RESISTANCE AND CAPACITANCE MEASUREMENTS ON LAMELLAR GRAPHITE-AMMONIA COMPOUNDS
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The theory of spontaneous polarization in ferroelectric solids leading to an infinite value in the dielectric constant is developed from classical electrodynamics and thermodynamics. The nature of the lamellar graphite compounds is discussed and similarities in the structure of one of these, the graphite-ammonia compound, to a recognized ferroelectric, Potassium ferrocyanide trihydrate, is pointed out. The details of the equipment and the procedures necessary to form the lamellar graphite-ammonia compound using pyrolytic graphite and to test the compound to determine if it exhibits ferroelectric properties are discussed. Ferroelectricity in the graphite-ammonia compound was not observed. Differences in the results obtained using pyrolytic graphite and those obtained using polycrystalline graphite by other observers to form the graphite-ammonia compound are pointed out and discussed.
- Physical Chemistry
- Electricity and Magnetism