Mössbauer and Magnetic Studies of Doped Lanthanum Manganite La1 – xCaxMn0.98Fe0.02O3 (x = 0.05, 0.10, 0.20): II. Stoichiometric Composition and Phase Segregation
| Autor: | V. D. Sedykh, Nataliya Chistyakova, I. Yu. Medvetskaya, V. S. Rusakov, D. I. Pchelina, Yu. A. Alekhina |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Doping Analytical chemistry 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Condensed Matter::Materials Science chemistry.chemical_compound Lanthanum manganite chemistry Ferromagnetism Phase (matter) 0103 physical sciences Mössbauer spectroscopy Antiferromagnetism Condensed Matter::Strongly Correlated Electrons 0210 nano-technology Stoichiometry |
| Zdroj: | Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques. 13:462-468 |
| ISSN: | 1819-7094 1027-4510 |
| DOI: | 10.1134/s1027451019030303 |
| Popis: | 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 Mossbauer 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. |
| Databáze: | OpenAIRE |
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