研究目的
Investigating the dielectric and thermal behavior of 0.75BiFeO3-0.25BaTiO3 filled ethylene vinyl acetate composites for potential applications in solar cells and energy saving devices.
研究成果
The BFO-BT filled EVA composite system exhibits enhanced dielectric properties and thermal stability, making it a promising candidate for application in the field of solar cell and energy saving devices. The 30 phr of BFO-BT loaded EVA/ BFO-BT polymer composite shows high dielectric constant (?r = 181.06, at 25°C and 1 kHz) and the dielectric loss of the composite shows only an approximately 2-fold increase (from 0.091 to 0.183) (tanδ = 0.091, at 25°C and 1 kHz).
研究不足
The study is limited to the investigation of dielectric and thermal behavior of BFO-BT filled EVA composites up to 40 phr BFO-BT loading. The mechanical properties of the composites at higher filler loading were not explored.
1：Experimental Design and Method Selection:
The BFO-BT sample was processed by solid state ceramic route. EVA/BFO-BT composites were processed by solution casting technique followed by compression molding.
2：Sample Selection and Data Sources:
Highly purified chemicals like Bi2O3, Fe2O3, BaCO3 and TiO2 were used to prepare the desired sample
3：75BiFeO3-25BaTiO3 (BFO-BT). Ethylene Vinyl Acetete (EVA) with VA content 18% and Di-cumyl peroxide (DCP) were used. List of Experimental Equipment and Materials:
X-ray powdered diffractometer (RIGAKU MINI FLEX), field Emission Scanning Electron Microscopy (JEOL-JSM), Differential scanning calorimetry (DSC), Perkin Elemer PYRIS Diamond TG-DTA, LCR meter (PSM 1735).
4：5). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The calcined sample was then made into a powdered form of BFOBT which was confirmed by XRD. EVA copolymer was dissolved in dry toluene to prepare a polymeric solution. The appropriate amount of filler BFO-BT was dissolved in dry toluene and sonicated for 30 mins. The mixtures of polymeric solutions and BFO-BT along with
5：2 phr of DCP were mixed together and stirred for 2 h for uniform dispersion of the BFO-BT and then it was cast over a Teflon tray. After that, the solvents were allowed to evaporate by air drying at room temperature followed by vacuum drying at 60°C till a constant weight is obtained. Then all the dried films were molded in a hot press at a pressure of 5 MPa and 160°C temperature for time that is calculated from the rheograph obtained from Monsanto Processability Tester. Data Analysis Methods:
The XRD was carried out using X-ray powdered diffractometer with CuKα radiation in a 2θ range from 20o to 80o at scanning rate 2deg/min. The corresponding d-spacing of the particles were calculated using the Bragg’s equation. The thermal and crystallisation behavior of BFO-BT filled EVA has been studied calorimetrically. Dielectric and electrical properties of the samples of BFO-BT filled EVA composites were studied with the help of the data generated from LCR meter.
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