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Low temperature isothermal reduction behaviour of hydrothermally precipitated CuFe2 O4/MgFe2O4 core/shell nanocrystallites
A hydrothermal precipitation method has been used to coat copper ferrite nanoparticles with magnesium ferrite nanoparticles to form core/shell magnetic structures. The final precipitate was dried at 343 K for 24 h, then calcined at 900°C for 2 h to give the CuFe 2 O 4 /MgFe 2 O 4 core/shell structur...
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| Published in: | Materials technology (New York, N.Y.) N.Y.), 2008-12, Vol.23 (4), p.224-230 |
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| Language: | English |
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| container_end_page | 230 |
| container_issue | 4 |
| container_start_page | 224 |
| container_title | Materials technology (New York, N.Y.) |
| container_volume | 23 |
| creator | Bahgat, M. Khedr, M. H. El Rouby, W. M. A. |
| description | A hydrothermal precipitation method has been used to coat copper ferrite nanoparticles with magnesium ferrite nanoparticles to form core/shell magnetic structures. The final precipitate was dried at 343 K for 24 h, then calcined at 900°C for 2 h to give the CuFe
2
O
4
/MgFe
2
O
4
core/shell structure. The fired powder was pressed to form pellets and sintered at 500°C for 2 h. CuFe
2
O
4
/ MgFe
2
O
4
compacts were isothermally reduced in hydrogen at 400-700°C. The microstructure of partially and completely reduced samples was studied and the activation energy for reduction calculated on the basis of X-ray diffraction studies. The activation energy of the initial stage was found to be 9˙2 kJ mol
−1
, and for the final stage 23 kJ mol
−1
. Reaction kinetics calculations suggest that the reaction is rate controlled by gaseous diffusion in the initial stages, and by combined gaseous diffusion and interfacial chemical reaction mechanisms in the later stages. |
| doi_str_mv | 10.1179/175355508X330834 |
| format | article |
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2
O
4
/MgFe
2
O
4
core/shell structure. The fired powder was pressed to form pellets and sintered at 500°C for 2 h. CuFe
2
O
4
/ MgFe
2
O
4
compacts were isothermally reduced in hydrogen at 400-700°C. The microstructure of partially and completely reduced samples was studied and the activation energy for reduction calculated on the basis of X-ray diffraction studies. The activation energy of the initial stage was found to be 9˙2 kJ mol
−1
, and for the final stage 23 kJ mol
−1
. Reaction kinetics calculations suggest that the reaction is rate controlled by gaseous diffusion in the initial stages, and by combined gaseous diffusion and interfacial chemical reaction mechanisms in the later stages.</description><identifier>ISSN: 1066-7857</identifier><identifier>EISSN: 1753-5557</identifier><identifier>DOI: 10.1179/175355508X330834</identifier><language>eng</language><publisher>Taylor & Francis</publisher><subject>CORE/SHELL MAGNETIC POWDERS ; KINETICS ; MAGNETIC PROPERTIES ; MECHANISMS ; NANOPARTICLES ; REDUCTION</subject><ispartof>Materials technology (New York, N.Y.), 2008-12, Vol.23 (4), p.224-230</ispartof><rights>2008 Maney Publishing 2008</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Bahgat, M.</creatorcontrib><creatorcontrib>Khedr, M. H.</creatorcontrib><creatorcontrib>El Rouby, W. M. A.</creatorcontrib><title>Low temperature isothermal reduction behaviour of hydrothermally precipitated CuFe2 O4/MgFe2O4 core/shell nanocrystallites</title><title>Materials technology (New York, N.Y.)</title><description>A hydrothermal precipitation method has been used to coat copper ferrite nanoparticles with magnesium ferrite nanoparticles to form core/shell magnetic structures. The final precipitate was dried at 343 K for 24 h, then calcined at 900°C for 2 h to give the CuFe
2
O
4
/MgFe
2
O
4
core/shell structure. The fired powder was pressed to form pellets and sintered at 500°C for 2 h. CuFe
2
O
4
/ MgFe
2
O
4
compacts were isothermally reduced in hydrogen at 400-700°C. The microstructure of partially and completely reduced samples was studied and the activation energy for reduction calculated on the basis of X-ray diffraction studies. The activation energy of the initial stage was found to be 9˙2 kJ mol
−1
, and for the final stage 23 kJ mol
−1
. Reaction kinetics calculations suggest that the reaction is rate controlled by gaseous diffusion in the initial stages, and by combined gaseous diffusion and interfacial chemical reaction mechanisms in the later stages.</description><subject>CORE/SHELL MAGNETIC POWDERS</subject><subject>KINETICS</subject><subject>MAGNETIC PROPERTIES</subject><subject>MECHANISMS</subject><subject>NANOPARTICLES</subject><subject>REDUCTION</subject><issn>1066-7857</issn><issn>1753-5557</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><sourceid/><recordid>eNqljz9PwzAUxC0EEuXPzvi-QIhdx3UQY0XFQNWFgS1ynRdi5NrRs0MVPj2pBAsr0_10ujvpGLsT_F4I_VAKraRSitdvUvJaVmdscbKK2dPnM_PVqtC10pfsKqUPzoUWolqwr5d4hIyHAcnkkRBcirlHOhgPhO1os4sB9tibTxdHgthBP7X0m_ETDITWDS6bjC2sxw0uYVeV2_cZdhXYSFimHr2HYEK0NKU811zGdMMuOuMT3v7oNXvcPL2unwsXujiPHyP5tslm8pE6MsG61EjBm9Pd5u9d-b_2N-4JZA4</recordid><startdate>20081201</startdate><enddate>20081201</enddate><creator>Bahgat, M.</creator><creator>Khedr, M. H.</creator><creator>El Rouby, W. M. A.</creator><general>Taylor & Francis</general><scope/></search><sort><creationdate>20081201</creationdate><title>Low temperature isothermal reduction behaviour of hydrothermally precipitated CuFe2 O4/MgFe2O4 core/shell nanocrystallites</title><author>Bahgat, M. ; Khedr, M. H. ; El Rouby, W. M. A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-informaworld_taylorfrancis_310_1179_175355508X3308343</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>CORE/SHELL MAGNETIC POWDERS</topic><topic>KINETICS</topic><topic>MAGNETIC PROPERTIES</topic><topic>MECHANISMS</topic><topic>NANOPARTICLES</topic><topic>REDUCTION</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bahgat, M.</creatorcontrib><creatorcontrib>Khedr, M. H.</creatorcontrib><creatorcontrib>El Rouby, W. M. A.</creatorcontrib><jtitle>Materials technology (New York, N.Y.)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bahgat, M.</au><au>Khedr, M. H.</au><au>El Rouby, W. M. A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Low temperature isothermal reduction behaviour of hydrothermally precipitated CuFe2 O4/MgFe2O4 core/shell nanocrystallites</atitle><jtitle>Materials technology (New York, N.Y.)</jtitle><date>2008-12-01</date><risdate>2008</risdate><volume>23</volume><issue>4</issue><spage>224</spage><epage>230</epage><pages>224-230</pages><issn>1066-7857</issn><eissn>1753-5557</eissn><abstract>A hydrothermal precipitation method has been used to coat copper ferrite nanoparticles with magnesium ferrite nanoparticles to form core/shell magnetic structures. The final precipitate was dried at 343 K for 24 h, then calcined at 900°C for 2 h to give the CuFe
2
O
4
/MgFe
2
O
4
core/shell structure. The fired powder was pressed to form pellets and sintered at 500°C for 2 h. CuFe
2
O
4
/ MgFe
2
O
4
compacts were isothermally reduced in hydrogen at 400-700°C. The microstructure of partially and completely reduced samples was studied and the activation energy for reduction calculated on the basis of X-ray diffraction studies. The activation energy of the initial stage was found to be 9˙2 kJ mol
−1
, and for the final stage 23 kJ mol
−1
. Reaction kinetics calculations suggest that the reaction is rate controlled by gaseous diffusion in the initial stages, and by combined gaseous diffusion and interfacial chemical reaction mechanisms in the later stages.</abstract><pub>Taylor & Francis</pub><doi>10.1179/175355508X330834</doi></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1066-7857 |
| ispartof | Materials technology (New York, N.Y.), 2008-12, Vol.23 (4), p.224-230 |
| issn | 1066-7857 1753-5557 |
| language | eng |
| recordid | cdi_informaworld_taylorfrancis_310_1179_175355508X330834 |
| source | Taylor and Francis Science and Technology Collection |
| subjects | CORE/SHELL MAGNETIC POWDERS KINETICS MAGNETIC PROPERTIES MECHANISMS NANOPARTICLES REDUCTION |
| title | Low temperature isothermal reduction behaviour of hydrothermally precipitated CuFe2 O4/MgFe2O4 core/shell nanocrystallites |
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