Ferric fluoride (FeF3) is a transparent green uniaxial weak ferromagnet (canted antiferromagnet) with a Curie temperature of 365 °K. FeF3 is far more transparent in the visible and uv than any other known material which has a spontaneous magnetic moment at room temperature. FeF3 at room temperature has 6 absorption bands between 7000 Å and the band edge which is at 2440 Å. There is a local absorption minimum of α = 4.4 cm−1 in the green at 5225 Å. The Faraday rotation is 180 °/cm at 5225 Å and increases to 1100 °/cm at 3000 Å. The birefringent phase retardation at 5200 Å is about 80 000 °/cm. The two indices of refraction are about 1.54 in the visible spectrum.
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Kurtzig et al. (1970) studied this question.
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