研究目的
To develop ferroelectric-dielectric composites with appropriate permittivity, low loss tangent, and high tunability for tunable microwave applications by suppressing the doping effect using spark plasma sintering.
研究成果
By suppressing the doping effect through SPS, the composite ceramics achieved higher tunability and lower permittivity than pure Ba0.5Sr0.5TiO3, resolving the contradiction in ferroelectric-dielectric composites. This approach is beneficial for tunable microwave applications and confirms the role of composite effects in enhancing tunability.
研究不足
The study is limited to specific composite compositions (Ba0.5Sr0.5TiO3?Mg2TiO4?MgO) and SPS conditions; results may not generalize to other materials or sintering methods. Optimization of SPS parameters and scalability for industrial applications were not fully explored.
1：Experimental Design and Method Selection:
The study used spark plasma sintering (SPS) to prepare Ba0.5Sr0.5TiO3?Mg2TiO4?MgO composite ceramics, aiming to suppress doping effects and enhance tunability. The phase composition, microstructures, and dielectric properties were analyzed.
2：5Sr5TiO3?Mg2TiO4?MgO composite ceramics, aiming to suppress doping effects and enhance tunability. The phase composition, microstructures, and dielectric properties were analyzed. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Samples were prepared with varying Mg2TiO4?MgO content (0 to 60 wt%) using raw materials including BaCO3, SrCO3, TiO2, Mg2TiO4, and MgO. Powders were mixed via planetary ball milling and calcined.
3：List of Experimental Equipment and Materials:
Equipment included a planetary ball mill, SPS apparatus (SPS-3.20 MKII, Sumitomo Coal Mining Co. Ltd.), XRD (X'Pert PRO, PANalytical B.V.), ESEM (Quanta 200; FEI), LCR meters (Agilent E4980A and TH2816A), and an external power supply. Materials were agate media, deionized water, graphite die, and silver electrodes.
4：20 MKII, Sumitomo Coal Mining Co. Ltd.), XRD (X'Pert PRO, PANalytical B.V.), ESEM (Quanta 200; FEI), LCR meters (Agilent E4980A and TH2816A), and an external power supply. Materials were agate media, deionized water, graphite die, and silver electrodes. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Powders were mixed, calcined at 1100°C, milled with Mg2TiO4 and MgO, sintered via SPS at 1200°C for 5 min under 50 MPa pressure, annealed at 900°C, and characterized using XRD, ESEM, and dielectric measurements at 10 kHz with DC biases up to 1500 V.
5：Data Analysis Methods:
XRD patterns were analyzed for phase identification, ESEM images for microstructure, and dielectric properties (permittivity, loss tangent, tunability) were measured and compared statistically.
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X-ray Diffractometer
X'Pert PRO
PANalytical B.V.
Used to determine the phase composition of the composite ceramics with monochromatic Cu Kα radiation.
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Environmental Scanning Electron Microscope
Quanta 200
FEI
Used to examine the fracture surfaces and microstructures of the composite ceramics.
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Precision LCR Meter
E4980A
Agilent
Used for measuring permittivity and loss tangent of the ceramics at 10 kHz.
E4980A/E4980AL Precision LCR Meter
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Spark Plasma Sintering Apparatus
SPS-3.20 MKII
Sumitomo Coal Mining Co. Ltd.
Used for sintering the composite ceramics at high temperature and pressure to achieve dense microstructures and suppress doping effects.
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LCR Meter
TH2816A
Changzhou
Used for measuring tunability of the ceramics at 10 kHz with DC biases up to 1500 V.
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Planetary Ball Mill
Used for mixing raw materials with agate media in deionized water.
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