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Dielectric relaxation in NH4HSO4 above room temperature

J.E. Diosa ; R. A. Vargas ; Ingvar Albinsson ; Bengt-Erik Mellander (Institutionen för teknisk fysik, Fasta tillståndets fysik)
SOLID STATE IONICS (0167-2738). Vol. 177 (2006), 13-14, p. 1107-1110.
[Artikel, refereegranskad vetenskaplig]

The dispersion curves of the dielectric response of NH4HSO4 show that the corrected imaginary part of permittivity, epsilon", and its real part epsilon' versus frequency reveal a dielectric relaxation around 9.1 x 10(5) Hz at 31 degrees C, which shifts to higher frequencies (similar to 10(6) Hz) as the temperatures increases. The relaxation frequency shows an activated relaxation process over the temperature range 31-83 degrees C with activation energy E-a = 0.14 eV, which is close to that derived from the dc conductivity. We suggest that the observed dielectric relaxation could be produced by the H+ jump and SO4- reorientation that cause distortion and change the local lattice polarizability inducing dipoles like HSO4-.



Denna post skapades 2009-01-10. Senast ändrad 2010-02-26.
CPL Pubid: 84881

 

Institutioner (Chalmers)

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

Ämnesområden

Den kondenserade materiens fysik

Chalmers infrastruktur