研究目的
Investigating the effect of titanium excess and deficiency on the microstructure and dielectric properties of lanthanum doped Ba0.55Sr0.45TiO3 to achieve materials with colossal permittivity and low dielectric losses.
研究成果
The study demonstrates that fine adjustments in composition can lead to materials with colossal permittivity and relatively low dielectric losses over a wide range of frequencies and temperatures, suggesting potential for capacitor applications with further optimization.
研究不足
The study is limited by the specific compositions and sintering conditions used, and the potential for further optimization of the materials for lower losses and wider frequency ranges.
1：Experimental Design and Method Selection:
The samples were prepared by the mixed oxide method and sintered in a conventional oven at temperatures ranging from 1400 °C to 1475 °C.
2：Sample Selection and Data Sources:
(Ba0.54875Sr0.44875La0.0025)Ti(1+x)O3 with x = +0.25 %; 0 and -
3：54875Sr44875La0025)Ti(1+x)O3 with x = +25 %; 0 and -25 % were synthesized. List of Experimental Equipment and Materials:
0.25 % were synthesized. 3. List of Experimental Equipment and Materials: BaCO3, SrCO3, TiO2, and La2O3 were used as raw materials.
4：Experimental Procedures and Operational Workflow:
The powders were mixed, dried, pressed into pellets, calcined, crushed, sieved, and sintered.
5：Data Analysis Methods:
XRD measurements were conducted to confirm the phases, and dielectric measurements were conducted with an HP 4284A LCR meter.
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