Hiroshi Takeuchi1, Shigeru Jyomura1, Etsuji Yamamoto1, Yukio Itô1
1Central Research Laboratory, Hitachi Ltd., Kokubunji, Tokyo 185 Japan
Tóm tắt
Electromechanical properties of PbTiO3 ceramics modified by the partial substitution of rare earths for Pb, particularly, (Pb, Ln) (Ti, Mn) O3 (Ln = La, Pr, Nd, Sm, or Gd) ceramics, are examined. It is found that the Sm substitution for Pb dramatically increases the ratio of electromechanical coupling factor of the thickness dilatational mode to that of the planar extensional mode. Extensive studies of the resonant properties of rectangular strip resonators make it clear that the Sm-substituted PbTiO3 ceramics are very useful for high-frequency array transducer applications. It is also shown that the pulse responses of array transducers can be improved using Sm substituted PbTiO3 ceramics instead of the other PbTiO3 ceramics studied here.
