Abstract
By potentiometric measurements using the electrochemical cell: Au, O 2, CO 2 | K 2 CO 3 ( Au ) | KBA ( Au ) | YSZ | KBA ( Au ) | Borate glass , NiO, FeO∣FeNi∣Au the potassium activity of the heterogeneous phase system K-beta-Al 2O 3(KBA)/borate glass, MeO/Me has been determined between T = (350 and 670) °C. It is given by lg a K = 4.590 ± 0.42 - ( 17044.44 ± 318.6 K ) / T . The establishment of the potassium chemical potential within the phase system results from the interaction between the borate glass and K-beta-Al 2O 3 yielding a defined content of potassium oxide that in its turn equilibrates with the oxygen potential coming from the interaction between Me and MeO.
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