Electric properties of solid solutions based on strontium tantalate with perovskite-type structure. Oxygen-ionic conductivity |
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Authors: | I E Animitsa N A Kochetova A Ya Neiman |
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Institution: | 1.Ural State University,Ekaterinburg,Russia |
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Abstract: | Total conductivity of Sr6 − 2x
Ta2 + 2x
O11 + 3x
(0 ≤ x ≤ 0.33) solid solutions with a cryolite structure is studied in the atmosphere with a low water vapor content under variation
of the temperature (500 < T < 1000°C) and oxygen activity in the gas phase (10−18 < aO2 < 0.21). Conductivity is divided into components. It is found that both the oxygen-ionic conductivity and the mobility of
oxygen ions increase and the percentage of p-type electronic conductivity decreases at an increase in the concentration of oxygen vacancies. It is shown that compositions
with a high strontium oxide content (0 ≤ x < 0.15) and accordingly high concentration of oxygen vacancies correspond to the maximum values of the oxygen-ionic conductivity
and low activation energies. The Sr6Ta2O11 and Sr5.92Ta2.08O11.12 compositions in a wide range of aO2 are characterized by negligibly low fractions of electronic conductivity component. For the compositions of x > 0.15, a transition occurs from the electrolytic region to mixed oxygen-hole conductivity character (at aO2 = 0.21) at an increase in the oxygen activity. |
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