The refractive indices of the ferroelectric vinylidene fluoride‐trifluoroethylene copolymer have been investigated. The copolymer reveals birefringence in all its composition ranges. Birefringence of the copolymer film is observed even at higher temperatures than the Curie temperature. The noticeable decrease of the refractive indices at around the Curie temperature is caused by a change of the density.

Topics
Phase transitions, Ferroelectric materials, Optical properties, Polymers, Birefringence, Thin films
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© 1982 American Institute of Physics.
1982
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