Electroconduction of Potassium Orthophosphate Modified with Triple-Charged Cations |
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Authors: | Burmakin E I Shekhtman G Sh |
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Institution: | (1) Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 20, Yekaterinburg, 620219, Russia |
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Abstract: | Solid electrolytes in the systems K3 – 3x
Me
x
PO4 (Me = Sc, Y, In, La, Nd, Gd, Tb) are synthesized. Their phase composition and the temperature and concentration dependences of their electroconductivity are studied. In all the systems there form solid solutions based on K3PO4, which have a high potassium cation conductance. The latter is due to the formation of potassium vacancies at substitutions 3K+ Me3+ and, at lower temperatures, to stabilization of a high-temperature -modification of potassium orthophosphate. The electroconductivity of synthesized solid solutions, which equals (4–7) × 10–3 and 10–1 S cm–1 at 300 and 700°C, is similar to that of solid electrolytes K3 – x
P1 – x
E
x
VIO4 and K3 – 4x
E
x
IVPO4. |
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Keywords: | solid potassium-conducting electrolytes ionic conduction potassium orthophosphate |
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