Co-cation conduction of the (Na1-x
K
x
)3.8M0.1P2O7 (M = Ca, Sr, Cd) solid solutions |
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| Authors: | N B Smirnov E I Burmakin B D Antonov G Sh Shekhtman |
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| Institution: | (1) Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 20, 620219 Yekaterinburg, Russia |
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| Abstract: | Samples of systems (Na
1-x
K
x
)3.8M0.1P2O7 (M = Ca, Sr, Cd; 0 ≤x ≤ 1) are synthesized. It is established that solid solutions with the structure of γ-K4P2O7 form in these systems. At room temperature, the solutions exist atx ≥ 0.7. In the calcium-containing system, they form a continuous series at temperatures exceeding ∼500°C. The co-cation character
of conduction of the solutions is confirmed by measured transport numbers. The concentration dependences of the electroconductivity
and its activation energy point to a polyalkali effect, which decreases with an increase in the M2+ ion radius. Partial conductivities of sodium and potassium cations in the (Na
1-x
K
x
)3.8Ca0.1P2O7 system are calculated and their dependences on the balance between alkali cations in the solid solution are discussed |
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| Keywords: | |
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