Poly (vinylidene fluoride), PVDF, has different crystalline phases, such as alfa, beta, gamma, delta, epsilon, depending on film processing methods. Among them, alfa, beta, and gamma are the major phases, particularly the beta phase which determines PVDF’s pyro-, piezo-, and ferroelectric properties.
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Nitrides
Found a useful table for Nitrides from wikipedia.
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US 3,953,566 teaches a method to make a water proof breathable membrane based expandable, amorphous locked Poly tetrafluoroethylene (ePTFE).
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