“…Because of their environment-friendliness, refractoriness, and chemical stability, these phosphates have been used as binders of refractory ceramics [16][17][18][19], sealants of plasma-sprayed oxide coatings [20,21], and anti-corrosion/oxidation coatings [18,22,23]. The permeability of hydrogen isotopes, however, has 0920-3796/$ -see front matter © 2010 Elsevier B.V. All rights reserved.…”