The relaxation time distribution in dielectrics

Al-Refaie, S. N.; Elayyan, H.S.B.

doi:10.1007/bf00729902

Cited by 14 publications

(3 citation statements)

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“…Moreover, the work of Salje [25] represents also a fundamental reason for motivation of this study. According to Salje [25], the compound undergoes a ferro-and/or antiferro-electric phase change at 103 K, whereas the compound is known to undergo a ferroelectric phase transition at 368 K [3,14,15,[26][27][28]30].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric behavior and low temperature phase transition in NH₄IO₃

et al. 2012

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The electrical properties namely ac conductivity (!, T) and the complex dielectric permittivity ("*) are measured at selected frequencies (5-100 kHz) as function of temperature (95 K 5 T 5 280 K) for polycrystalline samples of NH 4 IO 3 . The ferroelectric hysteresis loops and the X-ray diffraction pattern are also measured. The analysis of the data indicates that the compound undergoes a structural phase transition at $103 K and the behavior of (!, T ) obeys the power law. The trend of the temperature dependence of the angular frequency exponent s (0 5 s 5 1) suggests that the quantum mechanical tunneling model is the most likely one that describes the conduction mechanism. The core results of the article are: (1) the low temperature ac electrical parameters are measured for NH 4 IO 3 ; (2) the data indicate that the compound undergoes a structural phase transition at 103 K; (3) the originality of this transition has been confirmed by Xray diffraction; (4) no evidence for the existence of a ferroelectric transition at 103 K as mentioned earlier; and (5) the quantum mechanical tunneling is proposed as the main mechanism of the electric conduction.

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Section: Introductionmentioning

confidence: 99%

“…(" 0 and " 00 are frequency dependent and represent the charging and loss currents, respectively) [30].…”

Section: Introductionmentioning

confidence: 99%

Dielectric behavior and low temperature phase transition in NH₄IO₃

et al. 2012

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“…Physically, ε and ε represent the charging and the loss current, respectively [17]. Moreover, both are frequency and temperature dependent.…”

Section: Introductionmentioning

confidence: 99%

Dielectric permittivity, ac conductivity and phase transition in hydroxyl ammonium sulfate

Kader¹,

Elzayat²,

Hammad³

et al. 2011

Phys. Scr.

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The complex dielectric permittivity (ε * = ε − jε ) and ac conductivity σ (ω, T) as a function of temperature (90-375 K) and frequency (0.4 kHz to ≈ 100 kHz) were measured in this work for polycrystalline samples of hydroxyl ammonium sulfate, (NH 3 OH) 2 SO 4 . The measured electrical parameters revealed the existence of a structural phase transition at T ≈ 312 K, which was further confirmed by a differential thermal analysis thermogram, where a clear endothermic peak centered at ≈ 312 K is observed. Regarding the charge transport mechanism, it is likely that the behavior of frequency-dependent conductivity follows the universal dynamic response σ (ω,T ) = A(T )ω s(T ) . Moreover, the temperature dependence of the frequency exponent s(0 s 1) suggests the quantum mechanical tunneling model to be the most likely one that describes the electrical transport mechanism. The data correlate with the crystal structure and the hydrogen-bonding system.

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