The diffusion of B at temperatures of between 900 and 1200C was measured by means of particle tracking auto-radiography. The results (table 120) could be described by:

D (m2/s) = 2.6 x 10-7 exp[-26.5(kcal/mol)/RT]

W.Wang, S.Zhang, X.He: Acta Metallurgica et Materialia, 1995, 43[4], 1693-9