Piezoelectric ceramics of the PbTiO₃-La(Me_2/3Nb_1/3)O₃ (Me: Mg, Zn) solid solution system

Shoichiro Nomura Department of Physical Electronics, Tokyo Institute of Technology Ookayama, Meguro-ku, Tokyo, 152, JAPAN

Kumiko Kaneta Department of Physical Electronics, Tokyo Institute of Technology Ookayama, Meguro-ku, Tokyo, 152, JAPAN

Jun Kuwata Department of Physical Electronics, Tokyo Institute of Technology Ookayama, Meguro-ku, Tokyo, 152, JAPAN

Kenji Uchino Department of Physical Electronics, Tokyo Institute of Technology Ookayama, Meguro-ku, Tokyo, 152, JAPAN

Abstract

Solid solutions with a perovskite structure are formed in the PbTiO₃-La(Me_2/3Nb_1/3)O₃ (Me:Mg,Zn) systems up to about 70 mol% of La(Me₂Nb_1/3)O₃. Structural, dielectric, electromechanical and dilatational properties of the ceramics have been measured as functions of composition and temperature. The electromechanical coupling constants k_p and k_t at room temperature are 28% and 68%, respectively, in the composition near 10 mol% of La(Mg_2/3Nb_1/3)O₃. The temperature coefficient of the radial mode resonance frequency less than I ppmK₋₁ is obtained in the vicinity of 10 mol% of La(Me_2/3Nb_1/3)O₃ with a small amount of MnO₂ additive.

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Piezoelectric ceramics of the PbTiO₃-La(Me_2/3Nb_1/3)O₃ (Me: Mg, Zn) solid solution system

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Piezoelectric ceramics of the PbTiO3-La(Me2/3Nb1/3)O3 (Me: Mg, Zn) solid solution system

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Piezoelectric ceramics of the PbTiO₃-La(Me_2/3Nb_1/3)O₃ (Me: Mg, Zn) solid solution system