Exchange Coupling in P(VDF-TrFE) Copolymer Based All-Organic Composites with Giant Electrostriction

by: Jiangyu Li

Physical Review Letters, Vol. 90, No. 21. (29 May 2003), 217601.

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Abstract

In this Letter; we discuss the dramatically enhanced electrostriction and dielectric constant in an all-organic composite consisting of polyvinylidene fluoride trifluoroethylene [P(VDF-TrFE)] copolymer matrix and copper-phthalocyanine (CuPc) particles; which could not be explained by traditional composite theory. Using a Landau-type potential energy combined with energy minimization; we demonstrate that the dramatic property enhancement is due to the exchange coupling between the dielectrically hard P(VDF-TrFE) and dielectrically soft CuPc; which becomes dominant when the heterogeneity size of the composite is comparable to the exchange length. The exchange coupling is a very effective mechanism for the enhancement of functional properties in ferroelectric and dielectric systems; and its variation with various material parameters is demonstrated and discussed.

@article{citeulike:2138047, abstract = {In this Letter; we discuss the dramatically enhanced electrostriction and dielectric constant in an all-organic composite consisting of polyvinylidene fluoride trifluoroethylene [P(VDF-TrFE)] copolymer matrix and copper-phthalocyanine (CuPc) particles; which could not be explained by traditional composite theory. Using a Landau-type potential energy combined with energy minimization; we demonstrate that the dramatic property enhancement is due to the exchange coupling between the dielectrically hard P(VDF-TrFE) and dielectrically soft CuPc; which becomes dominant when the heterogeneity size of the composite is comparable to the exchange length. The exchange coupling is a very effective mechanism for the enhancement of functional properties in ferroelectric and dielectric systems; and its variation with various material parameters is demonstrated and discussed.}, author = {Li, Jiangyu }, citeulike-article-id = {2138047}, doi = {10.1103/PhysRevLett.90.217601}, journal = {Physical Review Letters}, keywords = {electrostriction}, month = {May}, number = {21}, pages = {217601+}, posted-at = {2007-12-17 19:56:12}, priority = {2}, publisher = {American Physical Society}, title = {Exchange Coupling in P(VDF-TrFE) Copolymer Based All-Organic Composites with Giant Electrostriction}, url = {http://dx.doi.org/10.1103/PhysRevLett.90.217601}, volume = {90}, year = {2003} }

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TY - JOUR ID - citeulike:2138047 L3 - citeulike-article-id:2138047 TI - Exchange Coupling in P(VDF-TrFE) Copolymer Based All-Organic Composites with Giant Electrostriction JF - Physical Review Letters VL - 90 IS - 21 SP - 217601 PB - American Physical Society N2 - In this Letter; we discuss the dramatically enhanced electrostriction and dielectric constant in an all-organic composite consisting of polyvinylidene fluoride trifluoroethylene [P(VDF-TrFE)] copolymer matrix and copper-phthalocyanine (CuPc) particles; which could not be explained by traditional composite theory. Using a Landau-type potential energy combined with energy minimization; we demonstrate that the dramatic property enhancement is due to the exchange coupling between the dielectrically hard P(VDF-TrFE) and dielectrically soft CuPc; which becomes dominant when the heterogeneity size of the composite is comparable to the exchange length. The exchange coupling is a very effective mechanism for the enhancement of functional properties in ferroelectric and dielectric systems; and its variation with various material parameters is demonstrated and discussed. KW - electrostriction AU - Li, Jiangyu PY - 2003/05/29/ UR - http://dx.doi.org/10.1103/PhysRevLett.90.217601 ER -

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