In Situ Measurements of Changes of Ferromagnetism Caused by High Pressure Gaseous Hydrogen
Considerable changes in the magnetic moments of metallic components can be caused by the action of high-pressure gaseous hydrogen during the formation and decomposition of hydrides. This is the case especially with nickel and nickel-iron alloys which are ferromagnetic in hydrogen-free states. The possibility of changing the spontaneous magnetization can be used to analyze interesting thermodynamic aspects such as the kinetics of formation and decomposition of hydrides or basically to prove their existence. Accordingly, interest should be given to magnetic measurements carried out under high-pressure conditions. As the available working volumes are of the order of only a few cm3, a miniaturization of the magnetic devices used under normal conditions is required. Moreover, the inaccessibility of the working area in the highpressure apparatus requires a measuring device which must be as simple as possible.
KeywordsHydrogen Pressure Induction Coil Spontaneous Magnetization Hydride Phase Magnetic Device
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