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Dielectric and Electromechanical Properties of PbTiO3-La(Zn2/3Nb1/3)O3 Solid Solution Ceramics

Solid solutions in the PbTiO3-La(Zn2/3Nb1/3)O3 system are formed with a perovskite structure up to 70 mol% of La(Zn2/3Nb1/3)O3 content. Dielectric and electromechanical properties of the ceramics have been measured as functions of temperature. The ferroelectric Curie temperature decreases linearly with increasing La(Zn2/3Nb1/3)O3 content. The planar coupling factor kp at room temperature shows a maximum of 23% in the composition with 13 mol% of La(Zn2/3Nb1/3)O3. A minimum of the temperature coefficient of the planar resonance frequency |Δf/fΔT| at room temperature (∼3.7×10-5 K-1) is obtained at 10.5 mol% of La(Zn2/3Nb1/3)O3. By adding a small amount of MnO2 to the ceramics, the order of magnitude of |Δf/fΔT| can be reduced to ∼10-6 K-1.