研究目的
This study aims at presenting a completer overview of the effects of admixtures such as BaTiO3 on the properties of the KNN system by examining over a wide range of temperatures the behaviour of the dielectric, elastic, and polarization characteristics in the (1-x)(K0.5Na0.5)(Nb0.93Sb0.07)O3–xBaTiO3 + 0.5mol%MnO2 (KNNS7–xBT) ferroelectric ceramics system of x = 0.01, 0.02, and 0.04.
研究成果
The growth of BT content broadens and shifts phase transitions to lower temperatures, increases conductivity, and affects polarization and elastic properties. The compound with x=0.02 exhibits the most favourable properties. Future studies could explore other admixtures or detailed structural analyses.
研究不足
The study is limited to specific compositions (x = 0.01, 0.02, 0.04) and temperature ranges. The heterogeneity in samples with higher BT content (x=0.04) may affect results, and the use of conventional ceramics technology might not capture all material properties. Potential optimizations could include varying more parameters or using advanced synthesis methods.
1：Experimental Design and Method Selection:
The study uses conventional ceramics technology for sample preparation, involving solid phase thermo-chemical reaction. Dielectric response is measured using RLC devices and Sawyer-Tower circuits, and acoustic properties are measured using resonance techniques.
2：Sample Selection and Data Sources:
Ceramic samples of (1-x)(K
3：5Na5)(Nb93Sb07)O3–xBaTiO3 + 5mol%MnO2 with x = 01, 02, and 04 are prepared from finely ground oxides and carbonates. List of Experimental Equipment and Materials:
E7-15 RLC measuring device, modified Sawyer-Tower circuit, equipment for acoustic wave velocity measurement (resonance techniques), silver paste for electrodes.
4：Experimental Procedures and Operational Workflow:
Samples are calcined at 1100–1200 K and sintered at 1300–1500 K. For dielectric measurements, sample plates are supplied with silver paste electrodes. Polarization loops are obtained at frequencies 1–10 Hz. Acoustic wave velocity is measured in polarized bar samples.
5：Data Analysis Methods:
Analysis of dielectric permittivity, polarization loops, and acoustic properties to observe phase transitions and material behavior.
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