Influence of the crystallite size on the phase transformation of yttria irradiated with swift heavy ions S. Hémon, A. Berthelot, Ch. Dufour, F. Gourbilleau, E. Dooryhée, S. Bégin-Colin and E. Paumier Eur. Phys. J. B, 19 4 (2001) 517-523 Published online: 15 February 2001 DOI: 10.1007/PL00011090