Accession Number : ADA132262

Title :   Targeted Basic Studies of Ferroelectric and Ferroelastic Materials for Piezoelectric Transducer Applications.

Descriptive Note : Final rept. 1 Dec 81-31 Dec 82,


Personal Author(s) : Cross,L E ; Newnham,R E ; Barsch,G R ; Biggers,J V

Full Text :

Report Date : Mar 1983

Pagination or Media Count : 322

Abstract : The report delineates the new progress made in the fifth and final year and discusses the major accomplishments of the full five year program both in the basic science and in the spin off to practical transducer applications. Possible new areas of study which are suggested by the present studies are briefly reported. Major achievements include the development of a physical approach to understanding active composites, leading to the development of several new families of PZT:polymer piezoelectric composites for hydrophone application. New advances in the phenomenology and microscopic theory of electrostriction, and the evolution of a new family of high strain ferroelectric relaxor materials for practical application. New basic understanding of the polarization mechanisms in ferroelectric relaxors has been aided by the study of order-disorder of the cation arrangement in lead scandium tantalate, and the results correlate well with studies of relaxor behavior, and of shape memory effects in PLZT ceramics. Low temperature studies on pure and doped PZTs have given the first clear indication of the intrinsic (averaged) single domain response and correlate exceedingly well with earlier phenomenological theory. Crystal growth and ceramic processing studies have developed hand-in-hand with program needs providing new forms of conventional materials, new grain oriented structures and single crystals.

Descriptors :   *Piezoelectric materials , *Piezoelectric transducers , Elastic properties , Electrostriction , Dielectric properties , Composite materials , Pyroelectricity , Ferroelectric crystals , Thermodynamic properties , Ceramic materials , Crystal growth , Lead(Metal) , Scandium , Tantalates , Single crystals , Low temperature , Polymers , Hydrophones

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE