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Preparation Of Nano BaTiO3 And TiO2

Posted on:2009-10-05Degree:MasterType:Thesis
Country:ChinaCandidate:Y F WangFull Text:PDF
GTID:2131360308478951Subject:Physical chemistry
Abstract/Summary:PDF Full Text Request
Synthesizing nanometer-materials with different morphology and structure, searching stable and reliable preparation method, developing the new material with excellent properties, are the present study focus in the field of materials science, chemistry, physics, etc. In this paper, nanometer-sized BaTiO3 and TiO2 powders were synthesized by improved method of routine oxalate coprecipitation and high temperature-energy ball milling method. In addition, the product performance and the synthesis mechanism also were investigated.Improving on the routine oxalate coprecipitation method, chosing the Ba(NO3)2,C36H70O4Ba and H2C2O4 as raw material, controlling pH value of research liquor, regulating the laying temperature and laying time of barium oxalate complex compound, chosing the good dispersant agent are mainly works. Analyzing the influence of those crafts condition upon the powder body function, to get the best preparation technology parameter and results are pH≈3, laying temperature at 80℃, laying time for 4h, the dispersant agent of ethylene alcohol. According to the TG-DTA curves, the hot decomposition of barium oxalate complex compound was determined, and the reasonable calcinations temperature of powers body was maked at 900℃.The materials were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), laser particle size analysis (LPA) and infrared spectrometric analyzer (FTIR).The results showed: after improving, the pH value of whole mixed liquor no longer vary along with precipitate reaction is going. Comparing to before of improved method, prepared BaTiO3 powers are pure, the size is even and has good dispersion propertity.BaTiO3 powers were prepared by high temperature-energy ball milling from three comparisons of different reaction systems, raw materials, methods.The results showed:synthesis of nanometer compound powders by high temperature-energy ball milling method had many advantages, such as simple preparation process, short period of the experimental procedure, the chemical reaction could be taken place easily at low temperature, and so on.A anatase TiO2 nanocryst at lower temperature of 350℃was also prepared by high temperature-energy ball milling. The photocatalytic activity of nanometer TiO2 powders were studied by degrading the solution of methylene blue which was irradiated by the high-voltage mercury lamp. The degradation rate of methylene blue got to 86% after irradiated two hours.
Keywords/Search Tags:BaTiO3, nanometer, oxalate coprecipitation method, TiO2, high temperature-energy ball mill
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