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Autor(en): Dressel, Martin
Helberg, Hans Wilhelm
Titel: Microwave dielectric properties of disubstituted diacetylene DNP single crystals
Erscheinungsdatum: 1991
Dokumentart: Zeitschriftenartikel
Erschienen in: Synthetic Metals 41 (1991), S. 245-248
URI: http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-45859
http://elib.uni-stuttgart.de/handle/11682/7025
http://dx.doi.org/10.18419/opus-7008
Zusammenfassung: The dielectric properties of dlsubstltuted diacetylene DNP single crystals were measured by microwaves In order to study the ferroelectric phase transition as a function of solid state polymerization. The high frequency properties of the permittivity were studied In DNP monomer and also in DNP crystals that were partially polymerized at a temperature of 130°C for different periods of time. At Tc = 46.5 K the dielectric constant of the monomer shows a sharp peak. No change of this behaviour was found by cooling down for several times. The peak of ε' Is getting flat and shifted to lower temperatures with advanced duration of thermal polymerization. The monomer crystals show a small peak of dielectric losses ε"≈ 1at Tc. At the beginning of polymerization the peak height Is getting larger and dielectric losses were measured down to 4 K. For polymerizing more than 3 h the maximum is reduced and flat; no losses at all are found after full polymerization.
Enthalten in den Sammlungen:15 Fakultätsübergreifend / Sonstige Einrichtung

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