Preparation Of Barium Strontium Titanate Materials And The Response Performance Of The Electric Field

The aim of the paper is to produce the intelligent materials.Based on this,different barium strontium titanate /gelatin/ glycerin water elastomers were prepared with or without dc electric field respectively,because barium strontium titanate,as a kind of dielectric material,was suggested to respond to electric field with changing of the structure and capability.The nanoparticle Ba_0.8Sr_0.2TiO₃ and nanoflake Ba_0.8Sr_0.2TiO₃ were prepared by simple moderation original method which is amity for environment. In order to selecting the materials with stronger response in dc electric field,the mechanical properties of the elastomers were described as the Stress-Strain curve varing with a series of factors.A good ER property and a simple preparation method of Photonic cyrsatsl will be developed.The main results of this dissertation are shown as follows:1.Tartaric acid and ethylenediamine tetraacetic acid EDTA were used as multiple chelation,and Barium nitrate Ba(NO₃)₂,strontium nitrate Sr(NO₃)₂,tetrabutyl titanate Ti(OC₄H₉)₄,ammonia NH₃·H₂O were used as raw materials,Ba_0.8Sr_0.2TiO₃ ceramic powders were prepared by sol-gel chelation precursor and low-temperature combustion synthesis method.The results of XRD,SEM and TEM showed that Ba_0.8Sr_0.2TiO₃ powders manifest good crystal,purity and identical size particles when pH value of solution is 7,the molar ratio of tartaric acid to metal ions is 1.5, and the treatment temperature is 650℃.The average particle diameter is about 40 nm.2.Using DL-α-alanine as a raw material,Ba_0.8Sr_0.2TiO₃ irregular shape and ruleless powers were prepared by a simple original method.The caloric volvement course of the precursor was characteried by TG-DSC,structure and phase formation of the productions were characteried by XRD and SEM.The results showed that ammonium nitrate was indispensable for preparation of Ba_0.8Sr_0.2TiO₃ nanoflake, and the prime treatment temperature is 650℃.3.Ba_0.8Sr_0.2TiO₃ nanoflakes were dispersed into aquaous gelatin/glycerin system by chemical and physical methods,two sorts of composite elastic hydrogels were obtained with or without external electric field.The particle concentration,the strength of external electric fields,gel-forming time and the structure and shape of dispersing particles,which influenced on the mechanical properties of composite gels,have been studied by XRD,SEM,and the test of Stress-Strain variety.The results showed that a good property of the composite elastic hydrogels will be developed with dispersed granule is BST(650),a particle weight fraction is 1.3 wt%, and the field intensity is 1.2 kV/mm for 30 min.It considered that the influences on the response behavior to an applied electric field got more stronger when the thickness of the dispersed particles was thinner and the particle's purity was better.4.When four kinds of Ba_0.8Sr_0.2TiO₃ particles were dispersed into aquaous gelatin/glycerin system,two sorts of composite elastic hydrogels were obtained with or without external electric field,and the Stress-Strain varieties of the elastomers were described.The results showed that:(1) a good property will be developed when electric field is applied.(2) The stronger compress properties have been found when the size of dispersed granule was microns.