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Effects of electron irradiation on the ferroelectric properties of Langmuir-Blodgett copolymer films
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Image of FIG. 1.
FIG. 1.

Calculated relative dose and beam energy as a function of sample position. The electron beam strikes sample 1 first in each stack.

Image of FIG. 2.
FIG. 2.

Capacitance measurements showing thermal hysteresis for three of the 20-layer samples receiving different electron-beam doses, as labeled next to the curves. Notice the downward shift in the heating and cooling phase-transition peaks and the virtual elimination of thermal hysteresis accompanied by peak broadening at dose.

Image of FIG. 3.
FIG. 3.

The dielectric peak temperature (from Fig. 2) as a function of dose for heating (a) and cooling (b) for the 20-layer samples. The slope is on heating and on cooling up to where values appear to plateau.

Image of FIG. 4.
FIG. 4.

Capacitance butterfly curves for three 20-layer samples of different doses: (solid), (dashed), and (dotted).

Image of FIG. 5.
FIG. 5.

Coercive voltage determined from the butterfly capacitance peaks (Fig. 4) and the pyroelectric hysteresis loops [Fig. 6(a)] for the 20-layer samples.

Image of FIG. 6.
FIG. 6.

(a) Pyroelectric hysteresis loops of samples receiving different doses. (b) Ratio of the remanent polarization after irradiation to that before irradiation as a function of dose. Inset: Merz switching current loops for samples receiving 0-, 0.27-, and doses.

Image of FIG. 7.
FIG. 7.

Normalized x-ray diffraction intensity and pyroelectric current as a function of electron dose for the 20-layer samples.

Image of FIG. 8.
FIG. 8.

(a) X-ray diffraction data showing the (110) peaks from the 20-layer samples of different doses at room temperature (dotted line) and at (solid line). (b) (110) diffraction peak spacings vs dose at room temperature (squares) and at (circles).


Generic image for table
Table I.

Total electron dose for each irradiated sample for the three sample stacks. The electron beam strikes sample 1 first.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of electron irradiation on the ferroelectric properties of Langmuir-Blodgett copolymer films