研究目的
To study the effect of strontium on the structural, microstructural, dielectric, and electrical properties of strontium-modified calcium copper titanate (CSCTO) for potential applications in energy storage devices like supercapacitors.
研究成果
The CSCTO ceramic exhibits cubic symmetry, high dielectric permittivity, and low loss, attributed to space charge polarization and Maxwell-Wagner relaxation. It shows potential for applications in supercapacitors and microelectronic devices, with non-Debye relaxation and activation energy related to oxygen vacancies. Future work could focus on enhancing properties for practical use.
研究不足
The study is limited to a specific composition (5 mol% Sr doping) and synthesis method; potential impurities or defects from high-temperature processing may affect results; the ferroelectric loop shows lossy behavior indicating leakage currents; further optimization of doping levels and processing conditions could be explored.
1：Experimental Design and Method Selection:
The study used a high-temperature ceramic processing route to synthesize CSCTO, with structural, microstructural, dielectric, and electrical analyses conducted using X-ray diffraction, scanning electron microscopy, energy-dispersive spectrometry, LCR meter, and ferritester. Theoretical models like Maxwell-Wagner relaxation and impedance spectroscopy were employed.
2：Sample Selection and Data Sources:
The sample was prepared from high-purity precursors (SrCO3, CaCO3, CuO, TiO2) with specific particle sizes, weighed stoichiometrically, ground, heated, compressed into pellets, and sintered.
3：List of Experimental Equipment and Materials:
Equipment includes Rigaku SmartLab X-Ray diffractometer, ZEISS EVO10 SEM with EDS, N4L LCR meter, Radiant Precision Premier-II Ferritester, hydraulic press, tubular furnace. Materials include SrCO3 (purity=98%), CaCO3 (purity=99%), CuO (<50 nm, purity=99.99%), TiO2 (<21 nm, purity=99.99%), PVA binder, silver paint.
4：99%), TiO2 (<21 nm, purity=99%), PVA binder, silver paint.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Precursors were ground, heated to 600°C for 5h, quenched, compressed into pellets using hydraulic press, sintered at 1200°C for 12h, characterized by XRD, SEM/EDS, electrical properties measured with LCR meter over 25-315°C and 1kHz-2MHz, ferroelectric loop measured at room temperature.
5：Data Analysis Methods:
Data analyzed using impedance spectroscopy, Nyquist plots fitted with Z SIMP WIN Version 2 software, Arrhenius equation for activation energy, and various dielectric and conductivity formulas.
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