Accession Number : AD0257823

Title :   EFFECTS OF RADIATION ON FERROELECTRIC AND FERRIMAGNETIC MATERIALS. PART I. FERROELECTRIC MATERIALS

Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s) : WRIGHT,L.G. ; ROSEN,C.A. ; TAIMUTY,S.I.

Report Date : 01 MAY 1961

Pagination or Media Count : 1

Abstract : The effects of reactor radiation and Co-60 gamma raduatuib on the dielectric properties of 4 ceramic ferroelectric materials (BaTiO3, 96% BaTiO3 plus 4% PbTiO3, 95% BaTiO3 plus 5% CaTiO3, and 56% PbZrO3 plus 44% PbTiO3) were studied. Complex permittivity and large-signal hysteresis properties were measured before and after irradiation, after room temperature aging, and after 500 C heat treatment. The effects on the dielectric constant were small after fast-neutron exposures below 10 to the 18th power n/sq cm. After 10 to the 18th power n/sq cm, decreases in the values of the dielectric constants were observed with the passage of time. The total hysteresis loss at constant maximum electric displacement increased, and the changes in the hysteresis loops were large only in the samples exposed to 10 to the 18th power n/sq cm. The changes in the gamma-irradiated samples were similar to but smaller than those in the neutronirradiated samples.

Descriptors :   *FERROELECTRIC CRYSTALS, *FERROELECTRIC MATERIALS, *TITANATES, AGING (PHYSIOLOGY), BARIUM COMPOUNDS, CALCIUM COMPOUNDS, CERAMIC MATERIALS, DIELECTRIC PROPERTIES, DIELECTRICS, FERROMAGNETIC MATERIALS, GAMMA RAYS, HEAT TREATMENT, HYSTERESIS, INTERMETALLIC COMPOUNDS, LEAD COMPOUNDS, NEUTRON REACTIONS, NEUTRONS, NUCLEAR PROPULSION, OXIDES, POLARIZATION, DAMAGE, RADIATION EFFECTS, SPACE ENVIRONMENTS, TEST FACILITIES, TITANIUM COMPOUNDS, ZIRCONIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE