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Precise measurements of hydrogen permeation through highly purified iron have been performed utilizing the gaseous permeation technique with the hydrogen pressure ranging between 0.001 and 0.1 MPa in a wide temperature range from 420 to 1100K. The effect of surface oxide and/or lattice imperfections on hydrogen transport has also been investigated by changing the impurity level of hydrogen gas or by introducing the lattice imperfections due to deformation of the specimen without

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