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Göteborgs universitets publikationer

Impedance spectroscopy studies of K2SO4 in the intermediate temperature regime

Författare och institution:
J.E. Diosa (-); R.A. Vargas (-); Ingvar Albinsson (Institutionen för fysik (GU)); Bengt-Erik Mellander (Institutionen för teknisk fysik, Fasta tillståndets fysik, Chalmers)
Publicerad i:
Solid State Communications, 136 ( 11-12 ) s. 601-604
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
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-.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Annan teknik ->
Teknisk fysik
Postens nummer:
Posten skapad:
2006-08-25 11:15
Posten ändrad:
2010-02-26 16:04

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