Accession Number : AD0837404

Title :   RESEARCH ON HIGH POWER TRANSDUCER CERAMICS. STRESS SENSITIVITY OF PIEZOELECTRIC CERAMICS. PART FOUR: COMPARISON OF PB(ZR, TI)O3 COMPOSITIONS ON EITHER SIDE OF THE PHOMBOHEDRAL-TETRAGONAL PHASE BOUNDARY.

Descriptive Note : Technical rept.,

Corporate Author : CLEVITE CORP CLEVELAND OH ELECTRONIC RESEARCH DIV

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

Report Date : 08 JUL 1968

Pagination or Media Count : 37

Abstract : PST-4 and its equivalents form a good base from which to proceed with development of transducer ceramics that are less stress sensitive. A simple first step is to change the Zr/Ti ratio and measure stress sensitivity for different compositions. Ceramics far into the tetragonal field (4T), well into the rhombohedral field (4R), and very close to the phase boundary (4 phi) were prepared and tested. Compared with PZT-4 the 4T composition showed superior stability of permittivity and d33 with mechanical compression parallel to the poling direction (T3). Both 4R and 4T behave as 'hard' ceramics, i.e. very high compressive stresses are required to degrade permanently these materials. However, variations of properties with stress are high for 4R. Depolarization due to mechanical stress is severe with 4 phi. (Author)

Descriptors :   (*PIEZOELECTRIC TRANSDUCERS, CERAMIC MATERIALS), PIEZOELECTRIC CRYSTALS, STRESSES, SENSITIVITY, LEAD COMPOUNDS, TITANATES, ZIRCONATES, CRYSTAL STRUCTURE, CORRELATION TECHNIQUES, STRONTIUM COMPOUNDS, TEST METHODS, SOLID SOLUTIONS, PHASE STUDIES, FERROELECTRICITY.

Subject Categories : Ceramics, Refractories and Glass
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE