Phase transformation in Pb:GeSbTe chalcogenide films J. Kumar, P. Kumar, M. Ahmad, R. Chander, R. Thangaraj and T. S. Sathiaraj Eur. Phys. J. Appl. Phys., 44 2 (2008) 117-123 Published online: 21 October 2008 DOI: 10.1051/epjap:2008165