研究目的
To reveal the atomic-scale structure characteristics of antiferroelectric silver niobate, including cation displacement and domain boundaries, using spherical aberration corrected electron microscopy.
研究成果
The atomic-resolution images revealed that in the antiferroelectric Pbcm phase of silver niobate, all cations deviate from their average positions, forming periodic wavy atomic planes. The study also identified 90° antiferroelectric domain boundaries and antiphase domain wall defects, enhancing the understanding of antiferroelectric materials.
研究不足
The study focuses on the Pbcm phase of silver niobate, and the analysis of other phases or defects may require further investigation.
1：Experimental Design and Method Selection:
The study utilized spherical aberration corrected electron microscopy to obtain atomic-resolution images of silver niobate.
2：Sample Selection and Data Sources:
Silver niobate ceramics were prepared by a conventional solid-state reaction method.
3：List of Experimental Equipment and Materials:
A FEI TECNAI G220 TEM and a spherical aberration-corrected Titan Themis TEM were used.
4：Experimental Procedures and Operational Workflow:
Samples were mechanically polished and ion-milled to achieve electron transparency.
5：Data Analysis Methods:
Image filtering, peak finding, Gaussian fitting, and statistical analysis were performed using self-made MATLAB code.
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