研究目的
Investigating the local structure and size effects on KNbO3 nanocrystals grown by solvothermal technique assisted by microwave treatment.
研究成果
The local structure of KNbO3 nanocrystals was found to be rhombohedral, similar to bulk KNbO3, despite the cubic shape and system of the nanocrystals. The unit cell size decreased with increasing particle size, and the bond distances of Nb-O and K-O changed accordingly. The study provides insights into the size effects on the structural properties of KNbO3 nanocrystals.
研究不足
The study is limited to KNbO3 nanocrystals with cubic shape and does not explore other morphologies or compositions. The analysis is also constrained by the resolution and accuracy of high-energy X-ray scattering techniques.
1：Experimental Design and Method Selection:
KNbO3 nanocrystals were grown by a solvothermal method assisted by microwave treatment. High-energy X-ray powder diffraction data were collected for structural analysis.
2：Sample Selection and Data Sources:
Samples with growth times of 0, 5, 10, 30, and 90 min were used for structural characterization.
3：List of Experimental Equipment and Materials:
High-energy X-ray powder diffraction was performed at BL14B1 in SPring-
4：Experimental Procedures and Operational Workflow:
The nanocrystals were characterized by scanning electron microscopy (SEM) and high-energy X-ray scattering. The particle size was estimated using Scherrer's equation.
5：Data Analysis Methods:
Average structural parameters were extracted by the Rietveld method, and local atomic parameters were analyzed using the pair-distribution function (PDF) analysis.
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