Reaction kinetic studies of strontium hexaferrite nanoparticles synthesized by co-precipitation method
Abstract Nano crystalline strontium hexaferrite, $ SrFe_{12} $$ O_{19} $ powders have been synthesized using co-precipitation method. The ferrite precursors were obtained from aqueous mixtures of strontium chloride and ferric chloride by precipitating strontium and iron using 7.5 M sodium hydroxide...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Tyagi, Sachin [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2010 |
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| Schlagwörter: |
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| Anmerkung: |
© Indian Institute of Metals 2010 |
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| Übergeordnetes Werk: |
Enthalten in: Transactions of the Indian Institute of Metals - Springer-Verlag, 1948, 63(2010), 1 vom: Feb., Seite 15-19 |
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| Übergeordnetes Werk: |
volume:63 ; year:2010 ; number:1 ; month:02 ; pages:15-19 |
| Links: |
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| DOI / URN: |
10.1007/s12666-010-0003-3 |
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OLC2070818489 |
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| 520 | |a Abstract Nano crystalline strontium hexaferrite, $ SrFe_{12} $$ O_{19} $ powders have been synthesized using co-precipitation method. The ferrite precursors were obtained from aqueous mixtures of strontium chloride and ferric chloride by precipitating strontium and iron using 7.5 M sodium hydroxide solution. These precursors were heat treated at 800 and 1200°C in nitrogen atmosphere. The decomposition behaviour and reaction kinetics were investigated by means of DSC/DTG/TG for three heating rates. The various phases associated therein were identified by X-ray diffraction (XRD). From field emission scanning electron microscopy (FESEM) study, the formations of nonporous ultrafine particles have been confirmed. About 5 to 10% of the needle like crystals in the ‘as synthesized, condition were transformed to pyramidal structure and most of the crystals are found to have plate like hexagonal structures with increase in heat treatment temperatures. Activation energies and Avrami index ‘n’ were obtained using Johnson-Mehl-Avrami (JMA) equation. The reaction in the temperature range of 800 to 1200°C, proceeds as, instantaneous nucleation and three dimensional growth with activation energy of 168.33 kJ/mole. | ||
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10.1007/s12666-010-0003-3 doi (DE-627)OLC2070818489 (DE-He213)s12666-010-0003-3-p DE-627 ger DE-627 rakwb eng 620 660 670 VZ 19,1 ssgn Tyagi, Sachin verfasserin aut Reaction kinetic studies of strontium hexaferrite nanoparticles synthesized by co-precipitation method 2010 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Indian Institute of Metals 2010 Abstract Nano crystalline strontium hexaferrite, $ SrFe_{12} $$ O_{19} $ powders have been synthesized using co-precipitation method. The ferrite precursors were obtained from aqueous mixtures of strontium chloride and ferric chloride by precipitating strontium and iron using 7.5 M sodium hydroxide solution. These precursors were heat treated at 800 and 1200°C in nitrogen atmosphere. The decomposition behaviour and reaction kinetics were investigated by means of DSC/DTG/TG for three heating rates. The various phases associated therein were identified by X-ray diffraction (XRD). From field emission scanning electron microscopy (FESEM) study, the formations of nonporous ultrafine particles have been confirmed. About 5 to 10% of the needle like crystals in the ‘as synthesized, condition were transformed to pyramidal structure and most of the crystals are found to have plate like hexagonal structures with increase in heat treatment temperatures. Activation energies and Avrami index ‘n’ were obtained using Johnson-Mehl-Avrami (JMA) equation. The reaction in the temperature range of 800 to 1200°C, proceeds as, instantaneous nucleation and three dimensional growth with activation energy of 168.33 kJ/mole. nucleation avrami index activation energy Agarwala, R. C. aut Agarwala, Vijaya aut Enthalten in Transactions of the Indian Institute of Metals Springer-Verlag, 1948 63(2010), 1 vom: Feb., Seite 15-19 (DE-627)12936214X (DE-600)160952-X (DE-576)014734834 0972-2815 nnns volume:63 year:2010 number:1 month:02 pages:15-19 https://doi.org/10.1007/s12666-010-0003-3 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-GGO GBV_ILN_70 GBV_ILN_2027 AR 63 2010 1 02 15-19 |
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10.1007/s12666-010-0003-3 doi (DE-627)OLC2070818489 (DE-He213)s12666-010-0003-3-p DE-627 ger DE-627 rakwb eng 620 660 670 VZ 19,1 ssgn Tyagi, Sachin verfasserin aut Reaction kinetic studies of strontium hexaferrite nanoparticles synthesized by co-precipitation method 2010 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Indian Institute of Metals 2010 Abstract Nano crystalline strontium hexaferrite, $ SrFe_{12} $$ O_{19} $ powders have been synthesized using co-precipitation method. The ferrite precursors were obtained from aqueous mixtures of strontium chloride and ferric chloride by precipitating strontium and iron using 7.5 M sodium hydroxide solution. These precursors were heat treated at 800 and 1200°C in nitrogen atmosphere. The decomposition behaviour and reaction kinetics were investigated by means of DSC/DTG/TG for three heating rates. The various phases associated therein were identified by X-ray diffraction (XRD). From field emission scanning electron microscopy (FESEM) study, the formations of nonporous ultrafine particles have been confirmed. About 5 to 10% of the needle like crystals in the ‘as synthesized, condition were transformed to pyramidal structure and most of the crystals are found to have plate like hexagonal structures with increase in heat treatment temperatures. Activation energies and Avrami index ‘n’ were obtained using Johnson-Mehl-Avrami (JMA) equation. The reaction in the temperature range of 800 to 1200°C, proceeds as, instantaneous nucleation and three dimensional growth with activation energy of 168.33 kJ/mole. nucleation avrami index activation energy Agarwala, R. C. aut Agarwala, Vijaya aut Enthalten in Transactions of the Indian Institute of Metals Springer-Verlag, 1948 63(2010), 1 vom: Feb., Seite 15-19 (DE-627)12936214X (DE-600)160952-X (DE-576)014734834 0972-2815 nnns volume:63 year:2010 number:1 month:02 pages:15-19 https://doi.org/10.1007/s12666-010-0003-3 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-GGO GBV_ILN_70 GBV_ILN_2027 AR 63 2010 1 02 15-19 |
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Abstract Nano crystalline strontium hexaferrite, $ SrFe_{12} $$ O_{19} $ powders have been synthesized using co-precipitation method. The ferrite precursors were obtained from aqueous mixtures of strontium chloride and ferric chloride by precipitating strontium and iron using 7.5 M sodium hydroxide solution. These precursors were heat treated at 800 and 1200°C in nitrogen atmosphere. The decomposition behaviour and reaction kinetics were investigated by means of DSC/DTG/TG for three heating rates. The various phases associated therein were identified by X-ray diffraction (XRD). From field emission scanning electron microscopy (FESEM) study, the formations of nonporous ultrafine particles have been confirmed. About 5 to 10% of the needle like crystals in the ‘as synthesized, condition were transformed to pyramidal structure and most of the crystals are found to have plate like hexagonal structures with increase in heat treatment temperatures. Activation energies and Avrami index ‘n’ were obtained using Johnson-Mehl-Avrami (JMA) equation. The reaction in the temperature range of 800 to 1200°C, proceeds as, instantaneous nucleation and three dimensional growth with activation energy of 168.33 kJ/mole. © Indian Institute of Metals 2010 |
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Abstract Nano crystalline strontium hexaferrite, $ SrFe_{12} $$ O_{19} $ powders have been synthesized using co-precipitation method. The ferrite precursors were obtained from aqueous mixtures of strontium chloride and ferric chloride by precipitating strontium and iron using 7.5 M sodium hydroxide solution. These precursors were heat treated at 800 and 1200°C in nitrogen atmosphere. The decomposition behaviour and reaction kinetics were investigated by means of DSC/DTG/TG for three heating rates. The various phases associated therein were identified by X-ray diffraction (XRD). From field emission scanning electron microscopy (FESEM) study, the formations of nonporous ultrafine particles have been confirmed. About 5 to 10% of the needle like crystals in the ‘as synthesized, condition were transformed to pyramidal structure and most of the crystals are found to have plate like hexagonal structures with increase in heat treatment temperatures. Activation energies and Avrami index ‘n’ were obtained using Johnson-Mehl-Avrami (JMA) equation. The reaction in the temperature range of 800 to 1200°C, proceeds as, instantaneous nucleation and three dimensional growth with activation energy of 168.33 kJ/mole. © Indian Institute of Metals 2010 |
| abstract_unstemmed |
Abstract Nano crystalline strontium hexaferrite, $ SrFe_{12} $$ O_{19} $ powders have been synthesized using co-precipitation method. The ferrite precursors were obtained from aqueous mixtures of strontium chloride and ferric chloride by precipitating strontium and iron using 7.5 M sodium hydroxide solution. These precursors were heat treated at 800 and 1200°C in nitrogen atmosphere. The decomposition behaviour and reaction kinetics were investigated by means of DSC/DTG/TG for three heating rates. The various phases associated therein were identified by X-ray diffraction (XRD). From field emission scanning electron microscopy (FESEM) study, the formations of nonporous ultrafine particles have been confirmed. About 5 to 10% of the needle like crystals in the ‘as synthesized, condition were transformed to pyramidal structure and most of the crystals are found to have plate like hexagonal structures with increase in heat treatment temperatures. Activation energies and Avrami index ‘n’ were obtained using Johnson-Mehl-Avrami (JMA) equation. The reaction in the temperature range of 800 to 1200°C, proceeds as, instantaneous nucleation and three dimensional growth with activation energy of 168.33 kJ/mole. © Indian Institute of Metals 2010 |
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Reaction kinetic studies of strontium hexaferrite nanoparticles synthesized by co-precipitation method |
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Agarwala, R. C. Agarwala, Vijaya |
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