Tin-mordenites were prepared by heating H-mordenite mixed with tin(II) chloride dihydrate in an oxygen atmosphere. Tin was ion exchanged into the mordenites with up to 3.6 molecules per unit cell. Excess tin(II) chloride was oxidized to tin(IV) oxide by oxygen. The ac and dc conductivities were measured in atmospheres with different water partial pressures. The conductivity measurements showed that the tin exchanged mordenites were proton conductors, that the conductivity was very dependent of the water content, but that the dehydration was reversible. The conductivity increased with increasing tin content until full ion exchange whereafter it remained virtually constant. Tin(IV) oxide in the preparates gave rise to additional grain boundary conduction. The highest conductivity measured was 0.6 x 10-1S/cm at 120C in a water-saturated atmosphere.

Tin-Mordenites, Syntheses and Ionic Conductivity. N.Knudsen, E.Krogh Andersen, I.G.Krogh Andersen, E.Skou: Solid State Ionics, 1989, 35[1–2], 51–5