Occurrence and stability of ferromagnetism in chemically synthesized cobalt doped $ TiO_{2} $
Abstract We report the development of ferromagnetism in ∼30 nm sized well-characterized $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ powders with x = 0.00015–0.006 and its absence for x > 0.006. In addition, these studies show the effect of Co doping on the structural stability and anatase to rutile phase tra...
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| Autor*in: |
Reddy, K. M. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2007 |
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| Schlagwörter: |
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| Anmerkung: |
© Springer Science+Business Media, LLC 2007 |
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| Übergeordnetes Werk: |
Enthalten in: Journal of materials science / Materials in electronics - Springer US, 1990, 18(2007), 11 vom: 24. Feb., Seite 1137-1142 |
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| Übergeordnetes Werk: |
volume:18 ; year:2007 ; number:11 ; day:24 ; month:02 ; pages:1137-1142 |
| Links: |
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| DOI / URN: |
10.1007/s10854-007-9127-6 |
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OLC2026251894 |
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| 520 | |a Abstract We report the development of ferromagnetism in ∼30 nm sized well-characterized $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ powders with x = 0.00015–0.006 and its absence for x > 0.006. In addition, these studies show the effect of Co doping on the structural stability and anatase to rutile phase transformation. X-ray diffraction data of samples synthesized by a wet chemical method and annealed at 450 °C indicate a limited solubility of ∼1.2% for Co in the anatase $ TiO_{2} $ matrix, and with further increase, the $ CoTiO_{3} $ phase is formed along with increased presence of rutile $ TiO_{2} $. The bandgap (∼3.23 eV) of the anatase $ TiO_{2} $ remained almost unchanged for x < 0.006, but decreased rapidly for x ≥ 0.006 approaching 2.8 eV for x = 0.03. The magnetic data from $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ samples with x = 0.006 showed a coercivity Hc ∼ 150 Oe and a weak magnetic moment of 0.2 $ μ_{B} $/ion at 300 K. The ferromagnetism of $ Ti_{0.994} $$ Co_{0.006} $$ O_{2} $ with open hysteresis loops continue up to a high superparamagnetic blocking temperature TB ∼ 675 K, above which a superparamagnetic behavior was observed. Systematic changes in the structural, magnetic and optical properties suggest that Co doping is an excellent method to tailor the physical properties of $ TiO_{2} $ nanoparticles. | ||
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10.1007/s10854-007-9127-6 doi (DE-627)OLC2026251894 (DE-He213)s10854-007-9127-6-p DE-627 ger DE-627 rakwb eng 600 670 620 VZ Reddy, K. M. verfasserin aut Occurrence and stability of ferromagnetism in chemically synthesized cobalt doped $ TiO_{2} $ 2007 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, LLC 2007 Abstract We report the development of ferromagnetism in ∼30 nm sized well-characterized $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ powders with x = 0.00015–0.006 and its absence for x > 0.006. In addition, these studies show the effect of Co doping on the structural stability and anatase to rutile phase transformation. X-ray diffraction data of samples synthesized by a wet chemical method and annealed at 450 °C indicate a limited solubility of ∼1.2% for Co in the anatase $ TiO_{2} $ matrix, and with further increase, the $ CoTiO_{3} $ phase is formed along with increased presence of rutile $ TiO_{2} $. The bandgap (∼3.23 eV) of the anatase $ TiO_{2} $ remained almost unchanged for x < 0.006, but decreased rapidly for x ≥ 0.006 approaching 2.8 eV for x = 0.03. The magnetic data from $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ samples with x = 0.006 showed a coercivity Hc ∼ 150 Oe and a weak magnetic moment of 0.2 $ μ_{B} $/ion at 300 K. The ferromagnetism of $ Ti_{0.994} $$ Co_{0.006} $$ O_{2} $ with open hysteresis loops continue up to a high superparamagnetic blocking temperature TB ∼ 675 K, above which a superparamagnetic behavior was observed. Systematic changes in the structural, magnetic and optical properties suggest that Co doping is an excellent method to tailor the physical properties of $ TiO_{2} $ nanoparticles. TiO2 SnO2 Rutile TiO2 Nanoparticles Anatase TiO2 Punnoose, A. aut Enthalten in Journal of materials science / Materials in electronics Springer US, 1990 18(2007), 11 vom: 24. Feb., Seite 1137-1142 (DE-627)130863289 (DE-600)1030929-9 (DE-576)023106719 0957-4522 nnns volume:18 year:2007 number:11 day:24 month:02 pages:1137-1142 https://doi.org/10.1007/s10854-007-9127-6 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY GBV_ILN_20 GBV_ILN_21 GBV_ILN_23 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_602 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_4046 GBV_ILN_4305 GBV_ILN_4323 AR 18 2007 11 24 02 1137-1142 |
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10.1007/s10854-007-9127-6 doi (DE-627)OLC2026251894 (DE-He213)s10854-007-9127-6-p DE-627 ger DE-627 rakwb eng 600 670 620 VZ Reddy, K. M. verfasserin aut Occurrence and stability of ferromagnetism in chemically synthesized cobalt doped $ TiO_{2} $ 2007 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, LLC 2007 Abstract We report the development of ferromagnetism in ∼30 nm sized well-characterized $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ powders with x = 0.00015–0.006 and its absence for x > 0.006. In addition, these studies show the effect of Co doping on the structural stability and anatase to rutile phase transformation. X-ray diffraction data of samples synthesized by a wet chemical method and annealed at 450 °C indicate a limited solubility of ∼1.2% for Co in the anatase $ TiO_{2} $ matrix, and with further increase, the $ CoTiO_{3} $ phase is formed along with increased presence of rutile $ TiO_{2} $. The bandgap (∼3.23 eV) of the anatase $ TiO_{2} $ remained almost unchanged for x < 0.006, but decreased rapidly for x ≥ 0.006 approaching 2.8 eV for x = 0.03. The magnetic data from $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ samples with x = 0.006 showed a coercivity Hc ∼ 150 Oe and a weak magnetic moment of 0.2 $ μ_{B} $/ion at 300 K. The ferromagnetism of $ Ti_{0.994} $$ Co_{0.006} $$ O_{2} $ with open hysteresis loops continue up to a high superparamagnetic blocking temperature TB ∼ 675 K, above which a superparamagnetic behavior was observed. Systematic changes in the structural, magnetic and optical properties suggest that Co doping is an excellent method to tailor the physical properties of $ TiO_{2} $ nanoparticles. TiO2 SnO2 Rutile TiO2 Nanoparticles Anatase TiO2 Punnoose, A. aut Enthalten in Journal of materials science / Materials in electronics Springer US, 1990 18(2007), 11 vom: 24. Feb., Seite 1137-1142 (DE-627)130863289 (DE-600)1030929-9 (DE-576)023106719 0957-4522 nnns volume:18 year:2007 number:11 day:24 month:02 pages:1137-1142 https://doi.org/10.1007/s10854-007-9127-6 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY GBV_ILN_20 GBV_ILN_21 GBV_ILN_23 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_602 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_4046 GBV_ILN_4305 GBV_ILN_4323 AR 18 2007 11 24 02 1137-1142 |
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10.1007/s10854-007-9127-6 doi (DE-627)OLC2026251894 (DE-He213)s10854-007-9127-6-p DE-627 ger DE-627 rakwb eng 600 670 620 VZ Reddy, K. M. verfasserin aut Occurrence and stability of ferromagnetism in chemically synthesized cobalt doped $ TiO_{2} $ 2007 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, LLC 2007 Abstract We report the development of ferromagnetism in ∼30 nm sized well-characterized $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ powders with x = 0.00015–0.006 and its absence for x > 0.006. In addition, these studies show the effect of Co doping on the structural stability and anatase to rutile phase transformation. X-ray diffraction data of samples synthesized by a wet chemical method and annealed at 450 °C indicate a limited solubility of ∼1.2% for Co in the anatase $ TiO_{2} $ matrix, and with further increase, the $ CoTiO_{3} $ phase is formed along with increased presence of rutile $ TiO_{2} $. The bandgap (∼3.23 eV) of the anatase $ TiO_{2} $ remained almost unchanged for x < 0.006, but decreased rapidly for x ≥ 0.006 approaching 2.8 eV for x = 0.03. The magnetic data from $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ samples with x = 0.006 showed a coercivity Hc ∼ 150 Oe and a weak magnetic moment of 0.2 $ μ_{B} $/ion at 300 K. The ferromagnetism of $ Ti_{0.994} $$ Co_{0.006} $$ O_{2} $ with open hysteresis loops continue up to a high superparamagnetic blocking temperature TB ∼ 675 K, above which a superparamagnetic behavior was observed. Systematic changes in the structural, magnetic and optical properties suggest that Co doping is an excellent method to tailor the physical properties of $ TiO_{2} $ nanoparticles. TiO2 SnO2 Rutile TiO2 Nanoparticles Anatase TiO2 Punnoose, A. aut Enthalten in Journal of materials science / Materials in electronics Springer US, 1990 18(2007), 11 vom: 24. Feb., Seite 1137-1142 (DE-627)130863289 (DE-600)1030929-9 (DE-576)023106719 0957-4522 nnns volume:18 year:2007 number:11 day:24 month:02 pages:1137-1142 https://doi.org/10.1007/s10854-007-9127-6 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY GBV_ILN_20 GBV_ILN_21 GBV_ILN_23 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_602 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_4046 GBV_ILN_4305 GBV_ILN_4323 AR 18 2007 11 24 02 1137-1142 |
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10.1007/s10854-007-9127-6 doi (DE-627)OLC2026251894 (DE-He213)s10854-007-9127-6-p DE-627 ger DE-627 rakwb eng 600 670 620 VZ Reddy, K. M. verfasserin aut Occurrence and stability of ferromagnetism in chemically synthesized cobalt doped $ TiO_{2} $ 2007 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, LLC 2007 Abstract We report the development of ferromagnetism in ∼30 nm sized well-characterized $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ powders with x = 0.00015–0.006 and its absence for x > 0.006. In addition, these studies show the effect of Co doping on the structural stability and anatase to rutile phase transformation. X-ray diffraction data of samples synthesized by a wet chemical method and annealed at 450 °C indicate a limited solubility of ∼1.2% for Co in the anatase $ TiO_{2} $ matrix, and with further increase, the $ CoTiO_{3} $ phase is formed along with increased presence of rutile $ TiO_{2} $. The bandgap (∼3.23 eV) of the anatase $ TiO_{2} $ remained almost unchanged for x < 0.006, but decreased rapidly for x ≥ 0.006 approaching 2.8 eV for x = 0.03. The magnetic data from $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ samples with x = 0.006 showed a coercivity Hc ∼ 150 Oe and a weak magnetic moment of 0.2 $ μ_{B} $/ion at 300 K. The ferromagnetism of $ Ti_{0.994} $$ Co_{0.006} $$ O_{2} $ with open hysteresis loops continue up to a high superparamagnetic blocking temperature TB ∼ 675 K, above which a superparamagnetic behavior was observed. Systematic changes in the structural, magnetic and optical properties suggest that Co doping is an excellent method to tailor the physical properties of $ TiO_{2} $ nanoparticles. TiO2 SnO2 Rutile TiO2 Nanoparticles Anatase TiO2 Punnoose, A. aut Enthalten in Journal of materials science / Materials in electronics Springer US, 1990 18(2007), 11 vom: 24. Feb., Seite 1137-1142 (DE-627)130863289 (DE-600)1030929-9 (DE-576)023106719 0957-4522 nnns volume:18 year:2007 number:11 day:24 month:02 pages:1137-1142 https://doi.org/10.1007/s10854-007-9127-6 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY GBV_ILN_20 GBV_ILN_21 GBV_ILN_23 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_602 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_4046 GBV_ILN_4305 GBV_ILN_4323 AR 18 2007 11 24 02 1137-1142 |
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10.1007/s10854-007-9127-6 doi (DE-627)OLC2026251894 (DE-He213)s10854-007-9127-6-p DE-627 ger DE-627 rakwb eng 600 670 620 VZ Reddy, K. M. verfasserin aut Occurrence and stability of ferromagnetism in chemically synthesized cobalt doped $ TiO_{2} $ 2007 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, LLC 2007 Abstract We report the development of ferromagnetism in ∼30 nm sized well-characterized $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ powders with x = 0.00015–0.006 and its absence for x > 0.006. In addition, these studies show the effect of Co doping on the structural stability and anatase to rutile phase transformation. X-ray diffraction data of samples synthesized by a wet chemical method and annealed at 450 °C indicate a limited solubility of ∼1.2% for Co in the anatase $ TiO_{2} $ matrix, and with further increase, the $ CoTiO_{3} $ phase is formed along with increased presence of rutile $ TiO_{2} $. The bandgap (∼3.23 eV) of the anatase $ TiO_{2} $ remained almost unchanged for x < 0.006, but decreased rapidly for x ≥ 0.006 approaching 2.8 eV for x = 0.03. The magnetic data from $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ samples with x = 0.006 showed a coercivity Hc ∼ 150 Oe and a weak magnetic moment of 0.2 $ μ_{B} $/ion at 300 K. The ferromagnetism of $ Ti_{0.994} $$ Co_{0.006} $$ O_{2} $ with open hysteresis loops continue up to a high superparamagnetic blocking temperature TB ∼ 675 K, above which a superparamagnetic behavior was observed. Systematic changes in the structural, magnetic and optical properties suggest that Co doping is an excellent method to tailor the physical properties of $ TiO_{2} $ nanoparticles. TiO2 SnO2 Rutile TiO2 Nanoparticles Anatase TiO2 Punnoose, A. aut Enthalten in Journal of materials science / Materials in electronics Springer US, 1990 18(2007), 11 vom: 24. Feb., Seite 1137-1142 (DE-627)130863289 (DE-600)1030929-9 (DE-576)023106719 0957-4522 nnns volume:18 year:2007 number:11 day:24 month:02 pages:1137-1142 https://doi.org/10.1007/s10854-007-9127-6 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY GBV_ILN_20 GBV_ILN_21 GBV_ILN_23 GBV_ILN_30 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_62 GBV_ILN_65 GBV_ILN_70 GBV_ILN_602 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_4046 GBV_ILN_4305 GBV_ILN_4323 AR 18 2007 11 24 02 1137-1142 |
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Enthalten in Journal of materials science / Materials in electronics 18(2007), 11 vom: 24. Feb., Seite 1137-1142 volume:18 year:2007 number:11 day:24 month:02 pages:1137-1142 |
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Enthalten in Journal of materials science / Materials in electronics 18(2007), 11 vom: 24. Feb., Seite 1137-1142 volume:18 year:2007 number:11 day:24 month:02 pages:1137-1142 |
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Reddy, K. M. ddc 600 misc TiO2 misc SnO2 misc Rutile misc TiO2 Nanoparticles misc Anatase TiO2 Occurrence and stability of ferromagnetism in chemically synthesized cobalt doped $ TiO_{2} $ |
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occurrence and stability of ferromagnetism in chemically synthesized cobalt doped $ tio_{2} $ |
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Occurrence and stability of ferromagnetism in chemically synthesized cobalt doped $ TiO_{2} $ |
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Abstract We report the development of ferromagnetism in ∼30 nm sized well-characterized $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ powders with x = 0.00015–0.006 and its absence for x > 0.006. In addition, these studies show the effect of Co doping on the structural stability and anatase to rutile phase transformation. X-ray diffraction data of samples synthesized by a wet chemical method and annealed at 450 °C indicate a limited solubility of ∼1.2% for Co in the anatase $ TiO_{2} $ matrix, and with further increase, the $ CoTiO_{3} $ phase is formed along with increased presence of rutile $ TiO_{2} $. The bandgap (∼3.23 eV) of the anatase $ TiO_{2} $ remained almost unchanged for x < 0.006, but decreased rapidly for x ≥ 0.006 approaching 2.8 eV for x = 0.03. The magnetic data from $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ samples with x = 0.006 showed a coercivity Hc ∼ 150 Oe and a weak magnetic moment of 0.2 $ μ_{B} $/ion at 300 K. The ferromagnetism of $ Ti_{0.994} $$ Co_{0.006} $$ O_{2} $ with open hysteresis loops continue up to a high superparamagnetic blocking temperature TB ∼ 675 K, above which a superparamagnetic behavior was observed. Systematic changes in the structural, magnetic and optical properties suggest that Co doping is an excellent method to tailor the physical properties of $ TiO_{2} $ nanoparticles. © Springer Science+Business Media, LLC 2007 |
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Abstract We report the development of ferromagnetism in ∼30 nm sized well-characterized $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ powders with x = 0.00015–0.006 and its absence for x > 0.006. In addition, these studies show the effect of Co doping on the structural stability and anatase to rutile phase transformation. X-ray diffraction data of samples synthesized by a wet chemical method and annealed at 450 °C indicate a limited solubility of ∼1.2% for Co in the anatase $ TiO_{2} $ matrix, and with further increase, the $ CoTiO_{3} $ phase is formed along with increased presence of rutile $ TiO_{2} $. The bandgap (∼3.23 eV) of the anatase $ TiO_{2} $ remained almost unchanged for x < 0.006, but decreased rapidly for x ≥ 0.006 approaching 2.8 eV for x = 0.03. The magnetic data from $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ samples with x = 0.006 showed a coercivity Hc ∼ 150 Oe and a weak magnetic moment of 0.2 $ μ_{B} $/ion at 300 K. The ferromagnetism of $ Ti_{0.994} $$ Co_{0.006} $$ O_{2} $ with open hysteresis loops continue up to a high superparamagnetic blocking temperature TB ∼ 675 K, above which a superparamagnetic behavior was observed. Systematic changes in the structural, magnetic and optical properties suggest that Co doping is an excellent method to tailor the physical properties of $ TiO_{2} $ nanoparticles. © Springer Science+Business Media, LLC 2007 |
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Abstract We report the development of ferromagnetism in ∼30 nm sized well-characterized $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ powders with x = 0.00015–0.006 and its absence for x > 0.006. In addition, these studies show the effect of Co doping on the structural stability and anatase to rutile phase transformation. X-ray diffraction data of samples synthesized by a wet chemical method and annealed at 450 °C indicate a limited solubility of ∼1.2% for Co in the anatase $ TiO_{2} $ matrix, and with further increase, the $ CoTiO_{3} $ phase is formed along with increased presence of rutile $ TiO_{2} $. The bandgap (∼3.23 eV) of the anatase $ TiO_{2} $ remained almost unchanged for x < 0.006, but decreased rapidly for x ≥ 0.006 approaching 2.8 eV for x = 0.03. The magnetic data from $ Ti_{1−x} $$ Co_{x} $$ O_{2} $ samples with x = 0.006 showed a coercivity Hc ∼ 150 Oe and a weak magnetic moment of 0.2 $ μ_{B} $/ion at 300 K. The ferromagnetism of $ Ti_{0.994} $$ Co_{0.006} $$ O_{2} $ with open hysteresis loops continue up to a high superparamagnetic blocking temperature TB ∼ 675 K, above which a superparamagnetic behavior was observed. Systematic changes in the structural, magnetic and optical properties suggest that Co doping is an excellent method to tailor the physical properties of $ TiO_{2} $ nanoparticles. © Springer Science+Business Media, LLC 2007 |
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