研究目的
Investigating the electrical response of poled (Bi0.5Na0.5)0.935Ba0.065TiO3 ceramics as a function of temperature, focusing on the effects of structural parameters in the conduction processes.
研究成果
Poled (Bi0.5Na0.5)0.935Ba0.065TiO3 ceramics exhibit low-frequency dispersion and electron hopping mechanism, with evidence of a phase change at 125°C. The material's electrical behavior is influenced by its structural parameters, showing potential for applications in ferroelectric devices.
研究不足
The study focuses on a specific composition of BNBT ceramics and their electrical properties under certain temperature ranges. The effects of other dopants or variations in the preparation method were not explored.
1：Experimental Design and Method Selection
A solid-state reaction method was used to prepare BNBT (0.935/0.065) ceramics. The materials were characterized by electrical impedance spectroscopy, X-ray diffraction, and Rietveld refinement.
2：Sample Selection and Data Sources
Bi2O3, TiO2, Na2CO3, and BaCO3 (99%+ purity, Sigma-Aldrich) were used as starting chemicals to prepare the ceramics.
3：List of Experimental Equipment and Materials
Planetary electronic agate mill, SOLARTRON 1260 Frequency Response Analyzer, SOLARTRON 1296 dielectric interphase, Siemens D5000 X-ray diffractometer.
4：Experimental Procedures and Operational Workflow
The mixture was calcinated, milled, formed into pellets, sintered, and then poled with an electrical field. Electrical measurements were conducted from room temperature up to 300°C.
5：Data Analysis Methods
Rietveld refinement was performed using GSAS-EXPGUIVR software for structural characterization. Electrical properties were analyzed through impedance spectroscopy.
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