Effect of Nb Doping on the Microstructural and Electrical Properties of the PZT Ceramics M. Pereira, A.P. Barranco, A.G. Peixoto, M.J.M. Gomes , & F.P. Caldéron “International Conference on Electroceramics VII-2000”, 3-6 de Setembro de 2000, Portoroz, Eslovenia.