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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 >Monitoring of hydrogen absorption/desorption into pressed cobalt powder using resistometry
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Monitoring of hydrogen absorption/desorption into pressed cobalt powder using resistometry

机译：使用电阻法监测压制钴粉中的氢吸收/解吸

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The kinetics of hydrogen absorption/desorption into pressed cobalt powder samples was monitored using resistometry. The samples were prepared by pressing Co powder at 100MPa and t=25℃. The equivalent diameter of the species varied from 5 to 200μm. The study showed that hydrogen absorption leads to an increase in the electrical resistivity of the pressed samples. During diffusion into the crystal lattice, the absorbed hydrogen atoms simultaneously trap an electron from the conduction band of the metal and form H~- ions, consequently inducing an increase in the electrical resistivity of the pressed sample. On the basis of the change in resistivity, a mechanism of hydrogen absorption has been proposed. During the initial period of absorption, the hydrogen absorption reaction is limited by the dissociative adsorption of hydrogen over a short period of time, following which the diffusion of H~- ions into the bulk of the pressed Co powder is identified as the rate-determining step. The hydrogen desorption rate in an argon atmosphere is limited by H_(2,ad) formation; recombination of adsorbed hydrogen atoms, H_(ad), or by the diffusion of H~- ions from the crystal lattice over a prolonged period of time.
机译：使用电阻测定法监测压制钴粉样品中氢吸收/解吸的动力学。通过在100MPa和t = 25℃下压制Co粉来制备样品。物种的当量直径从5到200μm不等。研究表明，氢的吸收导致压制样品的电阻率增加。在扩散到晶格期间，被吸收的氢原子会同时从金属的导带中捕获电子并形成H +离子，从而导致压制样品的电阻率增加。基于电阻率的变化，提出了氢吸收的机理。在吸收的最初阶段，氢吸收反应受到氢在短时间内的解离吸附的限制，此后，氢离子在压制的钴粉中的扩散被确定为速率的决定因素。步。氩气中氢气的解吸速率受H_（2，ad）形成的限制;吸附的氢原子H_（ad）的复合或长时间内氢离子从晶格中的扩散。

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