Medidas dielétricas em cristal de KCN a ultrabaixas freqüências / Dielectric measurements of KCN crystal at ultra-low frequencies

AUTOR(ES)

Ervino Carlos Ziemath

DATA DE PUBLICAÇÃO

1985

RESUMO

Dielectric measurements were performed at low frequencies (10-2- 40Hz) with an ultra-low frequency bridge in KCN crystals , as well as at high frequencies (50-10-4 Hz) employing a commercial capacitance bridge (General Radio). The dielectric loss curves show a good adjustment between the high and low frequencies. We obtain dielectric loss peaks in a window of five decades and in the range of 53 and 78 K. The peaks of these curves were fitted with an Arrhenius expression giving for the CN- dipoles an activation energy of 0,148eV and an attempt relaxation time of 6,53x10-15. At temperatures between 53 and 59K we observed the gradual appearing of a second loss peak for frequency of 25Hz. Its origin is not yet known butt his suggestt that the KCN, crystal may present compound dielectric properties , with - two distinct relaxation mechanisms.

ASSUNTO(S)

instrumentação constante dielétrica instrumentation cristais iônicos dielectric constant ionic crystals

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