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Electronic polarizability as a function of molecular volume for polymorphs: , calculations for Stishovite (Ref. 7), calculations (Ref. 8 ), experiment (Ref. 5 ), experiment (Ref. 6 ).
Electronic polarizability in polymorphs as a function of molecular volume. The vertical lines result from the range of published values for the refractive index.
Ionic polarizabilities in and polymorphs as a function of molecular volume. The dielectric constant used to determine for the point at results from calculation (Ref. 7 ).
Variation of the low frequency dielectric constant in various and polymorphs. The values are the experimental values allowing for variation in the molecular volume and the molecular polarizability; values were determined using the molecular polarizability determined from the experimental dielectric constant for the amorphous phase of each material and assuming it to be constant for the two other polymorphs of each system. Note that negative dielectric constant values infer that the material is ferroelectric.
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