Proton conductivity and ferroelectric phase transition in hydrogen-bonded ferroelectric NH<sub>4</sub>IO<sub>3</sub>

Abdel‐Kader, M. M.; El-Kabbany, F.; Naguib, Hala F.; Gamal, W. M.

doi:10.1080/01411590701586936

Cited by 6 publications

(5 citation statements)

References 40 publications

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“…Note 1. The compound undergoes a ferroelectric phase transition at T 1 $ T c $ 368 K. See Abdel-Kader et al [20].…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, it behaves as a nonlinear optical material [3]. The improper ferroelectric character of the NH 4 IO 3 crystals was first suggested by Bismayer et al [15] and was recently confirmed by Abdel-Kader et al [20].…”

Section: Introductionmentioning

confidence: 88%

“…In a series of previous papers [20,24], the high temperature phase transitions as well as the conduction mechanism in the two improper ferroelectric compounds, namely KIO 3 [24] and NH 4 IO 3 [20], were extensively investigated. This article deals with similar studies in the low-temperature region 95 K 5 T 5 280 K for NH 4 IO 3 .…”

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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“…Note 1. The compound undergoes a ferroelectric phase transition at T 1 $ T c $ 368 K. See Abdel-Kader et al [20].…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 88%

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Dielectric behavior and low temperature phase transition in NH₄IO₃

et al. 2012

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“…Ammonium iodate has drawn interest because of its pyroelectric (Keve et al, 1971), ferroelectric (Oka et al, 1976), electro-optical (Salje & Bismayer, 1977) and ferroelastic properties (Abdel- Kader et al, 2008) This compound contains both halogen and hydrogen bonds, which may be implicated in these macroscopic properties. In this work, neutron powder diffraction has been used to investigate the changes in halogen and hydrogen bonding that occur as a function of temperature and relate these to some of the macroscopic properties.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the changes in hydrogen bonding accompanying the structural reorganization at 103 K in ammonium iodate

Marshall

Jones

Knight

et al. 2019

Acta Crystallogr Sect B

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Neutron powder diffraction has been used to observe the changes in hydrogen bonding that occur as a function of temperature in ND 4 IO 3 and, thus, determine the structural features that occur during the low-temperature (103 K) phase transition. It is shown that in the deuterated material the change is not a phase change per se but rather a structural reorganization in which the hydrogen bonding becomes firmly locked in at the phase transition temperature, and stays in this configuration upon further cooling to 4.2 K. In addition, both the differences and changes in the axial thermal expansion coefficients in the region 100-290 K can be explained by the changes involving both the hydrogen bonding and the secondary IÁ Á ÁO halogen bonds.

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“…Since the main object of our research programme is focused on the electrical and thermal properties as related to the phase transitions, besides to the conduction mechanism of interesting solids in general and in particular the hydrogen-bonded materials [30][31][32][33][34][35]; therefore, we decided to turn our attention to this series of compounds. Recently, some selected members of these long-chain compounds were synthesized in our laboratory.…”

Section: Introductionmentioning

confidence: 99%

Electrical and thermal investigations of energetic material (n-C₁₆H₃₃NH₃)₂CdCl₄

Abdel‐Kader

Aboud

Gamal

2015

Philosophical Magazine

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The thermal energy storage material, namely hexadecyl ammonium tetrachloro cadmate (n-C 16 H 33 NH 3 ) 2 CdCl 4 , which belongs to the organic-inorganic hybrid layered compounds, was synthesized as an example of long-chain complexes of the series (n-C n H 2n+1 NH 3 ) 2 CdCl 4 (n = 8-18). The ac conductivity σ ac (ω, T) and the complex dielectric permittivity ε*(ω, T) were extensively investigated as a function of both frequency (5-100 kHz) and temperature (100 K < T < 400 K). The general trend of the mentioned parameters indicates that the frequency dependent conductivity behaves according to the power law, namely σ ac (ω, T) α ω s(ω, T) where s is the frequency exponent (0 < s < 1). Furthermore, the differential scanning calorimetric chart and the differential thermal analysis thermogram were performed. The combination of thermal and electrical parameters confirms the existence of two main structural phase transitions of the first-order type at T ≈ 360.70 K (minor) and at T ≈ 350.70 K (major) in addition to two intermediate phases with a transition temperature at T ≈ 353.75 K. (The major transition precedes the minor one.) Different conduction mechanisms and the universality of ac conduction were discussed. The nature of each detected phase transition has been explained on the basis of the most recent crystal structure and particularly the role of the N-HÁ Á ÁCl hydrogen bonding as a trigger force for phase transitions.

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Proton conductivity and ferroelectric phase transition in hydrogen-bonded ferroelectric NH₄IO₃

Cited by 6 publications

References 40 publications

Dielectric behavior and low temperature phase transition in NH₄IO₃

Dielectric behavior and low temperature phase transition in NH₄IO₃

Investigation of the changes in hydrogen bonding accompanying the structural reorganization at 103 K in ammonium iodate

Electrical and thermal investigations of energetic material (n-C₁₆H₃₃NH₃)₂CdCl₄

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Proton conductivity and ferroelectric phase transition in hydrogen-bonded ferroelectric NH4IO3

Cited by 6 publications

References 40 publications

Dielectric behavior and low temperature phase transition in NH4IO3

Dielectric behavior and low temperature phase transition in NH4IO3

Investigation of the changes in hydrogen bonding accompanying the structural reorganization at 103 K in ammonium iodate

Electrical and thermal investigations of energetic material (n-C16H33NH3)2CdCl4

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Product

Resources

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Proton conductivity and ferroelectric phase transition in hydrogen-bonded ferroelectric NH₄IO₃

Dielectric behavior and low temperature phase transition in NH₄IO₃

Dielectric behavior and low temperature phase transition in NH₄IO₃

Electrical and thermal investigations of energetic material (n-C₁₆H₃₃NH₃)₂CdCl₄