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Hydriding and Dehydriding Characteristics of Mechanically Alloyed LaMg_(17) Ni Composite Material

Journal of Rare Earths 2003年第3期21卷 337-340页

作者：李谦蒋利军林勤周国治詹峰郑强魏秀英 Research Center of Energy materials and Technology General Research Institute for Nonferrous Metal Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 China Department of Physical Chemistry University of Science and Technology Beijing

A composite material with the nominal composition LaMg 17 Ni was synthesized by mechanical alloying and the hydriding/dehydriding (H/D) behaviors of this material were studied at several temperatures. This material has a hydrogen storage capacity (5.76% H 2, mass fraction) lower than conventionally alloyed La 2Mg 17 (6.63% H 2, mass fraction) without activation but shows a superior hydriding/dehydriding kinetic property. At 523 K it absorbed 4.97% (mass fraction) in less than 1 min , approximately 100 times faster than La 2Mg 17 alloy under the same conditions. This attractive kinetic property of the alloy can be ascribed to the catalytic action of Mg 2Ni, LaH 2 and La as well as the multiphase structure formed in the preparation processes. The relationships between the equilibrium plateau pressure and the temperature can be expressed as lg p eq =-2797/ T +4.267 (553 K≤ T ≤623 K) for hydriding and lg p eq =-3957/ T +6.063(553 K≤ T ≤623 K) for dehydriding.

关键词： function materials hydrogen storage alloys La Ni Mg mechanical alloying rare earths

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Syntheses, characteristics, and fluorescence properties of complexes of europium with benzoic acid and its derivatives

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Rare Metals 2004年第4期23卷 306-310页

作者： ZHOUZhongcheng SHUWangen RUANJianming HUANGBoyun LIUYounian StareKeyLaboratotyforPowerMetallurgy CentralSouthUniversityChangsha410083China CollegeofChemistryandChemicalengineering CentralSouthUniversityChangsha410083China

The binary complexes of europium with benzoic acid and its derivatives(phthalic acid, m-phthalic acid, o-aminobenzoic acid, salicylic acid, and sulfosalicylic acid) weresynthesized and their compositions were identified by elemental analyses. UV and IR of the complexeshave been investigated. The UV spectra indicated that the complexes' ultraviolet absorption weremainly the ligands' absorption. The IR spectra showed that the IR spectra of complexes are differentfrom those of free ligands. The fluorescence properties of them were investigated by usingluminescence spectroscopy, the results showed that only three complexes appear as betterluminescence, they were Eu-benzoic acid, Eu-m-phthalic acid and Eu-phthalic acid, while the othersexhibited the ligands' wideband emission.

关键词： function materials rare earth complexes luminescence spectroscopy benzoicacid fluorescence properties

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