Piezoelectric and ferroelectric properties of aliphatic polyurea films synthesized by vapor deposition polymerization

Author

Hattori, Takeshi ; Takahashi, Yoshikazu ; Iijima, Masayuki ; Fukada, Eiichi

Author_Institution

Tsukuba Inst. for Super Mater., ULVAC Japan Ltd., Tsukuba, Japan

fYear

1996

fDate

25-30 Sep 1996

Firstpage

819

Lastpage

824

Abstract

Thin films of aliphatic polyurea films were synthesized on the cooled substrates by vapor deposition polymerization. Poling dynamics of the films depended on the crystallinity. Polyurea-5 exhibited ferroelectric hysteresis. The maximum values of piezoelectric stress constant e₃₁ and pyroelectric constant p₃, obtained for polyurea-5 poled at Ep=250 MV/m, Tp=150°C and tp=10 min, were 15 μC/m²K and 10 mC/m², respectively. Three relaxations were found similar to nylon in the temperature dependence of the elastic constant c₁, the dielectric constant ε₃ and the piezoelectric constant e₃₁

Keywords

dielectric hysteresis; ferroelectric thin films; piezoelectric thin films; polymer films; polymerisation; vapour deposited coatings; aliphatic polyurea film; cooled substrate; crystallinity; dielectric constant; elastic constant; ferroelectric hysteresis; ferroelectric properties; piezoelectric properties; piezoelectric stress constant; poling dynamics; polyurea-5; pyroelectric constant; relaxation; synthesis; temperature dependence; vapor deposition polymerization; Chemical vapor deposition; Crystallization; Ferroelectric films; Ferroelectric materials; Hysteresis; Piezoelectric films; Polymer films; Pyroelectricity; Sputtering; Stress;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1996. (ISE 9), 9th International Symposium on

Conference_Location

Shanghai

Print_ISBN

0-7803-2695-4

Type

conf

DOI

10.1109/ISE.1996.578213

Filename

578213