研究目的
Investigating the electrical properties and polarization fatigue of [001]-oriented 6PSN-70PMN-24PT crystals to assess their piezoelectric stability and performance compared to binary PMN-PT crystals.
研究成果
The [001]-oriented 6PSN-70PMN-24PT crystal exhibits excellent piezoelectric stability with high thermal and electric field resistance, and reduced polarization fatigue compared to binary PMN-PT crystals, attributed to a large coercive field and enhanced ferroelectric coupling. This makes it promising for high-power applications.
研究不足
The study is limited to specific crystal compositions and orientations; results may not generalize to other materials. The fatigue tests were conducted under specific conditions (300 Hz, 8 kV/cm), and long-term stability beyond 2×10^6 cycles was not fully explored. Crystal growth methods may introduce defects affecting properties.
1：Experimental Design and Method Selection:
The study involved growing 6PSN-70PMN-24PT crystals using a modified Bridgman method to achieve a single rhombohedral structure, avoiding composition-induced phase transitions. Electrical properties and fatigue were measured to evaluate stability.
2：Sample Selection and Data Sources:
[001]-oriented crystals with dimensions of 4 × 4 × 0.4 mm3 were cut from the grown crystals. Binary 68PMN-32PT crystals were used for comparison.
3：4 mm3 were cut from the grown crystals. Binary 68PMN-32PT crystals were used for comparison.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a Rigaku diffractometer (Shimadzu 6000) for XRD, Agilent E4980A LCR meter for dielectric properties, ZJ-6A d33 meter for piezoelectric constant, Agilent 4294 instrument for electromechanical properties, and Precision Premier II instrument for fatigue tests. Materials included fired silver paste for electrodes.
4：Experimental Procedures and Operational Workflow:
Crystals were poled and annealed at different temperatures; properties were measured at room temperature. Fatigue tests were performed at 300 Hz with an 8 kV/cm electric field.
5：Data Analysis Methods:
Data were analyzed using XRD for structure, LCR meter for dielectric constant, d33 meter for piezoelectric constant, resonance frequencies for electromechanical coupling, and hysteresis loops for ferroelectric properties. Statistical analysis included error bars based on average values.
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