Evolution of Structure, Magnetism, and Critical Behavior of Nanocrystalline BaCo1-yMnyO3-δ (0.0 ≤ Y ≤ 0.3)
| Autor: | Amit Kumar, Rabindra Nath Mahato, Meenakshi |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Magnetism Hexagonal phase Crystal structure Condensed Matter Physics 01 natural sciences Nanocrystalline material Electronic Optical and Magnetic Materials Crystallography Ferrimagnetism 0103 physical sciences Magnetic refrigeration Antiferromagnetism 010306 general physics Critical exponent |
| Zdroj: | Journal of Superconductivity and Novel Magnetism. 33:3883-3891 |
| ISSN: | 1557-1947 1557-1939 |
| DOI: | 10.1007/s10948-020-05653-5 |
| Popis: | We report the structural, magnetic, and magnetocaloric properties of the nanocrystalline BaCo1-yMnyO3-δ (0 ≤ y ≤ 0.3) samples synthesized by sol-gel method. The samples crystallized into different hexagonal polytypes as a function of composition and annealing temperature. The crystal structure of parent BaCoO3 (y = 0) changed from 2H- to mixed 2H+10H (y = 0.3) through 2H+12H (y = 0.2) hexagonal phase for 900 °C annealed samples. The increase in annealing temperature reduces the fraction of face sharing octahedra, and the crystal structure of 1100 °C samples exhibited 2H+12H, 12H, 12H+10H, and 2H+10H- hexagonal phases. The relationship between structural and magnetic properties is explained by the structural spin model projection. The 2H- and 10H-hexagonal phases exhibited antiferromagnetic ordering, whereas 12H- phase attributed to ferrimagnetic ordering. The critical exponent analysis indicates that the 12H- hexagonal phase exhibits mean-field approach and the other mixed hexagonal polytypes do not follow any universal model. |
| Databáze: | OpenAIRE |
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