Piezoelectric thin films of rf-sputtered Bi12PbO19

Abstract
Thin films of Bi12PbO19, one of the γ‐Bi2O3 family, were prepared on glass and Si substrates by rf sputtering. Films of γ‐phase Bi12PbO19 were obtained at the substrate temperature of 450–600 °C. The films were found to be highly oriented with the 〈310〉 axis normal to the substrate surface and exhibited piezoelectricity. The electromechanical coupling factors for the longitudinal mode measured were 0.16–0.22 with the phase velocities of 3600–3800 m/sec.