Research On Properties And Application Of Barium Titanate Based Composites

Barium titanate?BaTiO₃?is a typical perovskite structure material and has always been an important basic material in the field of electronics.We continue to explore the photoelectric properties and reaction principles based on the preparation of BaTiO₃ based composites with good morphology.We can obtain a controllable process route,which lay the foundation for the application of ferroelectric materials in the field of photocatalysis and electromechanical conversion,and broaden the application potential of barium titanate based composite materials in environmental treatment and building energy conservation.Herein,a self-made TiO₂ microsphere was used as template to prepare Ba TiO₃microspheres with good morphology through hydrothermal method combined with subsequent heat treatment.It has shown that the hydrothermal temperature and heat treatment process play a key role in the final morphology and yield of the product.Under hydrothermal temperature of 90°C,Ba²⁺reacts with dissolved CO₂ to form a coated BaCO₃ on the surface of TiO₂ precursor.The generated BaCO₃ can fix the source of Ba²⁺,and further reacts with the precursor to form micro-nano hierarchical structure BaTiO₃ in the heat treatment process.This method makes full use of CO₂in the air as the reaction driving source and overcomes the additional acid treatment in hydrothermal synthesis,which can increase the yield to 39%.Ag₂O nanoparticles were coated on the surface of the BaTiO₃ microspheres through chemical precipitation method.The morphology of the composite was regulated by adjusting the mass ratio of Ag/Ba,and then the performance of ferroelectric photocatalysis was investigated.The experimental research on the ferroelectric photocatalytic properties of BaTiO₃ shows that the BaTiO₃ coating with Ag₂O particles can broaden the range of photoresponse and increase the decolorization rate of simulated pollutants under visible light.At the same time,the piezoelectric properties and the pyroelectric properties of BaTiO₃ can promote the photocatalytic performance of Ag₂O/BaTiO₃ composite,whihc can make the decolorization rate of methyl orange reach 99%within 2 hours under visible light radiation.ZnO/BaTiO₃ composite powders were synthesized by sol-coating method and subsequent water bath.The composite microspheres with uniformly nanorods spread on its surfacen were synthesized by adjusting the coating times of ZnO sol and water-bath conditions.The obtained composite powder was tested for photocatalytic performance,and finally the decolorization rate of methyl orange could be achieved by 91%under 3 h xenon lamp irradiation.Moreover,The ZnO/BaTiO₃ was assembled into micro-nano generators to characterize the piezoelectric,pyroelectric and triboelectric output.The maximum output voltage and current value detected under piezoelectric mode is 7.5 V,83 nA.The current intensity of the pyroelectric and triboelectric output is 1.4?A and 1.0?A,respectively,which can light commercial LCDs and diodes,perform a certain degree of practical application value.