Heating/cooling-induced formation, dissociation and phase separation of CuFe2O4 during thermal oxidation of Sm2(Co, Fe, Cu, Zr)17 permanent magnet
Source abstract
Abstract
This paper addresses the heating/cooling-induced formation, dissociation and phase separation during thermal oxidation of Sm 2(Co, Fe, Cu, Zr) 17 alloys at 298.15 K-973 K, using real-time and room-temperature measurements. Whereas, Fe 3O 4 forms at 673 K ≤ T ≤ 773 K, it transforms to CuFe 2O 4 at 823 K ≤ T ≤ 973 K because of the incorporation of Cu +2 into the octahedral Fe +2 lattice sites in Fe 3O 4. CuFe 2O 4 dissociates instantaneously upon cooling, and separates into layered structure of Cu-oxides at oxide-surface and Fe 3O 4 underneath. A detailed discussion on possible reaction pathways leading to these phenomena during the heating/cooling cycle is presented here.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic Properties and Synthesis of Ferrites · Magnetic Properties of Alloys · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
Show source-provided references
1. RETM5 and RE2TM17 permanent magnets development10.1063/1.341084 ↗
2. M. Marinescu, J.F. Liu and M.H. Walmer, Recent Progress in Sm-Co Type Permanent Magnets M. Marinescu, J. F. Liu and M. H. Walmer Electron Energy Corporation, Landisville, PA, USA, (2008) 1–8.
3. Metallurgical behavior of Sm(Co, Fe, Cu, Zr)z alloys10.1063/1.333575 ↗
4. Magnetic and structural properties of commercial Sm2(Co, Fe, Cu, Zr)17-based magnets10.1063/1.367565 ↗
5. A new class of permanent-magnetic materials for high temperature applications in TWTs
6. Prediction of the oxidation behaviour of Sm-Co-based magnets10.1016/j.jmmm.2004.11.408 ↗
7. Corrosion behavior of Sm-Co-based permanent magnets in oxidizing environments10.1109/TMAG.2004.829195 ↗
8. The oxidation morphology of SmCo alloys10.1016/j.jallcom.2009.07.115 ↗
9. The mechanism of high temperature oxidation of a SmCo-based magnetic alloy10.1016/j.corsci.2012.04.028 ↗
10. Decomposition behavior in the early-stage oxidation of Sm2Co17-type magnets10.1016/j.scriptamat.2021.113911 ↗
11. Atomic-scale oxidation of a Sm2Co17-type magnet10.1016/j.actamat.2021.117343 ↗
12. The oxidation morphology of SmCo alloys10.1016/j.jallcom.2009.07.115 ↗
13. Internal oxidation of Sm(CobalFe0.22Cu0.08Zr0.02)7.5 alloy at 700°C10.1016/j.corsci.2013.01.038 ↗
14. The effect of grain size on the internal oxidation of Sm2Co17-type permanent magnets10.1016/j.jmmm.2022.169219 ↗
15. Thermodynamic properties of minerals and related substances at 298.15K and 1 bar
16. Effect of dry thermal oxidation on the microstructure and magnetic properties of SmCo5 permanent magnet10.1016/j.corsci.2021.109647 ↗
17. Numerical values of the surface free energies of solid chemical elements10.1007/BF00620635 ↗
18. Activities in the spinel solid solution, phase equilibria and thermodynamic properties of ternary phases in the system Cu-Fe-O10.1007/BF02696932 ↗
19. Thermodynamic assessment of the Cu-Fe-O system10.1007/s11669-011-9951-5 ↗
20. Critical assessment and thermodynamic modeling of the Cu-Fe-O system
21. Effect of oxygen partial pressure on the phase stability of copper-iron delafossites at elevated temperatures10.3390/ma11101888 ↗
22. Preparation of a new Cu-substituted cobaltite spinel: CuCo2O410.1016/0025-5408(75)90058-6 ↗
23. Cationic distribution in copper-cobalt CuXCo3−XO4 spinels prepared by low-temperature decomposition of nitrates10.1016/0025-5408(83)90223-4 ↗
24. Phase equilibria in the cobalt oxide-copper oxide system10.1361/1054971023604161 ↗
25. Callister · 2012 · 751
26. CuO surfaces and CO2 activation: a dispersion-corrected DFT+U study10.1021/acs.jpcc.5b10431 ↗
27. The thermodynamic stability of amorphous oxide overgrowths on metals10.1016/j.actamat.2007.10.023 ↗
28. Surface oxidation and reduction of CuO-Cu2O studied using XPS and XAES10.1002/(SICI)1096-9918(199611)24:12<811::AID-SIA191>3.0.CO;2-Z ↗
29. Theoretical calculation of absolute radii of atoms and ions. Part 1. The atomic radii10.3390/i3020087 ↗
30. Interionic interactions in transition metals10.1103/PhysRevB.28.4363 ↗
31. High-throughput investigation of the formation of double spinels10.1039/D0TA09200B ↗
32. Microwave-assisted route for synthesis of nanosized metal oxides10.1016/j.stam.2007.07.001 ↗
33. Rietveld structure refinement of the cation distribution in ferrite fine particles studied by X-ray powder diffraction10.1016/j.jmmm.2004.11.053 ↗
34. The role of Fe and Cu additions on the structural, thermal and magnetic properties of amorphous Al-Ce-Fe-Cu alloys10.1016/j.jnoncrysol.2018.01.003 ↗
35. R.T. Mittireddi, A. Kumawat, R.K. Singh, E. Panda, Size-dependent thermal oxidation kinetics in Sm2(Co, Fe, Cu, Zr)17 alloy powder, (2023). [Manuscript submitted].10.1016/j.corsci.2024.111932 ↗
36. Atomic-scale oxidation of a Sm2Co17-type magnet10.1016/j.actamat.2021.117343 ↗