Electroconductivity of Potassium Orthophosphate Modified by Four-Charged Cations |
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Authors: | E I Burmakin G Sh Shekhtman |
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Institution: | (1) Ural Division, Russian Academy of Sciences, Institute of High-Temperature Electrochemistry, ul. S. Kovalevskoi 20, Yekaterinburg, 620219, Russia |
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Abstract: | Solid solutions based on K3PO4 in systems K3 – 4x
E"
x
PO4 (E" = Si, Ti, Ge, Zr, Sn, Hf, Ce) are synthesized. The crystal structure, thermal behavior, and electroconduction of the synthesized solutions is studied. The narrowest single-phase regions take place in the systems where E" = Si, Ge (x 0.025), and the widest, in the system with Zr (x 0.125, at 700°C). Introducing Ti or Sn additives (x 0.05) and minimum quantities of Zr, Hf, or Ce (x = 0.025) into potassium orthophosphate leads to stabilization of highly-conductive -modification of K3PO4 at room temperature. Maximum values of potassium-cation conduction in all the systems studied correspond to regions of single-phase solid solutions based on K3PO4. The maximum electroconductivity (0.005 S cm–1 at 300°C, 0.1 S cm–1 at 700°C) and the smallest activation energies (32–35 kJ mol–1) take place in the systems with Zr and Hf. |
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