Influence of annealing treatment on magnetic properties of Fe2O3/SiO2 and formation of ε-Fe2O3 phase
Source abstract
Abstract
Abstract Magnetic properties of Fe 2 O 3 /SiO 2 samples were studied after being produced by sol-gel synthesis and formation of e-Fe 2 O 3 polymorph. Samples were thermally treated, using different annealing temperatures and annealing times. The size and morphological characteristics of the iron oxide nanoparticles were examined using a TEM microscope. We used the “ellipticity of shapes”, which is a measure of how much the shape of a nanoparticle differs from a perfect ellipse, in order to quantitatively describe morphological properties of nanoparticles. Coercivity measurements were used to identify and monitor the formation of the epsilon-iron oxide phase during the thermal treatments (annealing). Coercivity values were in the range from 1.2 to 15.4 kOe, which is in accordance with previous experience regarding the existence of e-Fe 2 O 3 . We have determined the optimal formation conditions for the e-Fe 2 O 3 polymorph (t=1050 °C for 7 h, H C =15.4 kOe), as well as the narrow temperature interval (1050–1060 °C) in which the polymorph abruptly vanished (H C =2300 Oe), on the basis of results of the magnetic properties. The threshold temperature for the e-Fe 2 O 3 phase transformation was measured as 1060 °C. We found that different annealing temperatures and annealing times significantly affected magnetic properties of the examined samples.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Iron oxide chemistry and applications · Minerals Flotation and Separation Techniques · Magnetic Properties and Synthesis of Ferrites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (86)
Show source-provided references
1. Microwave combustion synthesis, structural, optical and magnetic properties of Zn1−xSrxFe2O4 nanoparticles10.1016/j.ceramint.2013.01.012 ↗
2. Electromagnetic properties and humidity-sensing studies of magnetically recoverable LaMgxFe1−xO3−δ perovskites nano-photocatalysts by sol-gel route10.1007/s10948-016-3465-7 ↗
3. Fundamental study of LaMgxCr1−xO3−δ perovskites nano-photocatalysts: sol-gel synthesis, characterization and humidity sensing10.1007/s11814-015-0282-9 ↗
4. Role of Mn2+ doping on structural, morphological, and opto-magnetic properties of spinel MnxCo1−xFe2O4 (x=0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) nanocatalysts10.1007/s10948-015-2987-8 ↗
5. A novel synthesis of Zn2+-doped CoFe2O4 spinel nanoparticles: structural, morphological, opto-magnetic and catalytic properties10.1007/s10948-015-3054-1 ↗
6. Comparative studies of microwave-and sol-gel-assisted combustion methods of Fe3O4 nanostructures: structural, morphological, optical, magnetic and catalytic properties10.1007/s10948-014-2835-2 ↗
7. Room temperature ferromagnetism of magnetically recyclable photocatalyst of Cu1−xMnxFe2O4-TiO2 (0.0≤x≤0.5) nanocomposites10.1007/s10948-014-2945-x ↗
8. A novel one-pot combustion synthesis and opto-magnetic properties of magnetically separable spinel MnxMg1−xFe2O4 (0.0≤x≤0.5) nanophotocatalysts10.1007/s10948-014-2864-x ↗
9. Spinel NixZn1−xFe2O4 (0.0≤x≤1.0) nano-photocatalysts: synthesis, characterization and photocatalytic degradation of methylene blue dye10.1016/j.molstruc.2016.04.049 ↗
10. Optical and magnetic properties of Mg-doped ZnFe2O4 nanoparticles prepared by rapid microwave combustion method10.1016/j.spmi.2013.09.021 ↗
11. A simple Aloe vera plant-extracted microwave and conventional combustion synthesis: morphological, optical, magnetic and catalytic properties of CoFe2O4 nanostructures10.1016/j.molstruc.2014.07.054 ↗
12. Structural, morphological, and opto-magnetic characterizations of magnetically separable spinel CoxMn1−xFe2O4 (0≤x≤1) nano-catalysts10.1007/s10948-014-2771-1 ↗
13. Hibiscus rosa-sinensis leaf extracted Green methods, magnaeto-optical and catalyitic properties of spinel CuFe2O4 nano-and microstructures10.1007/s10904-015-0203-8 ↗
14. Enhanced catalytic activity and magnetic properties of spinel Mn(x)Zn(1−x)Fe2O4 (0.0 a parts per thousand currency sign xa parts per thousand currency sign 1.0) nano-photocatalysis by microwave irradiation route10.1007/s10948-016-3527-x ↗
15. One-pot flash combustion synthesis, structural, morphological and opto-magnetic properties of spinel MnxCo1−xAl2O4 (x=0, 0.3, and 0.5) nanocatalysts10.1007/s10948-014-2841-4 ↗
16. Mn2+ doped NiS (MnxNi12xS: x=0.0, 0.3 and 0.5) nanocrystals: structural, morphological, opto-magnetic and photocatalytic properties10.1007/s10904-014-0163-4 ↗
17. Magneto-optical and photocatalytic properties of magnetically recyclable MnxZn1−xS (x=0.0, 0.3, and 0.5) nanocatalysts10.1007/s10948-015-3089-3 ↗
18. Synthesis, optical and magnetic properties of pure and Co-doped ZnFe2O4 nanoparticles by microwave coombustion method10.1016/j.jmmm.2013.09.013 ↗
19. Structural, optical and magnetic properties of porous α-Fe2O3 nanostructures prepared by rapid combustion method10.1166/jnn.2013.7402 ↗
20. Structural, optical and magnetic properties of Fe3O4 nanoparticles prepared by a facile microwave combustion method10.1016/j.jiec.2013.09.035 ↗
21. One-pot low temperature synthesis and characterization studies of nanocrystalline α-Fe2O3 based dye sensitized solar cells10.1166/jnn.2015.9804 ↗
22. nanometer-size hard magnetic ferrite exhibiting high optical-transparency and nonlinear optical-magnetoelectric effect10.1038/srep14414 ↗
23. Solar H2 generation via ethanol photoreforming on ε-Fe2O3 nanorod arrays activated by Ag and Au nanoparticles10.1039/C4RA04485A ↗
24. Au/ε-Fe2O3 nanocomposites as selective NO2 gas sensors10.1021/jp5032288 ↗
25. High-frequency milimeter wave asorption of indium-substituted ε-Fe2O3 spherical nanoparticles10.1063/1.4870168 ↗
26. Hadjipanayis · 1997
27. Viswanathan · 1990
28. Synthesis of high-coercivity cobalt ferrite particles using water-in-oil microemulsions10.1016/S0304-8853(96)00280-6 ↗
29. Dynamic magnetization of ε-Fe2O3 in pulse field: evidence of surface effect10.1063/1.4907586 ↗
30. Epsilon-phase iron(III) oxide nanowires for a magnetic-resonance spin-current source10.1134/S1027451015030040 ↗
31. Facile synthesis of nanosized ε-Fe2O3 particles on the silica support10.1007/s11051-011-0542-5 ↗
32. Multiferroic iron oxide thin films at room temperature10.1002/adma.201400990 ↗
33. The magnetic transition in ε-Fe2O3 nanoparticles: magnetic properties and hyperfine interactions from Mossbauer spectroscopy10.1063/1.4907610 ↗
34. Electronic and magnetic properties of GaFeO3: ab initio calculations for varying Fe/Ga ratio, inner cationic size disorder, and epitaxial strain10.1103/PhysRevB.92.104408 ↗
35. Size effects in the magnetic properties of ε-Fe2O3 nanoparticles10.1063/1.4936838 ↗
36. Spin state and sattelite structures of ε-Fe2O3 as determined by resonant photoelectron spectroscopy10.1016/j.nimb.2015.08.062 ↗
37. Surface efffects and magnetic ordering in few-nanometer-size ε-Fe2O3 particles10.1063/1.4827839 ↗
38. Structure evolution of nanoaprticulate Fe2O310.1039/C4NR06989G ↗
39. Multi-functional iomimetric graphene induced transformation of Fe3O4 to ε-Fe2O3 at room temperature10.1039/C5RA17247K ↗
40. A temperature and magnetic field dependence Mössbauer study of ε-Fe2O310.1007/s10751-006-9311-8 ↗
41. Epitaxial stabilization of ε-Fe2O3 (00I) thin films on SrTiO3 (111)10.1063/1.3360217 ↗
42. Design and performance of GMR sensors for the detection of magnetic microbeads in biosensors10.1016/S0924-4247(03)00380-7 ↗
43. 〈http://www.faculty.rsu.edu/users/c/clayton/www/carman/paper.html〉.
44. Spintronics—a retrospective and perspective10.1147/rd.501.0101 ↗
45. U.S. Missile Defense Agency, (Washington, DC: Department of Defense), 2004 Technology Applications Report, 2005, pp. 44–45.
46. Magnetoelectric coupling in ε-Fe2O3 nanoparticles10.1088/0957-4484/17/3/012 ↗
47. Cornell · 1996
48. Giant coercive field of nanometer-sized iron oxide10.1002/adma.200305297 ↗
49. Botanical iron minerals: correlation between nanocrystal structure and modes of biological self-assembly10.1127/0935-1221/2001/0013-1235 ↗
50. Large Coercive Filed in magnetic-field oriented ε-Fe2O3 nanorods10.1016/j.cplett.2008.04.121 ↗
51. The addition effects of alkaline earth ions in the chemical synthesis of ε-Fe2O3nanocrystals that exhibit a huge coercive field10.1063/1.1855615 ↗
52. Reorientation phenomenon in a magnetic phase of ε-Fe2O3 nanocrystal10.1143/JPSJ.74.1946 ↗
53. Synthesis, crystal structure, and magnetic properties of ε-InxFe2–xO3 nanorod-shaped magnets10.1002/adfm.200600581 ↗
54. Structural and magnetic properties of γ- and ε-Fe2O3 nanoparticles dispersed in silica matrix10.1016/j.jnoncrysol.2009.10.001 ↗
55. Nonzero orbital moment in high coercivity ε-Fe2O3 and low-temperature collapse of the magnetocrystalline anisotropy10.1103/PhysRevB.79.094404 ↗
56. Magnetic properties of ε-Fe2O3 particles prepared by sol-gel method10.1023/A:1011088611227 ↗
57. Polymorphous transformations of nanometric iron (III) oxide: a review10.1021/cm200397g ↗
58. First observation of phase transformation of all four Fe2O3 phases (γ→ε→β→α-phase)10.1021/ja9046069 ↗
59. γ-Ferric oxide10.1002/zaac.19633200502 ↗
60. New ferromagnetic variety of ferric oxide
61. Magnetic and thermal properties of ε-Fe2O310.1002/pssa.2210150239 ↗
62. Ultrathin β-FeOOH and ε-Fe2O3 nanowires10.1016/j.cplett.2014.10.014 ↗
63. Novel Synthesis of highly monodispersed γ-Fe2O3/SiO2 and ε-Fe2O3/SiO2 nanocomposite spheres10.1039/B604025J ↗
64. "Nanocasting": using SBA-15 silicas as hard templates to obtain ultrasmall monodispersed γ-Fe2O3 nanoparticles10.1021/jp0647075 ↗
65. Plasma dynamic synthesis and obtaining ultrafine powders of iron oxides with high content of ε-Fe2O310.1016/j.jmmm.2015.12.072 ↗
66. ε-Fe2O3 nanoparticles synthesized in atmospheric-pressure microwave torch10.1016/j.matlet.2013.11.057 ↗
67. Surface decoration of ε-Fe2O3 nanorods by CuO via a two step CVD/sputtering approach10.1002/cvde.201407108 ↗
68. Sol−gel synthesis and micro-Raman characterization of ε-Fe2O3 micro- and nanoparticles10.1021/acs.chemmater.5b03566 ↗
69. ε-Fe2O3: an advanced nanomaterial exhibiting giant coercive field, millimeter-wave ferromagnetic resonance, and magnetoelectric coupling10.1021/cm101967h ↗
70. Structural and magnetic characterization of ε-Fe2O310.1006/jssc.1998.7817 ↗
71. Thermal stability of nanocrystalline ε-Fe2O310.1007/s10973-014-3711-9 ↗
72. Determinatio of thermooptical and transport parameters of ε iron (III) oxide-based nanocomposites by beam deflection spectroscopy10.1016/j.optmat.2015.01.029 ↗
73. 57Fe Mossbauer Spectroscopy of synthesized ε-Fe2O3 nanoparticles10.1134/S0031918X10050133 ↗
74. PLD-assisted VLS growth of aligned ferrite nanorods, nanowires, and nanobelts-synthesis, and properties10.1021/jp064484i ↗
75. Formatio conditions of a magnetically ordered ε-Fe2O3. A FMR in situ study10.1134/S0022476613050065 ↗
76. Preparation of Y3Fe5O12/SiO2 nanocomposites by sol–gel method Influence of modifiers10.1016/S1466-6049(01)00063-0 ↗
77. Formation of nanoparticles of ε-Fe2O3 from yttrium iron garnet in a silica matrix: an unusuall hard magnet with a morin-like transition below 150K10.1021/cm0482838 ↗
78. Microwave absorption of ε-Fe2O3precipitated from sputter deposited Fe-Si-O amorphous thin film by thermal annealing10.1016/j.matlet.2013.10.015 ↗
79. Optimized synthesis of the elusive ε-Fe2O3 phase via sol-gel chemistry10.1021/cm048628m ↗
80. Formation of ε-Fe2O3 phase by the heat treatment of α-Fe2O3/SiO2 nanocomposite10.1016/j.scriptamat.2007.12.009 ↗
81. Thermally induced solid-state synthesis of γ-Fe2O3 nanoparticles and their transformation to α-Fe2O3 via ε-Fe2O310.1023/A:1021226929237 ↗
82. Preparation of the nanowire form of ε-Fe2O3 single crystal and a study of the formation process10.1021/jp806336f ↗
83. The thermal stability of nanocrystalline maghemite Fe2O310.1088/0022-3727/31/20/006 ↗
84. Thermal transformations of aluminium nitrate hydrate10.1016/S0040-6031(01)00703-1 ↗
85. Synthesis, properties, and applications of magnetic iron oxide nanoparticles10.1016/j.pcrysgrow.2008.08.003 ↗
86. Quantifying shapes of nanoparticles using modified circularity and ellipticity measures10.1016/j.measurement.2016.06.021 ↗