研究目的
To study the effect of nanocrystalline size of the particles on ferroelectric properties of KNbO3, including hysteresis parameters, phase transition temperatures, and domain morphology.
研究成果
KNbO3 nanoparticles retain ferroelectric behavior at the nanolevel, with lowered phase transition temperatures and decreased spontaneous polarization compared to bulk. The presence of 60, 90, and 180(cid:1) domain structures confirms the retention of ferroelectric properties. The study provides insights into the size effects on ferroelectric properties of perovskite materials.
研究不足
The study is limited by the size and morphology of the nanoparticles, which may affect the ferroelectric properties. The polarization values are small compared to bulk materials, indicating potential limitations in applications requiring high polarization.
1：Experimental Design and Method Selection:
A modified polymerized complex method was used to synthesize KNbO3 nanocrystallites.
2：Sample Selection and Data Sources:
The synthesized KNbO3 nanoparticles were characterized using XRD, FTIR, FEG-SEM, TEM, P-E hysteresis, and DSC techniques.
3：List of Experimental Equipment and Materials:
X-ray diffractometer (D8 ADVANCE, BRUKER, GERMANY), FTIR spectrometer (FTIR-8400S, SHIMADZU), FEG-SEM (JOEL, JSM-7600F), TEM (JOEL, JEM 2100), AUTOMATIC P-E LOOP TRACER (MARINE India), Mettler Toledo DSC 822e system.
4：Experimental Procedures and Operational Workflow:
The synthesis involved dissolving Nb2O5 in HF, mixing with methanol, adding citric acid and K2CO3, esterification, drying, and calcination. Characterization followed synthesis.
5：Data Analysis Methods:
XRD data was refined using 'FULLPROF' software. Domain structures were analyzed based on TEM images and theoretical models.
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