Elastic Modulus and Mechanical Loss Associated with Phase Transitions and Domain Walls Motions in PZT Based Ceramics E.M. Bourim, H. Idrissi, B.L. Cheng, M. Gabbay and G. Fantozzi J. Phys. IV France, 06 C8 (1996) C8-633-C8-636 DOI: 10.1051/jp4:19968136