研究目的
Investigating the orientation dependence of electric field induced strain and phase transitions in lead-free (Na0.5Bi0.5)TiO3-based single crystals.
研究成果
The study concludes that the phase structure and stability of NBT-6BT-2KNN single crystals are dependent on the crystallographic orientation along which the electric field is applied. A field-induced transition from pseudocubic to ferroelectric tetragonal phase was observed for [001] direction, while a partial transition to rhombohedral phase was observed for [111] direction. These findings contribute to the understanding of field-induced macroscopic strain in lead-free NBT-based ferroelectrics.
研究不足
The study is limited to the specific composition of NBT-6BT-2KNN single crystals and the conditions under which the experiments were conducted. The phase transitions observed may not be generalizable to other compositions or conditions.
1：Experimental Design and Method Selection:
The study involved in situ field-dependent micro-Raman spectroscopy combined with in situ X-ray diffraction (XRD) measurements to investigate the phase transitions.
2：Sample Selection and Data Sources:
Single crystals of NBT-6BT-2KNN were grown by the TSSG method. Pseudocubic crystal orientation was determined using Laue diffraction pattern.
3：List of Experimental Equipment and Materials:
Raman spectra were recorded using a Jobin-Yvon LabRAM HR 800 UV spectrometer with a 488 nm line of an Ar+ laser. In-situ XRD measurements were performed using a Philips MPD high resolution XRD system. Polarization (P-E) and strain (S-E) hysteresis loops were measured using a ferroelectric test system (aixACCT TF analyzer 1000).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The dimensions of the samples are 4×4×
5：4mm with two main faces perpendicular to [001] and [111] directions. The (100) and (111) faces of samples were optically polished and coated with semitransparent gold electrodes for E-field application. Data Analysis Methods:
The evolution of Raman spectra and XRD patterns under various electric fields were analyzed to identify phase transitions.
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