Search results for "Dielectric absorption"

showing 3 items of 3 documents

Effect of cobalt doping on the dielectric response of $B_{0.95}Pb_{0.05}TiO_3$ ceramics

2013

Dielectric response of Ba 0.95 Pb 0.05 TiO 3 ceramics doped with 0.1 and 1 wt.% of Co 2 O 3 , synthesized by conven- tional high-temperature method, wa s studied in wide temperature and frequency range. The temperature dependences of the real and the imaginary parts of dielectric permittivity of the ceramics were compared with those of BaTiO 3 and Ba 0.95 Pb 0.05 TiO 3. The addition of Co 3+ ions results in a broadening of dielectric anom- alies related to the transition to p araelectric cubic phase, and the structural transition between the tetragonal and the orthorhombic phases. At low temperatures (125 – 200 K) the dielectric absorp- tion of Co-doped Ba 0.95 Pb 0.05 TiO 3 ceramics was fo…

Dielectric absorptionMaterials scienceCondensed matter physics$B_{0.95}Pb_{0.05}TiO_3$Dopingdeviation from the Curie-WeisslawDielectricCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsIonco-dopingTetragonal crystal systemDipoleMechanics of Materialsdielectric propertiesvisual_artMaterials ChemistryCeramics and Compositesvisual_art.visual_art_mediumOrthorhombic crystal systemCeramicElectrical and Electronic Engineering
researchProduct

The molecular dynamics of thermoreversible networks as studied by broadband dielectric spectroscopy

1995

Polybutadienes modified by a small number of 4-phenyl-1,2,4-triazoline-3,5-dione form thermoreversible networks via hydrogen bonding between the polar stickers. The molecular dynamics of systems with different contents of polar stickers are investigated by broadband dielectric spectroscopy in the frequency regime of 10−1–109 Hz. Unmodified polybutadiene shows two relaxation processes, the α-relaxation which is correlated to the dynamic glass transition of the polybutadiene, and a β-relaxation corresponding to a local relaxation of polybutadiene segments. In the polar functionalized systems, besides these two relaxations, an additional relaxation process (called α*) is observed, which occurs…

Dielectric absorptionPolymers and PlasticsChemistryDissociation (chemistry)Dielectric spectroscopyReptationMolecular dynamicsDipoleColloid and Surface ChemistryPolybutadieneChemical physicsPolymer chemistryMaterials ChemistryPhysical and Theoretical ChemistryGlass transitionColloid & Polymer Science
researchProduct

Dielektrische Relaxation und aromatischer Bindungszustand der Amino- und Hydroxylgruppe

1965

Bei funf Wellenlangen im Bereich von 60 cm bis 7 mm wurde in benzolischer Losung bei 20 °C die dielecktrische Absorption von Benzolderivaten gemessen, die Amino- oder Hydroxylgruppen enthalten. Danach erfolgt die elektrische Dipolorientierung bei N, N'-Dimethylanilin, Diphenylamin und ver wandten Molekulen in der Art, das die drei Bindungen des Stickstoffs uber die ebene Anordnung hinweg umklappen. Ebenso kann auch das Relaxationsverhalten von Anilin beschrieben werden. Voraussetzung fur diese Inversion ist die mesomere Wechselwirkung zwischen dem Stickstoff und einem aromatischen ϕ-Elektronen-system. Dagegen ergeben die Meswerte keinen Hinweis darauf, das bei der Hydroxylgruppe auch eine s…

chemistry.chemical_compoundDielectric absorptionCrystallographyAnilinechemistryGeneral Chemical EngineeringBenzene derivativesPolymer chemistryDiphenylamineBenzeneBerichte der Bunsengesellschaft für physikalische Chemie
researchProduct