50 Result(s)
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Article
Microstructure and ion transport in Li1 + x Ti2 − x M x (PO4)3 (M = Cr, Fe, Al) NASICON-type materials
Li1 + x Ti2 − x M x (PO4)3 (M = Cr, Fe, Al) NASICON-type materials have been prepared by the Pechini process and solid-state reactions and charact...
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Article
Ion transport mechanism in hybrid MF-4SC membranes modified by silica and posphotungstic heteropoly acid
Transport properties of MF-4SC perfluorinated cation-exchange membrane composites containing hydrous silica and phosphotungstic heteropoly acid (PTA) nanoparticles were studied at various temperatures. Modific...
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Article
Lead bipyridyl hexacyanoferrate complex
A low-solubility complex [PbBipy2]6[Fe(CN)6]4 · Bipy · 14H2O was prepared and characterized by physicochemical methods. Although containing [PbBipy2]2[Fe(CN)6] discrete species and a {[PbBipy2][Fe(CN)6]} ...
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Article
Water self-diffusion and ionic conductivity in perfluorinated sulfocationic membranes MF-4SK
Water self-diffusion and ion mobilities in various ionic forms (H+, Li+, Na+, Rb+, Cs+, and Ba2+) of perfluorinated sulfocationic membranes MF-4SK were studied by NMR and impedance spectroscopy. When degrees of h...
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Article
Diffusion mobility of alkali metals in perfluorinated sulfocationic and carboxylic membranes as probed by 1H, 7Li, 23Na, and 133Cs NMR spectroscopy
The hydration, state, and ion mobility of protons and alkali metal cations (Li+, Na+, and Cs+) in perfluorinated sulfocationic membranes (MF-4SK) and carboxylic membranes (F-4KF) were studied using NMR and impeda...
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Article
Synthesis and characterization of MF-4SK + SiO2 hybrid membranes modified with tungstophosphoric heteropolyacid
Composites based on MF-4K perfluorinated cation-exchange membranes doped with hydrous silica nanoparticles, which were precipitated under various conditions, and with tungstophosphoric heteropolyacid nanoparti...
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Article
Phase transitions of the NASICON-type mixed phosphates LiM2(PO4)3 (M = Ti, Zr) and LiInNb(PO4)3
The structural phase transitions of LiTi2(PO4)3, LiInNb(PO4)3, and LiZr2(PO4)3 have been studied by X-ray diffraction, impedance spectroscopy, 7Li NMR spectroscopy, and calorimetry. The results indicate that, as ...
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Article
Phase transitions and ion transport in NASICON materials of composition Li1 + x Zr2 − x In x (PO4)3(x = 0–1)
NASICON materials of composition Li1 + x Zr2 − x In x (PO4)3(x = 0–1) were synthesized. The phase constitution, particle size, and...
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Article
Cation mobility in modified Li1 − x Ti2 − x Nb x (PO4)3 lithium titanium NASICON phosphates
Li1 − x Ti2 − x Nb x (PO4)3 NASICON materials are prepared and studied by X-ray diffraction, 7Li and 31P NMR spectroscopy, and imp...
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Article
Kinetics of solid-phase H+/M+ ion exchange on hafnium hydrogen phosphate
The kinetics of solid-phase reactions between hafnium hydrogen phosphate and alkali metal chlorides were studied by thermogravimetry with subsequent analysis of leaving gases. For sodium and potassium chloride...
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Article
Synthesis and ionic conductivity of silver magnesium zirconium molybdates
The silver magnesium zirconium molybdate Ag4Mg2Zr(MoO4), undoped and aliovalently doped with yttrium and aluminum, has been characterized by impedance spectroscopy, X-ray diffraction, and IR spectroscopy. The mat...
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Article
Phase transformations and cation mobility in Li3 − 2x Nb x In2 − x (PO4)3 complex phosphates
Cation mobility in Li3 − 2x Nb x In2 − x (PO4)3 complex phosphates was studied by impedance spectroscopy, calorimetry, and 7Li NMR...
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Article
Ion transport in MF-4SK membranes modified with hydrous zirconium hydrogen phosphate
Composites based on perfluorinated cation-exchange membranes MF-4SK with embedded zirconium hydrogen phosphate were synthesized using various precursors. Physicochemical interfacial interactions were discovere...
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Article
Cationic mobility in Li3−2x Nb x Fe2−x (PO4)3 complex phosphates
Synthesis and ionic conductivity of Li3−2x Nb x Fe2−x (PO4)3 complex phosphates were studied by X-ray powder diffraction and imped...
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Article
Cation mobility in systems based on high-molecular-weight sulfonic acids and polyaniline
Conduction properties and intermolecular interactions in systems based on high-molecular-weight sulfonic acids (poly(4-styrenesulfonic), poly(2-acrylamidomethylpropane-sulfonic), and perfluorosulfonic (MF-4SC)...
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Article
Ion transport in MF-4SK membranes modified with hydrous zirconia
Composites based on perfluorinated cation-exchange membranes MF-4SK with embedded hydrous zirconia were synthesized. The composites have higher proton conductivity, lower diffusion permeability, and higher ion...
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Article
Transport properties of hydrous-silica-modified MF-4SK membranes
Composites are manufactured on the basis of MF-4SK perfluorinated cation-exchange membranes modified with hydrous silica nanoparticles 2–5 nm in size. Modification improves the ionic conductivity and diffusion...
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Article
Transport properties of MF-4SK membranes modified with inorganic dopants
Proton transport in MF-4SK perfluorinated sulfo cationic membranes modified by silica and zirconium hydrogen phosphate were studied using pulsed-field gradient NMR and impedance spectroscopy. At high water con...
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Article
Heat-treatment induced evolution of the morphology and microstructure of zirconia prepared from chloride solutions during
The properties of hydrous zirconia prepared from ZrOCl2 solutions were studied as functions of precipitation pH and subsequent heat treatment. Precipitation at pH ≤ 6 yields hydrous zirconia containing excess sor...
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Article
Kinetics of H+/Na+ solid-phase ion exchange on iron(III) hydrogen sulfate
The kinetics of solid-phase reaction between iron(III) hydrogen sulfate and sodium chloride was studied by thermal analysis followed by analysis of leaving gases. The exchange kinetics are described by the sof...
