研究目的
To develop a rapid electromechanical method for determining the crystallographic orientation of an [011] RFSC disk and to estimate the piezoelectric charge constants d31, d32.
研究成果
The paper demonstrates a new electromechanical method for determining the crystallographic directions of a [011] poled RFSC disk, in addition to estimates of the piezoelectric charge constants d31 and d32. The method is rapid, inexpensive, and the results compare favourably to the results of synchrotron x-ray diffraction.
研究不足
The method underestimates the piezoelectric charge constants by 25% due to the non-uniform stress distribution in the disk samples under the compressive load. The minimum thickness of the disks that can be tested is a practical consideration, and the load eccentricity created by the finite resolution of 3D printing of the polymer jig is another practical consideration.
1：Experimental Design and Method Selection:
The method involves orienting the disk through a range of angles θ, applying a known compressive boundary force at each angle, and recording the disk’s open-circuit voltage.
2：Sample Selection and Data Sources:
Mn-PMN-PZ-PT RFSC disks with diameter
3：35 mm and thickness 5 mm were used. List of Experimental Equipment and Materials:
A jig for applying a boundary load, digital microscope (Dino-lite Premier AM7013MTZ), force head (IACAS ZJ-6B), load cell (PCB 208C01), oscilloscope (Tektronix TDS 220), and probe (P6015A).
4：Experimental Procedures and Operational Workflow:
The disk is subjected to a prescribed compressive loading condition of ～
5：42 N at 110 Hz along the disk’s upper and lower quadrant boundaries at each angle θ. Data Analysis Methods:
A particle swarm optimization is used to fit the measured disk voltage versus angle θ to determine the disk’s crystallographic directions and charge constants.
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