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Space-charge relaxation and electrical conduction in KNaNbO at high temperatures.
- Source :
- Applied Physics A: Materials Science & Processing; Sep2011, Vol. 104 Issue 4, p1047-1051, 5p
- Publication Year :
- 2011
-
Abstract
- Sodium potassium niobate KNaNbO(KNN) ceramic was synthesized by a solid-state technique. The X-ray diffraction of the sample at room temperature showed a monoclinic phase. The real part ( ε′) and imaginary part ( ε″) of dielectric permittivity of the sample were measured in a frequency range from 40 Hz to 1 MHz and in a temperature range from 350 to 850 K. The ε′ deviated from Curie-Weiss law above 702 K, due to additional dielectric contributions resulting from universal dielectric response and thermally activated space charges at high temperatures. This anomaly arose from a Debye dielectric dispersion that slowed down following an Arrhenius law. We have established a link between the dielectric relaxation and the conductivity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09478396
- Volume :
- 104
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Applied Physics A: Materials Science & Processing
- Publication Type :
- Academic Journal
- Accession number :
- 64351645
- Full Text :
- https://doi.org/10.1007/s00339-011-6358-4