Dielectric relaxation anal microwave loss in the La(Mg1/2Ti1/2)O3-(Na1/2Bi1/2)TiO3 perovskite ceramics - Salak, AN; Ferreira, VM; Vieira, LG; Ribeiro, JL; Pullar, RC; Alford, NM (JOURNAL OF MATERIALS RESEARCH, 2007)