Separate poling of inclusions and matrix in PT/P(VDF-TrFE) 0-3 composites

Author

Ploss, B. ; Ploss, B. ; Shin, F.G. ; Chan, H.L.W. ; Choy, C.L.

Author_Institution

Dept. of Appl. Phys., Hong Kong Polytech. Univ., Hung Hom, Hong Kong

fYear

1998

fDate

1998

Firstpage

299

Lastpage

302

Abstract

A procedure for separate poling of the ceramic particles and the copolymer matrix of 0-3 composites has been developed. 2.5 μm thick films of 56/44 mol-% vinylidene fluoride-trifluoroethylene (P(VDF-TrFE)) copolymer embedded with 8 volume% lead titanate (PT) ceramic particles were investigated. First, the ceramic particles in the composite are polarized under a DC-field at temperatures above the Curie temperature of the copolymer. In the second step the P(VDF-TrFE) matrix is poled at room temperature in an AC-field at a frequency of 1 Hz. The degree of poling of the composite is then investigated by the measurement of the second order permittivity and the pyroelectric coefficient over a temperature range covering the ferroelectric and paraelectric phase of the copolymer matrix. The results show that the polarization of the ceramic is unchanged by the subsequent AC poling of the copolymer matrix

Keywords

composite materials; dielectric polarisation; ferroelectric Curie temperature; ferroelectric ceramics; filled polymers; lead compounds; permittivity; polymer blends; 1 Hz; 2.5 mum; AC poling; Curie temperature; PT/P(VDF-TrFE) 0-3 composites; PbTiO₃; ceramic particles; copolymer matrix; degree of poling; inclusions; paraelectric phase; pyroelectric coefficient; second order permittivity; separate poling; Ceramics; Ferroelectric materials; Frequency measurement; Permittivity measurement; Phase measurement; Polarization; Pyroelectricity; Temperature distribution; Thick films; Titanium compounds;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Ferroelectrics, 1998. ISAF 98. Proceedings of the Eleventh IEEE International Symposium on

Conference_Location

Montreux

ISSN

1099-4734

Print_ISBN

0-7803-4959-8

Type

conf

DOI

10.1109/ISAF.1998.786693

Filename

786693