EFFECTS OF RADIATION ON FERROELECTRIC AND FERRIMAGNETIC MATERIALS. PART I. FERROELECTRIC MATERIALS. Final Report
The effects of reactor radiation and Co/sup 60/ gamma radiation on the dielectric properties of four ceramic ferroelectric materials were studied. The materials (BaTiO/sub 3/, 96% BaTiO/sub 3/-4% (PbTiO/sub 3/, 95% BaTiO/sub 3/-5% CaTiO/sub 3/, and PZT) were given reactor fast-neutron exposures in the range 10/ sup 15/to 10/sup 18/ n/cm/sup 2/ or a gamma radiation exposure of 3.7 x 10/sup 8/ rads. Complex permittivity and large-signal hysteresis properties were measured before and after irradiation, after room temperature aging, and after 500 deg C heat treatment. The effects on the dielectric constant (the real part, epsilon , of the complex permittivity) were small after fastneutron exposures below 10/ sup 18/ n/cm/sup 2/. After 10/sup 18/ n/cm/sup 2/ average decreases in the value of epsilon of 30% at 12 days after irradiation and 55% at 255 days after irradiation were observed. After heat treatment epsilon increased but did not reach its pre-irradiation value. The quality factor, Q, decreased after all irradiation exposures; it increased following aging and heat treatment, approaching its original value. The total hysteresis loss at constant maximum electric displacement, D, increased, and the changes in the hysteresis loops were large only in samples exposed to 10/sup 18/ n/cm/sup 2/. Following irradiation loop distortions were observed, the total hysteresis loss measured by the loop area increased, and the electric displacement, D, for constant electric field, E, decreased. The changes in epsilon and Q in the gamma irradiated samples were similar to but smaller than those in the neutron irradiated samples. The hysteresis loops were less affected, and the loop changes were opposite those produced by neutrons. Hysteresis loss at constant maximum electric displacement D, decreased, and electric displacenent at constant field increased. (auth)
- Research Organization:
- Stanford Research Inst., Menlo Park, Calif.
- DOE Contract Number:
- AF19(604)-4141
- NSA Number:
- NSA-16-003518
- OSTI ID:
- 4832209
- Report Number(s):
- AFCRL-351; AD-257823
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- United States
- Language:
- English
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