| Autor: |
Pchelina, D. I., Medvetskaya, I. Yu., Chistyakova, N. I., Rusakov, V. S., Sedykh, V. D., Alekhina, Yu. A. |
| Zdroj: |
Journal of Surface Investigation: X-Ray, Synchrotron & Neutron Techniques; May2019, Vol. 13 Issue 3, p462-468, 7p |
| Abstrakt: |
Phase segregation in calcium-doped lanthanum manganite of stoichiometric composition La1 – xCaxMn0.98Fe0.02O3 (x = 0.05, 0.10, 0.20) is studied in a wide temperature range by Mössbauer spectroscopy, X-ray diffraction analysis, and magnetic methods. Structural phase segregation is the coexistence of three rhombic phases, I, II, and II*, described by the same space group Pnma and characterized by different types of magnetic ordering at low temperatures. Phase I transitions to the ferromagnetic state as the temperature decreases, and phases II and II* become antiferromagnetic. At 80 K, stoichiometric samples demonstrate a relaxation behavior which can be due to the presence of small-sized magnetic clusters. The relative content of the ferromagnetic phase increases with increasing Ca content, and the temperature of its magnetic transition grows. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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