Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization
Cobalt substituted nickel spinel ferrites were synthesized in the form of Ni 1 - x...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Pubby, Kunal [verfasserIn] Meena, S.S. [verfasserIn] Yusuf, S.M. [verfasserIn] Bindra Narang, Sukhleen [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2018 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Journal of magnetism and magnetic materials - Amsterdam : North-Holland Publ. Co., 1975, 466, Seite 430-445 |
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| Übergeordnetes Werk: |
volume:466 ; pages:430-445 |
| DOI / URN: |
10.1016/j.jmmm.2018.07.038 |
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| Katalog-ID: |
ELV000225258 |
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| 245 | 1 | 0 | |a Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization |
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| 520 | |a Cobalt substituted nickel spinel ferrites were synthesized in the form of Ni 1 - x Co x Fe 2 O 4 ( x = 0 - 1 , Δ x = 0.15 ) via Pechini’s sol–gel citrate method with final sintering at 1000 °C for 6 h. Structural purity of the prepared ferrites is examined by using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Thermo-gravimetric and differential thermal analysis (TG-DTA) show that the formation of spinel phase is completed upto 700 °C. Lattice constant, cationic distribution and cationic site parameters are estimated from XRD data. For the first time, lattice parameter ( a ) is determined using four different methods and quite similar values are obtained in those. Characteristic peaks of nickel ferrites are observed in the Raman spectrum of each ferrite composition. Grain size (80–95 nm) is observed to be higher than crystallite size (26.2–31.8 nm) due to agglomeration of grains. Mössbauer spectra recorded at 300 K temperature show the presence of iron in only +3 valency. Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped cobalt. This paper also presents the electromagnetic and shielding properties of these Ni–Co ferrites in X-band (8.2–12.4 GHz) frequency range using vector network analyzer (VNA). The analysis of shielding effectiveness shows that increasing the amount of cobalt in nickel ferrites results in increase in shielding efficiency of the ferrites which proves the utility of this specific doping. | ||
| 650 | 4 | |a Nickel spinel ferrites | |
| 650 | 4 | |a X-ray diffraction | |
| 650 | 4 | |a Lattice constant | |
| 650 | 4 | |a Raman spectra | |
| 650 | 4 | |a Mössbauer spectroscopy | |
| 650 | 4 | |a X-band absorption | |
| 700 | 1 | |a Meena, S.S. |e verfasserin |4 aut | |
| 700 | 1 | |a Yusuf, S.M. |e verfasserin |4 aut | |
| 700 | 1 | |a Bindra Narang, Sukhleen |e verfasserin |4 aut | |
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| 773 | 1 | 8 | |g volume:466 |g pages:430-445 |
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10.1016/j.jmmm.2018.07.038 doi (DE-627)ELV000225258 (ELSEVIER)S0304-8853(17)33599-0 DE-627 ger DE-627 rda eng 530 DE-600 33.16 bkl Pubby, Kunal verfasserin aut Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Cobalt substituted nickel spinel ferrites were synthesized in the form of Ni 1 - x Co x Fe 2 O 4 ( x = 0 - 1 , Δ x = 0.15 ) via Pechini’s sol–gel citrate method with final sintering at 1000 °C for 6 h. Structural purity of the prepared ferrites is examined by using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Thermo-gravimetric and differential thermal analysis (TG-DTA) show that the formation of spinel phase is completed upto 700 °C. Lattice constant, cationic distribution and cationic site parameters are estimated from XRD data. For the first time, lattice parameter ( a ) is determined using four different methods and quite similar values are obtained in those. Characteristic peaks of nickel ferrites are observed in the Raman spectrum of each ferrite composition. Grain size (80–95 nm) is observed to be higher than crystallite size (26.2–31.8 nm) due to agglomeration of grains. Mössbauer spectra recorded at 300 K temperature show the presence of iron in only +3 valency. Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped cobalt. This paper also presents the electromagnetic and shielding properties of these Ni–Co ferrites in X-band (8.2–12.4 GHz) frequency range using vector network analyzer (VNA). The analysis of shielding effectiveness shows that increasing the amount of cobalt in nickel ferrites results in increase in shielding efficiency of the ferrites which proves the utility of this specific doping. Nickel spinel ferrites X-ray diffraction Lattice constant Raman spectra Mössbauer spectroscopy X-band absorption Meena, S.S. verfasserin aut Yusuf, S.M. verfasserin aut Bindra Narang, Sukhleen verfasserin aut Enthalten in Journal of magnetism and magnetic materials Amsterdam : North-Holland Publ. Co., 1975 466, Seite 430-445 Online-Ressource (DE-627)271175958 (DE-600)1479000-2 (DE-576)078412331 0304-8853 nnns volume:466 pages:430-445 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 33.16 Elektrizität Magnetismus AR 466 430-445 |
| spelling |
10.1016/j.jmmm.2018.07.038 doi (DE-627)ELV000225258 (ELSEVIER)S0304-8853(17)33599-0 DE-627 ger DE-627 rda eng 530 DE-600 33.16 bkl Pubby, Kunal verfasserin aut Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Cobalt substituted nickel spinel ferrites were synthesized in the form of Ni 1 - x Co x Fe 2 O 4 ( x = 0 - 1 , Δ x = 0.15 ) via Pechini’s sol–gel citrate method with final sintering at 1000 °C for 6 h. Structural purity of the prepared ferrites is examined by using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Thermo-gravimetric and differential thermal analysis (TG-DTA) show that the formation of spinel phase is completed upto 700 °C. Lattice constant, cationic distribution and cationic site parameters are estimated from XRD data. For the first time, lattice parameter ( a ) is determined using four different methods and quite similar values are obtained in those. Characteristic peaks of nickel ferrites are observed in the Raman spectrum of each ferrite composition. Grain size (80–95 nm) is observed to be higher than crystallite size (26.2–31.8 nm) due to agglomeration of grains. Mössbauer spectra recorded at 300 K temperature show the presence of iron in only +3 valency. Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped cobalt. This paper also presents the electromagnetic and shielding properties of these Ni–Co ferrites in X-band (8.2–12.4 GHz) frequency range using vector network analyzer (VNA). The analysis of shielding effectiveness shows that increasing the amount of cobalt in nickel ferrites results in increase in shielding efficiency of the ferrites which proves the utility of this specific doping. Nickel spinel ferrites X-ray diffraction Lattice constant Raman spectra Mössbauer spectroscopy X-band absorption Meena, S.S. verfasserin aut Yusuf, S.M. verfasserin aut Bindra Narang, Sukhleen verfasserin aut Enthalten in Journal of magnetism and magnetic materials Amsterdam : North-Holland Publ. Co., 1975 466, Seite 430-445 Online-Ressource (DE-627)271175958 (DE-600)1479000-2 (DE-576)078412331 0304-8853 nnns volume:466 pages:430-445 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 33.16 Elektrizität Magnetismus AR 466 430-445 |
| allfields_unstemmed |
10.1016/j.jmmm.2018.07.038 doi (DE-627)ELV000225258 (ELSEVIER)S0304-8853(17)33599-0 DE-627 ger DE-627 rda eng 530 DE-600 33.16 bkl Pubby, Kunal verfasserin aut Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Cobalt substituted nickel spinel ferrites were synthesized in the form of Ni 1 - x Co x Fe 2 O 4 ( x = 0 - 1 , Δ x = 0.15 ) via Pechini’s sol–gel citrate method with final sintering at 1000 °C for 6 h. Structural purity of the prepared ferrites is examined by using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Thermo-gravimetric and differential thermal analysis (TG-DTA) show that the formation of spinel phase is completed upto 700 °C. Lattice constant, cationic distribution and cationic site parameters are estimated from XRD data. For the first time, lattice parameter ( a ) is determined using four different methods and quite similar values are obtained in those. Characteristic peaks of nickel ferrites are observed in the Raman spectrum of each ferrite composition. Grain size (80–95 nm) is observed to be higher than crystallite size (26.2–31.8 nm) due to agglomeration of grains. Mössbauer spectra recorded at 300 K temperature show the presence of iron in only +3 valency. Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped cobalt. This paper also presents the electromagnetic and shielding properties of these Ni–Co ferrites in X-band (8.2–12.4 GHz) frequency range using vector network analyzer (VNA). The analysis of shielding effectiveness shows that increasing the amount of cobalt in nickel ferrites results in increase in shielding efficiency of the ferrites which proves the utility of this specific doping. Nickel spinel ferrites X-ray diffraction Lattice constant Raman spectra Mössbauer spectroscopy X-band absorption Meena, S.S. verfasserin aut Yusuf, S.M. verfasserin aut Bindra Narang, Sukhleen verfasserin aut Enthalten in Journal of magnetism and magnetic materials Amsterdam : North-Holland Publ. Co., 1975 466, Seite 430-445 Online-Ressource (DE-627)271175958 (DE-600)1479000-2 (DE-576)078412331 0304-8853 nnns volume:466 pages:430-445 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 33.16 Elektrizität Magnetismus AR 466 430-445 |
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10.1016/j.jmmm.2018.07.038 doi (DE-627)ELV000225258 (ELSEVIER)S0304-8853(17)33599-0 DE-627 ger DE-627 rda eng 530 DE-600 33.16 bkl Pubby, Kunal verfasserin aut Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization 2018 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Cobalt substituted nickel spinel ferrites were synthesized in the form of Ni 1 - x Co x Fe 2 O 4 ( x = 0 - 1 , Δ x = 0.15 ) via Pechini’s sol–gel citrate method with final sintering at 1000 °C for 6 h. Structural purity of the prepared ferrites is examined by using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Thermo-gravimetric and differential thermal analysis (TG-DTA) show that the formation of spinel phase is completed upto 700 °C. Lattice constant, cationic distribution and cationic site parameters are estimated from XRD data. For the first time, lattice parameter ( a ) is determined using four different methods and quite similar values are obtained in those. Characteristic peaks of nickel ferrites are observed in the Raman spectrum of each ferrite composition. Grain size (80–95 nm) is observed to be higher than crystallite size (26.2–31.8 nm) due to agglomeration of grains. Mössbauer spectra recorded at 300 K temperature show the presence of iron in only +3 valency. Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped cobalt. This paper also presents the electromagnetic and shielding properties of these Ni–Co ferrites in X-band (8.2–12.4 GHz) frequency range using vector network analyzer (VNA). The analysis of shielding effectiveness shows that increasing the amount of cobalt in nickel ferrites results in increase in shielding efficiency of the ferrites which proves the utility of this specific doping. Nickel spinel ferrites X-ray diffraction Lattice constant Raman spectra Mössbauer spectroscopy X-band absorption Meena, S.S. verfasserin aut Yusuf, S.M. verfasserin aut Bindra Narang, Sukhleen verfasserin aut Enthalten in Journal of magnetism and magnetic materials Amsterdam : North-Holland Publ. Co., 1975 466, Seite 430-445 Online-Ressource (DE-627)271175958 (DE-600)1479000-2 (DE-576)078412331 0304-8853 nnns volume:466 pages:430-445 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 33.16 Elektrizität Magnetismus AR 466 430-445 |
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530 DE-600 33.16 bkl Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization Nickel spinel ferrites X-ray diffraction Lattice constant Raman spectra Mössbauer spectroscopy X-band absorption |
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ddc 530 bkl 33.16 misc Nickel spinel ferrites misc X-ray diffraction misc Lattice constant misc Raman spectra misc Mössbauer spectroscopy misc X-band absorption |
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ddc 530 bkl 33.16 misc Nickel spinel ferrites misc X-ray diffraction misc Lattice constant misc Raman spectra misc Mössbauer spectroscopy misc X-band absorption |
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ddc 530 bkl 33.16 misc Nickel spinel ferrites misc X-ray diffraction misc Lattice constant misc Raman spectra misc Mössbauer spectroscopy misc X-band absorption |
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Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization |
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Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization |
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Journal of magnetism and magnetic materials |
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Pubby, Kunal Meena, S.S. Yusuf, S.M. Bindra Narang, Sukhleen |
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10.1016/j.jmmm.2018.07.038 |
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cobalt substituted nickel ferrites via pechini’s sol–gel citrate route: x-band electromagnetic characterization |
| title_auth |
Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization |
| abstract |
Cobalt substituted nickel spinel ferrites were synthesized in the form of Ni 1 - x Co x Fe 2 O 4 ( x = 0 - 1 , Δ x = 0.15 ) via Pechini’s sol–gel citrate method with final sintering at 1000 °C for 6 h. Structural purity of the prepared ferrites is examined by using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Thermo-gravimetric and differential thermal analysis (TG-DTA) show that the formation of spinel phase is completed upto 700 °C. Lattice constant, cationic distribution and cationic site parameters are estimated from XRD data. For the first time, lattice parameter ( a ) is determined using four different methods and quite similar values are obtained in those. Characteristic peaks of nickel ferrites are observed in the Raman spectrum of each ferrite composition. Grain size (80–95 nm) is observed to be higher than crystallite size (26.2–31.8 nm) due to agglomeration of grains. Mössbauer spectra recorded at 300 K temperature show the presence of iron in only +3 valency. Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped cobalt. This paper also presents the electromagnetic and shielding properties of these Ni–Co ferrites in X-band (8.2–12.4 GHz) frequency range using vector network analyzer (VNA). The analysis of shielding effectiveness shows that increasing the amount of cobalt in nickel ferrites results in increase in shielding efficiency of the ferrites which proves the utility of this specific doping. |
| abstractGer |
Cobalt substituted nickel spinel ferrites were synthesized in the form of Ni 1 - x Co x Fe 2 O 4 ( x = 0 - 1 , Δ x = 0.15 ) via Pechini’s sol–gel citrate method with final sintering at 1000 °C for 6 h. Structural purity of the prepared ferrites is examined by using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Thermo-gravimetric and differential thermal analysis (TG-DTA) show that the formation of spinel phase is completed upto 700 °C. Lattice constant, cationic distribution and cationic site parameters are estimated from XRD data. For the first time, lattice parameter ( a ) is determined using four different methods and quite similar values are obtained in those. Characteristic peaks of nickel ferrites are observed in the Raman spectrum of each ferrite composition. Grain size (80–95 nm) is observed to be higher than crystallite size (26.2–31.8 nm) due to agglomeration of grains. Mössbauer spectra recorded at 300 K temperature show the presence of iron in only +3 valency. Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped cobalt. This paper also presents the electromagnetic and shielding properties of these Ni–Co ferrites in X-band (8.2–12.4 GHz) frequency range using vector network analyzer (VNA). The analysis of shielding effectiveness shows that increasing the amount of cobalt in nickel ferrites results in increase in shielding efficiency of the ferrites which proves the utility of this specific doping. |
| abstract_unstemmed |
Cobalt substituted nickel spinel ferrites were synthesized in the form of Ni 1 - x Co x Fe 2 O 4 ( x = 0 - 1 , Δ x = 0.15 ) via Pechini’s sol–gel citrate method with final sintering at 1000 °C for 6 h. Structural purity of the prepared ferrites is examined by using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Thermo-gravimetric and differential thermal analysis (TG-DTA) show that the formation of spinel phase is completed upto 700 °C. Lattice constant, cationic distribution and cationic site parameters are estimated from XRD data. For the first time, lattice parameter ( a ) is determined using four different methods and quite similar values are obtained in those. Characteristic peaks of nickel ferrites are observed in the Raman spectrum of each ferrite composition. Grain size (80–95 nm) is observed to be higher than crystallite size (26.2–31.8 nm) due to agglomeration of grains. Mössbauer spectra recorded at 300 K temperature show the presence of iron in only +3 valency. Variations of isomer shift, hyperfine field, quadrupole splitting and line width are analyzed with the amount of doped cobalt. This paper also presents the electromagnetic and shielding properties of these Ni–Co ferrites in X-band (8.2–12.4 GHz) frequency range using vector network analyzer (VNA). The analysis of shielding effectiveness shows that increasing the amount of cobalt in nickel ferrites results in increase in shielding efficiency of the ferrites which proves the utility of this specific doping. |
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Cobalt substituted nickel ferrites via Pechini’s sol–gel citrate route: X-band electromagnetic characterization |
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