Thin films of tungsten phosphate glasses were deposited on a Pd substrate by a

pulsed laser deposition method and the flux of hydrogen passed through the glass

film was measured with a conventional gas permeation technique at 300 to 500C.

The glass film deposited at low oxygen pressure was inappropriate for hydrogen

permeation because of reduction of W ions due to oxygen deficiency. The

membrane used in the hydrogen permeation experiment was a 3-layered membrane

and consisted of Pd film (~20nm), the glass film (≤300nm) and the Pd substrate

(250μm). When the pressure difference of hydrogen and thickness of the glass

layer were respectively 0.2MPa and ~100nm, the permeation rate through the

membrane was 2.0 x 10−6mol/cm2s at 500C. It was confirmed that the protonic and

electronic mixed conducting glass thin film showed high hydrogen permeation rate.

Hydrogen Permeation of Tungsten Phosphate Glass Thin Films. H.Tawarayama,

H.Kawazoe, H.Hosono: Solid State Ionics, 2009, 180[6-8], 556-9