Effects of SiO2 coating on microstructure and energy storage performance of BaTiO3@SiO2 composite Ceramics
To obtain a high breakdown field and energy density of the energy storage capacitor based on compos-ite ceramic materials,one of the difficulties is to study the effects of the interface and boundary layer of nanop-articles of the composite ceramic materials.In this paper,the characteristics and energy storage properties of BaTiO3@SiO2 composite ceramic materials obtained by sintering of BaTiO3 particles coated with SiO2 of differ-ent thicknesses were studied.It is found that the breakdown strength and discharge energy density of ceramic materials were improved by sintering BaTiO3 particles coated with SiO2.Reducing the size of BaTiO3 particles greatly increased the interface between BaTiO3 and SiO2,which affected the formation of new phases and changed the crystal structure.As a result,BaTiO3@SiO2 composite ceramics using larger filler particles have denser metallographic microstructure,higher breakdown field strength,and higher discharge energy density than BaTiO3@SiO2 composite ceramics using extremely fine filler particles.
composite materialssurface coatingbreakdown field strengthenergy densitynanoparticle interface
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