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- W2047169110 abstract "La(PO3)3–Ca(PO3)2 meta-phosphate glass–ceramic composites were prepared by quenching from the melt, followed by heating at 800 °C for 20 h, in air. Microstructural characterization showed that exposure to water vapor pressures equal to or in excess of 4.2 kPa at as low as 550 °C resulted in the disproportionation of the lanthanum metaphosphates, with formation of some LaPO4. This reaction puts important limitations on the conditions under which the lanthanum metaphosphates could be used as electrolytes in electrochemical devices. The conductivities at uniform air/water partial pressures around 3 kPa, were independent of the water partial pressures used. Comparison of the total ionic effective transference numbers and the proton effective transference number suggested that electronic transport contributed on the average about 7% to the total conductivity in the examined temperature range. The measurements suggested that oxygen ions also participate. The H/D isotope effect, assessed from the ratio σH2O/σD2O ranged from 1.28 at 400 °C to 1.35 at 500 °C, evidencing dominant proton conduction. At 550 °C, the proton effective transference numbers, tH+, determined from the OCVs of cells with oxidizing differential atmospheres were around 0.87, in good agreement with the value derived from the σH2O/σD2O conductivity ratio at 550 °C. However, at lower temperatures such agreement was not found." @default.
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- W2047169110 date "2012-06-01" @default.
- W2047169110 modified "2023-09-23" @default.
- W2047169110 title "Effective transference numbers and water incorporation in glass–ceramic La(PO3)3–Ca(PO3)2 in oxidizing atmospheres" @default.
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- W2047169110 doi "https://doi.org/10.1016/j.ssi.2012.04.020" @default.
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