Ferroelectric polarization reversal in polyureas with odd number of CH sub(2) groups

Ferroelectric polarization reversal in polyureas with odd number of CH sub(2) groups

Ferroelectric polarization reversal was found in polyureas with an odd number of CH sub(2) groups: polyheptamethyleneurea, polynonamethyleneurea and copoly(heptametylene/nonmethylene urea) (polyurea 79). Remanent polarization as high as 440 mC/m super(2) and coercive field of 28 MV/m were observed i...

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Veröffentlicht in:Japanese Journal of Applied Physics, Part 2: Letters Part 2: Letters, 1992-01, Vol.31 (8A), p.L1086-L1088
Hauptverfasser: Tasaka, Shigeru, Shouko, Toshikatu, Inagaki, Norihiro
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container_end_page L1088
container_issue 8A
container_start_page L1086
container_title Japanese Journal of Applied Physics, Part 2: Letters
container_volume 31
creator Tasaka, Shigeru
Shouko, Toshikatu
Inagaki, Norihiro
description Ferroelectric polarization reversal was found in polyureas with an odd number of CH sub(2) groups: polyheptamethyleneurea, polynonamethyleneurea and copoly(heptametylene/nonmethylene urea) (polyurea 79). Remanent polarization as high as 440 mC/m super(2) and coercive field of 28 MV/m were observed in quenched polyurea 79 at 90 degree C. The irreversible dielectric anomaly in a temperature region of crystal transition was shown in the quenched samples. Polyureas with an odd number of CH sub(2) groups are ferroelectrics.
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source IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link
title Ferroelectric polarization reversal in polyureas with odd number of CH sub(2) groups
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