• Keine Ergebnisse gefunden

The Permittivity and AC Conductivity of the Layered Perovskite [(CH3

N/A
N/A
Protected

Academic year: 2022

Aktie "The Permittivity and AC Conductivity of the Layered Perovskite [(CH3"

Copied!
1
0
0

Wird geladen.... (Jetzt Volltext ansehen)

Volltext

(1)

The Permittivity and AC Conductivity of the Layered Perovskite [(CH

3

)(C

6

H

5

)

3

P]

2

HgI

4

Ahmed A. A. Youssef

Department of Physics, Faculty of Science, University of Cairo, Giza, Egypt Reprint requests to Dr. A. A. A. Y.

Z. Naturforsch. 57a, 263 – 269 (2002); received January 28, 2002

The dielectric permittivity and ac conductivity of bis-(Methyltriphenyl-phosphonium)2tetraiodo- mercurate (II), [(CH3)(C6H5)3P]2HgI4, has been measured in at 300–400 K and 0.11–20 kHz. The fre- quency dependent conductivity is interpreted in terms of the jump relaxation model, where translational and reorientational hopping takes place. The conductivity results were fitted to the law

s=s0+ A1(T)ws+ A2(T) wr, with s < 1 and r < 2 .

The temperature dependence of the conductivity was fitted to two relaxation processes. The activation energies DE1and DE2are frequency dependent and lie in the ranges of 0.8 eV and 0.2 eV. DE1is asso- ciated with translational long range hopping while, DE2is associated with localized and/or reorientation- al hopping. PACS Nos. 76, 77.

Key words: AC Permittivity; AC Conductivity; Phase Transition;Dielectric measurement.

Referenzen

ÄHNLICHE DOKUMENTE

The H 2 O‐enhanced ionic conductivity may contribute significantly to the electrical conductivity pro fi le in the asthenosphere, especially in the regions under relatively high

This binary mixture represents a typical example of simple eutectic system, with eu- tectic composition x (AgCl) = 0.796 and temperature T eut = 668 K, respectively. The electrical

The onset of the character- istic dispersion (region II), at the high frequency end of region I shifts towards higher frequencies with increas- ing temperature.. The slopes of the lns

In summary, our studies reveal that the room temperature electronic transport properties in pulled metallic (Au) nanowires evolve as a function of length, from conductance

In the history of political and economic culture of the world, facts have suggested that, while considering the relevant issues, intellectual effect can very well prevent the

Abstract--After some brief comments on the measurement of temperature and electrical conductivity in oceanography, the measuring probes suitable for in situ measurements

These high-resolution images were segmented using a threshold of 220 mgHA/cm 3 to evaluate the following morphometric parameters: bone volume fraction (BV/TV), bone surface

Individual molecules can be assembled between two electrodes in break junctions based on scanning tunneling microscopy (STM) 18-22 or mechanically controlled break junctions