Über die Radikale in Natrium‐ und Kaliumperoxoborat

The phase diagram of the catalytically important K2S2O7−KHSO4 solvent system has been investigated by means of electrochemical, thermal, and spectroscopic methods. The phase diagram exhibits a eutectic at ΧKHSO 4 = 0.94(1) with a temperature of fusion of 205 °C. No compound is formed in the system, but the strong α → β solid−solid transition of K2S2O7, found at 318 °C with ΔH tr = 21.8 kJ/mol, gives rise to a marked change in the slope of the liquidus curve at this temperature. The experimental phase diagram is in very good accordance with a calculated diagram based on the assumption of an ideal liquid mixture. 39K, 1H, 17O, and 33S NMR measurements on the molten K2S2O7−KHSO4 mixtures up to 540 °C show that a fast ionic exchange takes place in the melt at all compositions. The conductivities of the solid and molten K2S2O7−KHSO4 systems were measured at 13 different compositions in the whole composition range, ΧKHSO 4 = 0−1. For each composition in the temperature range examined , the conductivity of the molten mixtures has been expressed by equations of the form κ = A(Χ) + B(Χ)(T − 600) + C(Χ)(T − 600)2. The measurements indicate an enhanced molar conductivity of the binary system, probably due to delocalization of the conducting ions compared to the pure molten components.

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Conductivity, NMR, Thermal Measurements, and Phase Diagram of the K₂S₂O₇−KHSO₄System

Eriksen

Fehrmann

Hatem

et al. 1996

J. Phys. Chem.

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Über die Radikale in Natrium‐ und Kaliumperoxoborat

Cited by 1 publication

References 2 publications

Conductivity, NMR, Thermal Measurements, and Phase Diagram of the K₂S₂O₇−KHSO₄System

Conductivity, NMR, Thermal Measurements, and Phase Diagram of the K₂S₂O₇−KHSO₄System

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Über die Radikale in Natrium‐ und Kaliumperoxoborat

Cited by 1 publication

References 2 publications

Conductivity, NMR, Thermal Measurements, and Phase Diagram of the K2S2O7−KHSO4System

Conductivity, NMR, Thermal Measurements, and Phase Diagram of the K2S2O7−KHSO4System

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Product

Resources

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Conductivity, NMR, Thermal Measurements, and Phase Diagram of the K₂S₂O₇−KHSO₄System

Conductivity, NMR, Thermal Measurements, and Phase Diagram of the K₂S₂O₇−KHSO₄System