Piezoelectricity of c-axis oriented PbTiO3 thin films

Kushida, Keiko; Takeuchi, Hiroshi
June 1987
Applied Physics Letters;6/22/1987, Vol. 50 Issue 25, p1800
Academic Journal
Through seeded lateral overgrowth, c-axis oriented PbTiO3 films are formed on patterned Pt electrode films that are on a SrTiO3 single crystal. The impedance characteristics are then measured for this sample as if it were a composite bulk wave resonator. A series of resonance and antiresonance characteristics is observed. Using a conventional circuit model, the electrical impedance is analyzed to evaluate the electromechanical coupling constant kt of the PbTiO3 films. It is found that kt is as large as 0.8.


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