研究目的
Investigating the nanometer-scale local structures of the paraelectric cubic phase of potassium niobate (KNbO3) to observe the breaking of cubic symmetry and the existence of local polarization clusters.
研究成果
Breaking of the cubic symmetry was directly observed in the nanometer-scale areas of the cubic phase of KNbO3, indicating the existence of rhombohedral nanometer-scale local polarization clusters. No notable decrease in the number of local polarization clusters was observed up to 890 K.
研究不足
The specimen thicknesses of the observed areas are around 37 nm, which may contain several nanoscale local structures in the direction of the incident electron beam. The cubic symmetry breaking areas observed are static, not dynamic.
1：Experimental Design and Method Selection:
STEM–CBED was used to examine the nanometer-scale local structures of KNbO
2：Sample Selection and Data Sources:
Single crystals of KNbO3 produced by top-seeded solution growth (TSSG) were used.
3：List of Experimental Equipment and Materials:
JEM-2010FEF transmission electron microscope equipped with a Schottky-type field emission gun, an Omega-type in-column energy filter, and a STEM unit with a Gatan STEM diffraction imaging system.
4：Experimental Procedures and Operational Workflow:
Energy-filtered CBED patterns were acquired pixel by pixel by scanning the focused electron probe.
5：Data Analysis Methods:
Symmetry breaking index S was evaluated for each electron probe position.
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