研究目的
Investigating the temperature-dependent phase transition characteristics in orthorhombic [011]c PMN-0.35PT single crystal to understand its dielectric and piezoelectric properties and phase behavior.
研究成果
The research confirms two phase transitions in [011]c PMN-0.35PT single crystal at 84 °C (O-to-T) and 152 °C (T-to-C), with a diffuseness degree of 1.56 indicating an intermediate state between normal and relaxor ferroelectrics. The findings provide insights into the thermal stability and phase behavior, which are crucial for electromechanical applications. Future work should explore the unclear strain mechanisms and extend to other compositions.
研究不足
The study is limited to a specific composition (PMN-0.35PT) and orientation ([011]c). The cause of certain strain behaviors at high temperatures is unclear and requires further investigation. The experiments are conducted under controlled laboratory conditions, and results may not generalize to other materials or environments.
1：Experimental Design and Method Selection:
The study uses variable temperature dielectric properties, X-ray diffraction, bipolar ferroelectric hysteresis loops (P-E), and electric-field-induced strain (S-E) hysteresis loops measurements to investigate phase transitions.
2：Sample Selection and Data Sources:
PMN-
3：35PT single crystals grown by a modified Bridgman method, cut and oriented along [011] direction, with gold electrodes sputtered. Unpoled and annealed samples are used. List of Experimental Equipment and Materials:
Agilent 4294A impedance analyzer, Delta 9023 temperature control system, ZJ-4A quasi-static piezo-d33 meter, X-ray diffraction instrument (PANalytical X’Pert Pro MPD), TF Analyzer 2000 for hysteresis loops, silicon oil for poling.
4：Experimental Procedures and Operational Workflow:
Samples are prepared by cutting, polishing, and electrode sputtering. Dielectric measurements are done at 10 kHz and 100 kHz with a heating rate of 1 °C/min. XRD is performed on crushed powders. Hysteresis loops are measured at 1 Hz frequency.
5：Data Analysis Methods:
Dielectric data analyzed using a power function relation for diffuseness degree. XRD peaks fitted with Lorentzian function. Hysteresis loop parameters (Pr, Ec, Ps, Rsq) calculated from measurements.
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