Journal ArticleDOI
H+-ion conductivity and ferroelectric properties of rubidium ammonium hydrogen sulphate
TLDR
In this article, electric and dielectric measurements have been used to study the superionic conductivity and the ferroelectricity respectively in Rb0.8(NH4)0.2HSO4 single crystal.Abstract:
Electric and dielectric measurements have been used to study the superionic conductivity and the ferroelectricity respectively in Rb0.8(NH4)0.2HSO4 single crystal. This material presents a high level of conductivity at high temperature. Activation energies were determined from the temperature dependence of the alternating-current conductivity in the regions 440-560 K and beyond 560 K; they are respectively 0.15 and 0.10 eV. The dielectric measurements show an intense anomaly at 285 K indicating a ferroelectric-paraelectric phase transition. This phase transition is accompanied by a significant dispersion of the real part of the dielectric constant in the frequency region investigated, in accordance with the high level of conductivity of this material.read more
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Solid acids as electrolyte materials for proton exchange membrane (PEM) electrolysis: Review
TL;DR: In this article, the most promising solid acid materials, analyzing their structure, properties and limitations for water electrolyser applications, are presented. And the possible use of such materials in fuel cells is reviewed.
Journal ArticleDOI
Disordering phenomena in superionic conductors
TL;DR: In this paper, the key methods that have been used to deduce structural disorder in superionic conductors are described, and the important results summarized, focusing on simple archetypal systems, since these have dominated the literature.
Journal ArticleDOI
Unprecedented mechanochemical preparation of 18Crown[6] and 15Crown[5] adducts of ammonium hydrogen sulfate by grinding or kneading
TL;DR: In this paper, the complex 18Crown[6]·[NH4]2[H3O][HSO4]3·H2O has been obtained by kneading liquid 15Crown together with solid [NH4][HO4], and structural characterization has been achieved on single crystals obtained by recrystallization of the solid products from water.
Journal ArticleDOI
High-temperature phase behavior in the Rb3H(SO4)2–RbHSO4 pseudo-binary system and the new compound Rb5H3(SO4)4
TL;DR: Sakashita et al. as discussed by the authors investigated the high temperature behavior of the pseudo-binary system Rb_3H(SO_4)_2-RbHSO_4 through a combination of thermal analysis, high-temperature X-ray powder diffraction and hightemperature electrical impedance measurements.
Journal ArticleDOI
Impedance spectroscopy study on the phase transition in Cs1 − x(NH4)xHSO4
TL;DR: In this paper, conductivity measurements above room temperature have been performed in polycrystalline Cs1−−x(NH4)xHSO4 (x ǫ = 0.22, 0.54 and 0.82) by use of the impedance spectroscopy method.
References
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Potassium titanyl phosphate: properties and new applications
TL;DR: Potassium titanyl phosphate (KTP) is a unique nonlinear-optical material that is being widely used for second-harmonic generation of Nd lasers emitting near 1 μm as discussed by the authors.
Journal ArticleDOI
Electrical relaxation in a glass-forming molten salt
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Impedance and modulus spectroscopy of “real” dispersive conductors
Darryl P Almond,Anthony R. West +1 more
TL;DR: In this paper, power law dispersions in the bulk, intragranular, ac conductivity and permittivity of a non-ideal solid electrolyte are modelled by a frequency-dependent admittance in parallel with the R, C elements of a conventional equivalent circuit.
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Fast ionic conduction in Na2S+B2S3 glasses: Compositional contributions to nonexponentiality in conductivity relaxation in the extreme low-alkali-metal limit.
TL;DR: The conductivity relaxation phenomenon in glassy and crystalline ionic conductors has been known for many years to be a highly nonexponential process and the stretched exponential function exp-(t/τ) β has been used with varying levels of success to describe this relaxation.
Journal ArticleDOI
Optical Phonons and Phase Transitions in the Ammonium Halides
C. H. Perry,R. P. Lowndes +1 more
TL;DR: In this paper, the external optical phonon modes in the ammonium and deuteroammonium halides have been studied through their intrinsic phase transitions in the temperature range 4 −290°K using infrared and Raman techniques.
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