The depth profiles of 1H and 2D in rapidly-grown KD2xH2(1–x)PO4 single crystals were studied by means of elastic recoil detection. The results showed that, under ambient conditions, deuteration within the first ~500nm from the sample surface significantly decreased within the first few days after D2O surface polishing. This was attributed to D–H exchange. The effective diffusion coefficient for this process depended strongly upon the degree of deuteration and upon the sample growth conditions.

Hydrogen–Deuterium Exchange in KD2PO4. S.O.Kucheyev, T.E.Felter, W.J.Siekhaus, A.J.Nelson, A.V.Hamza: Applied Physics Letters, 2004, 84[8], 1344-6