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The Preparation and Properties of Nanosized Thulium Hydride and Nanosized Thulium

Author: LiuXiaoMing
Tutor: FanYinHeng；DanWenJuan
School: Liaoning Normal University
Course: Physical and chemical
Keywords: nanosized thulium hydride nanosized thulium preparation and properties nanosized aluminium
CLC: TB383.1
Type: Master's thesis
Year: 2008
Downloads: 6
Quote: 0
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Abstract


Content:1.Nanosized thulium hydride was first successfully synthesized by using catalytic method,halogenated hydrocarbon solicitation method and metal activation method under mild conditions.The product was characterized by using XRD,TEM and BET methods.XRD patterns of thulium hydride,which was synthesized by using catalytic method,were identified to have hexagonal structures,and the molecular structure was TmH2.87.The rest was cubic crystal structures,the molecular structure was TmH2.The average particle sizes calculated from XRD images by Scherrer formula are 30 nm,14 nm and 15 nm respectively,which are in agreement with the results from TEM images.And they had large specific areas of 11.0 m2/g,13.6 m2/g and 36.6 m2/g correspondingly.The result of the nitriding experiment of nanosized thulium hydride indicated that nanosized thulium hydride does not react with N2 at atmosphere temperature,but the reaction took place at 200℃.XRD pattern showed the data can’t consistent with JCP2 card,but repetitious data are same.So we considered it’s a new product.The average particle size calculated from XRD images by Scherrer formula is 15 nm.2.A simple and easy way was reported to prepare nanometric thulium powder by the thermal decomposition of organo-thulium under vacuum. The results of the hydrogenation and nitriding experiments of nanosized Tm indicated that nanosized Tm can react with H2 at atmosphere temperature and normal pressure.XRD pattern showed that the product was thulium hydride with mixture crystal structures of cubic and hexagonal system.The average particle size calculated from XRD images by Scherrer formula is 19 nm.And it has a large specific area of 22.8 m2/g. The average particle size calculated from XRD images of nitriding product by Scherrer formula is 13 nm,which are in agreement with the results from TEM images.3.Under the base of discussion and repeated experiments, Organo-aluminium intermediate was prepared by using coordination catalysis method and halogenated hydrocarbon solicitation method under mild conditions.Heat instability of the intermediate was considered to prepare nanosized aluminium by vacuum pyrogenation for it.The average particle size calculated from XRD images of nanosized aluminium by Scherrer formula is 30 nm,which are in agreement with the results from TEM images.And they had a large specific area of 33.8 m2/g.

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