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Journal ArticleDOI

Rapid H+ conductivity in hydrogen uranyl phosphate-A solid H+ electrolyte

01 Jul 1977-Materials Research Bulletin (Pergamon)-Vol. 12, Iss: 7, pp 701-706
TL;DR: In this article, it was shown that the layered hydrate HUO2PO4 is a rapid proton conductor with a room temperature conductivity of 4 × 10−3ohm−1cm−1.
About: This article is published in Materials Research Bulletin.The article was published on 1977-07-01. It has received 136 citations till now. The article focuses on the topics: Proton conductor & Electrolyte.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a review of the proton conductivity in materials and the elements of proton conduction mechanisms are discussed with a special emphasis on proton chemistry, including structural reorganization and diffusional motion of extended moieties.
Abstract: In this review the phenomenon of proton conductivity in materials and the elements of proton conduction mechanismsproton transfer, structural reorganization and diffusional motion of extended moietiesare discussed with special emphasis on proton chemistry. This is characterized by a strong proton localization within the valence electron density of electronegative species (e.g., oxygen, nitrogen) and self-localization effects due to solvent interactions which allows for significant proton diffusivities only when assisted by the dynamics of the proton environment in Grotthuss and vehicle type mechanisms. In systems with high proton density, proton/proton interactions lead to proton ordering below first-order phase transition rather than to coherent proton transfers along extended hydrogen-bond chains as is frequently suggested in textbooks of physical chemistry. There is no indication for significant proton tunneling in fast proton conduction phenomena for which almost barrierless proton transfer is suggest...

2,039 citations

Journal ArticleDOI
TL;DR: In this article, the ion exchange properties, densification under cold pressing, and protonic conduction are shown to have general application to other ion exchange materials, such as H3O+ ions.

193 citations

Journal ArticleDOI
W.C. Dautremont-Smith1
01 Jan 1982-Displays
TL;DR: In this paper, a two-part in-depth review is given of the electrochromic behaviour of thin films of transition metal oxides. But the authors focus on the method and details of film deposition or growth, which determine film stoichiometry and morphology and in turn strongly influence electro chromic behaviour.

176 citations

Journal ArticleDOI
29 Jun 1979-Science
TL;DR: Current research in solid ionic conductors is exploring new intercalation compounds, solid polymer electrolytes, and alkali ion and proton transport in crystalline solids.
Abstract: The discovery of inorganic solids with ionic conductivities comparable to those of aqueous electrolytes has revolutionized solid-state electrochemistry. Sodium beta alumina, a Na+ conductor, and LixTiS2, an intercalation compound with simultaneous Li+ and electronic conductivity, are two of the best and most versatile fast ionic conductors. A wide variety of cations can replace Na+ in beta alumina and Li+ in LixTiS2 and change the properties of the materials. Sodium beta alumina and LixTiS2 are currently used in the development of high-energy density batteries for electric vehicles and electrical utility load leveling. Current research in solid ionic conductors is exploring new intercalation compounds, solid polymer electrolytes, and alkali ion and proton transport in crystalline solids.

151 citations

Journal ArticleDOI
TL;DR: In this paper, a Grotthus-type mechanism of conduction is proposed which involves intermolecular transfer steps (hopping) and inter-parallel transfer steps in comparable numbers, the former facilitated by the high concentration of H 3 O + ions in the structure, and the latter most likely facilitated by high H-bond vacancies.

132 citations

References
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Journal ArticleDOI
TL;DR: In this article, a mixture of a number of small single crystals of beta alumina suspended in alpha alumina has been made, and dielectric loss measurements have been made.
Abstract: Dielectric loss measurements of a mixture consisting of a number of small single crystals of beta alumina suspended in alpha alumina have been made. The loss follows the Fuoss‐Kirkwood empirical formula e″=e″max [ln (fmax/f)α]. Some speculations are made as to the cause of the width of the loss peaks. Substitution of other (K, Ag, Rb, NH4, Li, Tl) ions for sodium causes the loss curves to shift in a direction indicating higher resistivity of the substituted beta aluminas. A quantitative relation between the shift of the loss peaks and the known resistivity of the substituted beta aluminas as would be expected from the Maxwell‐Wagner relations was unable to be made.

89 citations

Journal ArticleDOI
TL;DR: In this article, a phenomenological introduction to the important physical parameters involved in ionic conduction in solids is followed by order of magnitude estimates of these quantities for materials which can be considered to be fast ion conductors.
Abstract: A brief phenomenological introduction to the important physical parameters involved in ionic conduction in solids is followed by order of magnitude estimates of these quantities for materials which can be considered to be fast ion conductors. Experimental techniques are outlined, and a comprehensive compilation of currently available data on fast ion conductors is presented. The conductivity and diffusion data are coupled with additional criteria to indicate broad classes of materials which may show enhanced ion conductivity.

75 citations

Journal ArticleDOI
TL;DR: In this article, the lattice constants of most compounds were obtained from powder data or single-crystal data and were compared with earlier measurements as far as such as such were available, and the hydrates formed by the various compounds were studied by thermal decomposition under constant H2O partial pressure.
Abstract: The compounds MIUO2XO4· yH2O and MII(UO2XO4)2· zH2O(X = P, As; MI = H, Li, Na, K, NH4; MII = Mg, Ca, Sr, Ba; y = 0…4; z = 0…11) have been prepared and systematically studied. The hydrogen compounds HUO2PO4 · 4H2O and HUO2AsO4 · 4H2O were grown as single crystals by diffusing solutions of UO2(NO3)2, H3PO4 and H3AsO4, respectively, into large volumes of water. The alkali and alkaline-earth compounds were prepared by exchange of the H+ ions in the hydrogen compounds for alkalior alkaline-earth ions in MICl or MIICl2 solutions, respectively. The hydrates formed by the various compounds were studied by thermal decomposition under constant H2O partial pressure. The lattice constants of most compounds were obtained from powder data or—in some cases—single-crystal data and were compared with earlier measurements as far as such were available.

75 citations

Journal ArticleDOI
J. Bruinink1
TL;DR: In this paper, a survey of the relevant properties of most materials for which proton migration has been claimed is given, with special attention paid to the determination of the transport numbers of protons.
Abstract: Experimental methods which are suitable for the study of proton migration in solids are discussed. Special attention is paid to the determination of the transport numbers of protons. A survey is given of the relevant properties of most materials for which proton migration has been claimed.

49 citations