Abstract
Crystallographic and low frequency dielectric studies were performed on new lead-free ceramics derived from BaTiO 3 by cationic substitutions in the 12 C.N. crystallographic site and having the composition Ba 1− x K x /2 La x /2 TiO 3 or Ba 1− x A 2 x /3 TiO 3 (A=La, Bi). A classical ferroelectric behaviour was shown for compositions close to BaTiO 3 , while a relaxor one occured when the composition deviated from BaTiO 3 . In any case, the value of T C (or T m ) and the relaxor characteristics are higher as x increases. Concerning potassium-free ceramics, bismuth compositions compared with lanthanum ones favoured both high ferroelectric and relaxor characteristics due to the lone pair of Bi 3+ . Such new materials are of interest for environmental friendly applications.
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