The diffusive behavior of 99Mo was studied. The results could be described by:

polycrystalline (2100-2400C):     D (cm2/s) = 3.7 x 10-3 exp[-110.0(kcal/mol)/RT]

monocrystalline (2000-2400C):     D (cm2/s) = 5.0 x 10-2 exp[-121.0(kcal/mol)/RT]

V.D.Lyubimov, P.V.Geld, G.P.Shveikin, Y.A.Sutina: Izvestiya Akademii Nauk SSSR, 1967, 2, 84-7