The methods of measurement described in this European Standard are for use with
piezoelectric components produced from the ceramic materials described in EN 50324-1
“Terms and definitions”. Methods of measurement for specific dielectric, piezoelectric and
elastic coefficients are generally applicable to piezoelectric ceramics.
The polycrystalline nature of ceramics, statistical fluctuations in composition and the influence
of the manufacturing process, result in specified material coefficients being typical mean
values. These values are provided for design information only.
Piezoelectric transducers can have widely differing shapes and may be employed in a range of
vibrational modes. Material parameters however, are measured on simple test-pieces (discs,
rods etc. see EN 50324-1, Figure 2) using specific geometric and electrical boundary
conditions. Consequently, the results of the tests provide basic material parameters only and
must only be used as a guide to the actual properties of manufactured commercial
components.