Accession Number : AD0811120

Title :   RESEARCH ON HIGH POWER TRANSDUCER CERAMICS. STRESS SENSITIVITY OF PIEZOELECTRIC CERAMICS: PART ONE: SENSITIVITY TO COMPRESSIVE STRESS PARALLEL 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 : 15 JAN 1967

Pagination or Media Count : 47

Abstract : Measurements of changes in permittivity, tan delta and D33 as function of compressive stress parallel to the polar axis are presented for lead zirconate-lead titanate transducer ceramics. The hard ceramics (PZT-4 and PZT-8) suitable for high power application show large changes of properties for stresses to 20 kpsi, but have good recovery on release of stress. The soft, donor-doped ceramics (PZT-5A and PZT-5H) suitable for detector applications show serious degradation with successive stress cycles. However, for peak stress below about 10 kpsi their variation of properties and hysteresis per cycle are less than those of the hard ceramics. Permittivity and tan delta of all these ceramics increase with increase of ac electric field. For the soft ceramics the tan delta increase is great enough to eliminate their consideration for uses where efficiency or cool operation are necessary. High ac electric fields combined with compressive stress reduces these detrimental increases for the soft ceramics and increases them for the hard ceramics. Nevertheless, the hard ceramics remain far superior for high power, high stress uses.

Descriptors :   (*DIELECTRIC PROPERTIES, STRESSES), (*PIEZOELECTRIC CRYSTALS, COMPRESSIVE PROPERTIES), CERAMIC MATERIALS, TITANATES, ZIRCONIUM ALLOYS, LEAD ALLOYS, DOPING, TRANSDUCERS, HYSTERESIS.

Subject Categories : Electrical and Electronic Equipment
      Ceramics, Refractories and Glass
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE