Accession Number:

ADA036701

Title:

Investigations of Materials for Possible Use as Electromechanical Transducer Elements.

Descriptive Note:

Final rept.

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK

Personal Author(s):

Report Date:

1953-10-01

Pagination or Media Count:

370.0

Abstract:

Optical, dielectric and structural studies have been carried out on NaNbO3 and the solid solution Na,KNbO3, using both single crystals and ceramics. A low-temperature adiabatic calorimeter of the Nernst type has been constructed for specific heat and entropy measurements of phase transitions. An acoustical tank, for electro-acoustic transducer efficiency measurements has been designed and constructed. Phase studies of other perovskite-type compounds of the BaTiO3 group are reported, including phase analyses of PbHfO3 and related mixed crystals. Phase studies of compounds in the pyrochlor group, including Cd2Nb2O7, Pb2Nb2O7 and mixed crystals of these, are also presented. A survey is included of experimental and theoretical research on ferroelectric crystals, which outlines knowledge of all known ferroelectrics up to 1952. Three translations of significant Russian publications on ferroelectricity are appended. A history of the present program, and suggestions as to probable fruitful directions for future research, are presented.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Acoustic Detection and Detectors
  • Crystallography
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE