Dielectric and AC Conductivity οf Potassium Perchlorate, KCLO4
H.M. Abdelmoneim
Physics Department, Faculty of Science, Cairo University, Giza, Egypt
Received: November 13, 2008; Corrected version: October 10, 2009; In final form: May 5, 2010
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The AC conductivity σ(ω) and the complex dielectric permittivity ε* (ω) were studied as function of temperature 300 K < T < 600 K and at some selected frequencies (1-20 kHz) for polycrystalline sample of KClO4. The differential thermal analysis (DTA) thermograph was also performed. The combined data support each other and indicate the existence of a structural phase transition at ≈ 575 K. Moreover, the temperature dependence of the ac conductivity behaves in accordance with Arrhenius relation, whereas the frequency dependent conductivity obeys the power law σ(ω) = Aωs(T). The behavior of s with temperature suggests that the hopping over the barrier model prevails. No evidence for the existence of a ferroelectric phase transition at the transition temperature.
DOI: 10.12693/APhysPolA.117.936
PACS numbers: 72.80.Ph, 77.22.Ch, 77.84.Bw