| Abstrakt: |
It is possible to increase the electrical resistance of materials with vacancy transfer of oxygen anions by filling some of the oxygen vacancies with oxygen admitted by means of additives forming a solid solution. To bring in additional oxygen the cation of the additive should have a higher degree of oxidation than the cation it is replacing in the strontium zirconate. In terms of the effective influence on enhancing the conductivity of strontium zirconate, the additives are arranged in accordance with the amount of admitted oxygen in the series: YO + NbO, SrO + WO, YO+2 WO, 2SrO+ NbO, YO+2ZrO, YO. Additions of yttrium, tungsten, and niobium oxides will improve the working properties of ceramics based on strontium zirconate, since they increase its electrical resistance by 10 or more times at room temperature, and 4-7 times at 1500°C, which indicates the preservation, up to quite high temperatures, of the marked influence on conductivity of the transfer of oxygen through the oxygen vacancies. [ABSTRACT FROM AUTHOR] |
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