| Autor: |
Zheng, Yufang, Yu, Zhengfang, Zhuang, Yan, Lin, Yanzheng, Zhu, Dongyan |
| Zdroj: |
Hyperfine Interactions; February 1988, Vol. 40 Issue: 1-4 p367-370, 4p |
| Abstrakt: |
57Fe Mőssbauer effect in the perovskite series Sr(Fe1−xTix)Oy (0.0≤x≤0.99; y≤3) at RT and 78K has been analyzed. The influences of the Ti composition on the coexitence of Fe4+ and Fe3+, the ratio of Fe4+ to the total Fe, and the Y value have been studied. When 0≤x≤0.6 the ratio of Fe3+ (II) doublet to the total Fe increases as the final firing temperature increases, agreeing with the result obtained from the positron lifetime measurements. When x≥0.7, the Fe3+ (II) doublet disappears. In the range of x=0.9 and x=0.99, there still exists a considerable content of Fe4+ in samples, disagreeing with the result obtained from the chemical analysis by Clevenger. The relations between the electrical resistivity and the thermistor material constant B of negative temperature characteristic varying with Ti composition have been discussed. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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