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- W2016415143 abstract "Two zirconium alkyl-sulphophenyl phosphonates with α-layered structure were prepared and characterized by TG, XRD and impedance measurements. Their formulas are: Zr(O3PC6H4SO3H)0.85(O3PC2H5)1.15·3.7H2O, with interlayer distance 18.5 Å, and Zr(O3PC6H4SO3H)0.97(O3PCH2OH)1.03·4.9H2O, with interlayer distance 19.6 Å. In both cases the crystallization water is completely lost at temperatures lower than 140°C and the decomposition of the organic moieties starts above 200°C. Reproducible conductivity values were found for anhydrous zirconium ethyl-sulphophenyl phosphonate in the range 100–180°C (σ≈10−5 S cm−1 at 180°C in dry N2 with an activation energy of 15.2 kcal/mol). A continuous conductivity decrease was instead observed in this temperature range for zirconium hydroxymethyl-sulphophenyl phosphonate. The conductivity of both compounds is greatly enhanced by the presence of water vapour. Measurements were carried out at 100 and 140°C; the highest conductivity (σ≈10−2 S cm−1) was found for Zr hydroxymethyl phosphonate at 100°C and 60% relative humidity." @default.
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- W2016415143 date "1992-12-01" @default.
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- W2016415143 title "Protonic conductivity of layered zirconium phosphonates containing -SO3H groups. II. Ac conductivity of zirconium alkyl-sulphophenyl phosphonates in the range 100–200°C, in the presence or absence of water vapour" @default.
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- W2016415143 doi "https://doi.org/10.1016/0167-2738(92)90138-f" @default.
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