Complex Cation and Spin Orders in the High-Pressure Ferrite CoFe3O5
| Autor: | Ka H. Hong, J. Paul Attfield, Elena Solana-Madruga, Mauro Coduri |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Magnetoresistance
Chemistry Scattering Neutron diffraction 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology Trigonal prismatic molecular geometry 01 natural sciences 0104 chemical sciences Inorganic Chemistry Crystallography Ferromagnetism Ferrimagnetism Ferrite (magnet) Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Hong, K H, Solana-madruga, E, Coduri, M & Attfield, J P 2018, ' Complex Cation and Spin Orders in the High-Pressure Ferrite CoFe3O5 ', Inorganic Chemistry . https://doi.org/10.1021/acs.inorgchem.8b02458 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/acs.inorgchem.8b02458 |
| Popis: | A ferrite in the Sr2Tl2O5-type MFe3O5 family with M = Co has been synthesized at 12 GPa pressure. Neutron diffraction shows the sample to be Co deficient with composition Co0.6Fe3.4O5. The Co/Fe cation distribution is found to be profoundly different from those of MFe3O5 analogs and lies between normal and inverse limits, as Co2+ substitutes across trigonal prismatic and one of the two octahedral sites. CoFe3O5 shows complex magnetic behavior with weak ferromagnetism below TC1 ≈ 300 K and a second transition to ferrimagnetic order at TC2 ≈100 K. Spin scattering of carriers leads a substantial increase in the hopping activation energy below TC1, and a small negative magnetoresistance is observed at low temperatures. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|