| Autor: |
Morrish, A.H., Li, Z.W., Dai, S., Zhou, X.Z., Zhao, J.G., Xiong, X.M. |
| Zdroj: |
Hyperfine Interactions; Aug1998, Vol. 113 Issue 1-4, p485-492, 8p |
| Abstrakt: |
Mössbauer spectra of (La1-xSnx)2(Mn0.985Fe0.015)2Oy ( x=0.2, 0.3, 0.4 and 0.5) from room temperature to 4.2 K have been studied; in addition X ray diffraction patterns at room temperature have been obtained. The results show that the phase compositions of (La1-xSnx)2(Mn0.985Fe0.015)2Oy are strongly dependent on the Sn concentrations and on the heat treatment. The manganites with x=0.2, 0.3 and 0.4 after annealing in air at 1200°C appear to consist of two phases, ABO3 and A2B2O7. Their Mössbauer spectra are paramagnetic doublets at room temperature that become sextets at T ∼ 230 K and ∼ 60 K. The ABO3 phase appears to be the source of the CMR in manganite (La0.7Sn0.3)2(Mn0.985Fe0.015)2Oy [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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