نتایج جستجو برای: rare materials
تعداد نتایج: 671388 فیلتر نتایج به سال:
a simple, sensitive and selective method for solvent extraction and spectrophotemetric determination of lanthanum (ii) europium (iii), and cerium (iii) is described , the rare earth metals are extracted into chloroform solution of n-phenylbenzohydroxamic acid (pbha) at ph 9-10 various parameters are studied to optimize the extraction conditions. the molar absorptivity is found to increase from ...
Rare earth is an important strategic resource in China, and it has the reputation of “industrial vitamin” industrial field. non-renewable. Due to diverse preparation methods rare oxides, different have their own advantages disadvantages. Using prepare nano-rare oxides. And because special electronic structure elements, optical, electrical magnetic properties. This article mainly introduces use ...
We investigate the mechanisms of fatigue behavior in nanocrystalline metals at the atomic scale using empirical force laws and molecular level simulations. A combination of molecular statics and molecular dynamics was used to deal with the time scale limitations of molecular dynamics. We show that the main atomistic mechanism of fatigue crack propagation in these materials is the formation of n...
Rare earth (RE) borohydrides have received considerable attention during the past ten years as possible hydrogen storage materials due to their relatively high gravimetric hydrogen density. This review illustrates the rich chemistry, structural diversity and thermal properties of borohydrides containing RE elements. In addition, it highlights the decomposition and rehydrogenation properties of ...
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