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Solution-based Synthesis of Functional (Oxy) Fluorides and Its Characterizations

Author: ShengJie
Tutor: TangKaiBin
School: University of Science and Technology of China
Course: Inorganic Chemistry
Keywords: Fluoro - ( oxy) compounds Functional Materials Hydrothermal Solvothermal Nanostructure Superconductivity Photocatalytic Photoluminescence
CLC: TB383.1
Type: PhD thesis
Year: 2009
Downloads: 186
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Abstract


Recent years, fluorine (oxygen) the compounds functional materials because of their superconductivity, magnetic materials, catalysis, and electroluminescent materials become a research hotspot in recent years. The main purpose of this paper is to use the liquid-phase chemical routes to functional materials for preparation of the compounds of fluorine (oxygen). Through the study of the reaction process, the ScS process for preparing a variety of reaction conditions, to achieve the best optimization purposes. Testing, research structure, morphology and its physical nature of the link between the performance of the resulting fluorine compounds (oxygen) Functional Materials, prepared by fluorine (oxygen) compounds have a better physical and chemical properties. The main contents are summarized as follows :: 1. Use NH4HF a source of fluorine, solvothermal synthesis Sr in 2 the CuO 3 and NdSr 2 Cu 2 0 6-δ Cu oxides fluorinated. Anhydrous ethanol as solvent, thereby avoiding the failure caused due to the Cu-based oxides are sensitive to water. By comparison experiment, a more optimized preparation conditions for such reactions are summarized. Structural analysis showed the Sr 2 the the CuO 3 and NdSr 2 Cu 2 0 6-8 after cold treatment, in their structure changes, get the copper base Oxyfluoride a metastable phase. The fluorine compounds (oxygen) superconductivity by its performance in the zero field cooled magnetic analysis results show that, Sr 2 Cu (O, F) 4 δ transition temperature of 38K NdSr 2 Cu delta 6 2 (O, F) presented a smooth magnetic behavior. Fluorinated copper-based oxide has not been reported previously, the result is better than using NH4HF2 do other methods for preparing the fluorine source. Use a variety of solvents, as a raw material to Ti powder or TiO 2 solvothermal conditions successfully prepared the K 2 the TIF 6 K 2 TioF 4 , K 3 TIOF 5 and K 7 Ti < sub> O 4 F 7 series of fluorine compounds of (oxygen) micro-crystals. Study on the type of solvent in the reaction, has an important effect of the solvent used for the formation of phase. Through a series of the prepared fluorine (oxygen) of the composition are ScS the four material has a specific surface area is very small; but showed more intense absorption in the ultraviolet region, especially the K 2 TioF < sub> 4 is still visible region wide strong absorption: A preliminary study of the photocatalytic properties of the compounds of fluorine (oxygen), results showed that UV irradiation under product RhB photodegradation exhibit excellent catalytic performance, especially the K 2 TioF 4 of activity, and decreased in the visible light RhB solution capacity of more than P25 (TiO for 2 ). In order to further improve activity K2TiOF4, we also have control of reaction conditions to achieve this material Nanostructures. The octahedron, spherical, rod-like and hollow ball nanostructures K the 2 TioF 4 is changed a response to arguments that the solvent. Also studied the impact of the acid system, alkaline phase is formed by experiment, the suitable pH value of about 7-8. Examine their specific surface area were significantly improved. The same light absorption of the hollow sphere nanostructures and photocatalytic performance study, the results show that the large surface area of ??the hollow structure helps K 2 TiOF 4 catalytic activity and luminescent properties improved. 3 using PEG-assisted hydrothermal method the perovskite structure KMnF 3 of microstructure control synthesis, microcrystalline polyhedron, microspheres and hollow sphere in a controlled conditions. Influence of PEG product indicates that the the PEG type is key to the type of micro-structure. The combination of PEG concentration, reaction temperature, time and other parameters, to a curable Ostwold Formation Mechanism. Were characterized by absorption and luminescence properties of the resulting micro-structural materials, has the strong absorption KMnF3 is an excellent light-emitting materials. Synthesized under solvothermal conditions by using the DMF the nanostructures BAF 2 , the investigation of the reaction time to study the morphology changes from a single nanoparticle square microchip. Test the the BAF 2 nano-particles of light-emitting performance by comparison with the bulk material, found that nano-sized the BAF 2 emission peak performance stronger and blue shift and the width of the phenomenon.

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