Procedure for the characterisation of piezoelectric samples in non-standard resonant modes

The standard characterisation of piezoelectric materials requires specific boundary conditions. However the piezoelectric devices require quite differ ent shaped materials and contour conditions from those that standard impose s. For these reasons, device characterisation usually requires models of eq uivalent electric circuits for non-electric properties as mechanical losses or coupling factors. Using a piezoelectric resonator model, similar to tha t used in the standard, we can make a more accurate characterisation of pie zoelectric devices. (C) 1999 Elsevier Science Limited. All rights reserved.