP method, UFCP increases d31 by 68.6%, the mechanical quality factor Qm by 16.7%, and the piezoelectric figure of merit (FOM) by 98.3%.

Power Amplifier Recommendation: ATA-7050 High-Voltage Amplifier

Figure: Specifications of the ATA-7050 High-Voltage Amplifier