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Pyroelectric effect in ultrathin layers of achiral mesogenic composites
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Image of FIG. 1.
FIG. 1.

Chemical structures of the investigated compounds abbreviated as M6R8, M6R14n (monomers), PM6R8, and PM6R14n (polymers).

Image of FIG. 2.
FIG. 2.

Pyroelectric chip 1: Al electrodes , 2: fused quartz support (5mm in thickness), and 3: circular sensing element.

Image of FIG. 3.
FIG. 3.

Pyroelectric responses of investigated films. (a) Pyroelectric current vs frequency (current mode), 1: random copolymer of [P(VDF-TrFE), 70%:30%], , , and . 2: M-1, , , and . 3: polycrystalline guanidine nitrate , , , and . 4: M-2, , , and . Arrows show the positions of cutoff frequencies. Dot lines are the extrapolation of the pyroelectric current curve to high frequencies. (b) Pyroelectric voltage vs frequency squared (voltage mode) and load resistor . 1: random copolymer of [P(VDF-TrFE) 70%:30%], . 2: M-1, . 3: M-2, . Insert shows the low frequency mode.

Image of FIG. 4.
FIG. 4.

Pyroelectric pulses 1: random copolymer of P(VDF-TrFE, 70%:30%), , 2: liquid crystalline composite M-1, . YAG laser, pulse duration and pulse power .

Image of FIG. 5.
FIG. 5.

Pyroelectric responses vs temperature. (a) Homopolymer PM6R14n, , . (b) composite M-1, , and . Arrows show cooling and heating scans.


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Table I.

Phase transition temperatures for the investigated samples.

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Table II.

Dielectric and pyroelectric data of different materials (the units correspond to the most often used in literature).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Pyroelectric effect in ultrathin layers of achiral mesogenic composites