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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Analysis of the nanopores produced in nickel and palladium by high hydrogen pressure
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Analysis of the nanopores produced in nickel and palladium by high hydrogen pressure

机译：高压下镍和钯中产生的纳米孔的分析

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摘要

Samples of pure nickel and palladium were submitted to a high hydrogen pressure (HHP) of 3.5 GPa at 800 deg C for 5 h. Analysis of the resulting structural modification was performed using X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM) and small-angle x-ray scattering (SAXS), the latter specifically for Ni. The formation of superabundant vacancies (SAVs) was observed in the structure in both cases. For Pd, the pores, which formed by the coalescence of vacancies, had dimensions of 20-30 nm when present in the interior of the metal and 1-3 mu m when condensed at the surface. The pores were seen to be dispersed homogeneously across the surface of Pd. For Ni, however, pores were created preferentially at the grain boundaries, which promoted significant decohesion in the metal. The distribution of pores induced by heat treatment of Ni subjected to HHP was determined by SAXS analysis and two populations of pores, with population mean diameters of 50 and 250 A, were observed.
机译：将纯镍和钯样品在800摄氏度下经受3.5 GPa的高氢压（HHP）5小时。使用X射线衍射（XRD），扫描和透射电子显微镜（SEM和TEM）以及小角度X射线散射（SAXS）（后者专门用于Ni）对所得结构修饰进行分析。在这两种情况下，均在结构中观察到过剩空位（SAV）的形成。对于Pd，由空位的聚结形成的孔在金属内部存在时的尺寸为20-30 nm，在表面凝结时的尺寸为1-3μm。看到孔均匀地分散在Pd的整个表面上。但是，对于镍，优先在晶界处形成孔，这会促进金属中的显着脱粘。通过SAXS分析确定了经过HHP的Ni热处理引起的孔分布，并观察到两个孔的平均直径分别为50和250A。

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