207Pb MAS NMR and conductivity identified anomalous phase transition in nanostructured PbF2 P. Thangadurai, S. Ramasamy and P. T. Manoharan Eur. Phys. J. B, 37 4 (2004) 425-432 Published online: 09 April 2004 DOI: 10.1140/epjb/e2004-00077-1