Accession Number : AD0816427

Title :   RESEARCH ON HIGH POWER TRANSDUCER CERAMICS. STRESS SENSITIVITY OF PIEZOELECTRIC CERAMICS. PART THREE: SENSITIVITY TO COMPRESSIVE STRESS PERPENDICULAR TO THE POLAR AXIS.

Descriptive Note : Technical rept.,

Corporate Author : CLEVITE CORP CLEVELAND OH ELECTRONIC RESEARCH DIV

Personal Author(s) : Krueger, Helmut H. A.

Report Date : 26 JUN 1967

Pagination or Media Count : 33

Abstract : Measurements are reported of the change in permeability, loss, and the piezoelectric constants, d31 and d32 for piezoelectric ceramic transducer materials subjected to high stress perpendicular to the polar axis (T1). Ceramics useful for high power applications (PZT-4 and PZT-8) and some donor-doped ceramics of high sensitivity but with high losses that make such applications unwise (PZT-5A and PZT-5H) were tested. Permeability generally decreased with stress, T1, opposite to results with parallel stress, T3. The piezoelectric coefficient d31 (in the direction of stress application) decreases markedly with stress, while d32 (in the direction perpendicular to the stress and the polarization) generally rises. The effects are less severe for the 'hard' ceramics. A permanent change in pseudo crystal symmetry from infinity m to 2mm is observed for the donor-doped ceramics, even at relatively low stress levels (5 kpsi). (Author)

Descriptors :   *PIEZOELECTRIC TRANSDUCERS), (*PIEZOELECTRIC CRYSTALS, PERMEABILITY(MAGNETIC), SHEAR STRESSES, CYCLIC RATE, DOPING, SYMMETRY(CRYSTALLOGRAPHY), COMPRESSIVE PROPERTIES, CERAMIC MATERIALS.

Subject Categories : Electrical and Electronic Equipment
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE