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Impedance spectroscopy studies of K2SO4 in the intermediate temperature regime

J.E. Diosa ; R.A. Vargas ; Ingvar Albinsson ; Bengt-Erik Mellander (Institutionen för teknisk fysik, Fasta tillståndets fysik)
Solid State Communications (0038-1098). Vol. 136 (2005), 11-12, p. 601-604 .
[Artikel, refereegranskad vetenskaplig]

Impedance spectroscopy measurements of K2SO4 have been carried out from 5 Hz to 13 MHz over the temperature range 403-782 T. The plots of corrected imaginary part of permittivity, epsilon", and its real part epsilon' vs. frequency clearly show a new dielectric relaxation around epsilon") = 1.4 X 10(4) Hz at 403 degrees C, which shifts to higher frequencies (similar to 1 MHz) as the temperatures increases. The fma (calculated from the peak position of epsilon") vs. reciprocal T shows an activated relaxation process over the temperature range 403-600 T with activation energy E-a = 1.02 eV, which is close to that derived from the dc-conductivity, E-a = 1.15 eV. We suggest that the observed dielectric relaxation could be produced by the K+ jump and SO4- reorientation that cause distortion and change the local lattice polarizability inducing dipoles like KSO4-.

Denna post skapades 2006-08-25. Senast ändrad 2010-02-26.
CPL Pubid: 10091


Institutioner (Chalmers)

Institutionen för fysik (GU) (GU)
Institutionen för teknisk fysik, Fasta tillståndets fysik (2005-2015)


Teknisk fysik

Chalmers infrastruktur