The deuterium permeation behaviour of erbium oxide coatings fabricated by filtered arc deposition on reduced activation ferritic/martensitic steels was investigated. The samples coated on both sides of the substrates showed remarkably lower permeability than those coated on one side, and the maximum reduction efficiency indicated a factor of 105 compared with the substrate. The different permeation behaviour between the coatings facing the high and low deuterium pressure sides was found by the crystal structure analysis and the evaluation of the energy barriers. It was suggested that the permeation processes on the front and back surfaces were independent, and the TPB efficiency of the samples coated on both sides can be expressed by a multiplication of that of each side.

Surface Behaviour in Deuterium Permeation through Erbium Oxide Coatings. T.Chikada, A.Suzuki, C.Adelhelm, T.Terai, T.Muroga: Nuclear Fusion, 2011, 51[6], 063023