Effect of Ca2+ doping and annealing temperature on the structure, morphology and magnetic behavior of CaxCo1-xFe2O4/SiO2 nanocomposites
Co-doped ferrites are promising functional materials for many practical applications and their physical properties can be tailored by changing their composition. This study assesses the structure, morphology and magnetic properties of CaxCo1-xFe2O4/SiO2 (x = 0.0–0.5) nanocomposites (NCs) obtained by...
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Elsevier
2024-01-01
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| Series: | Results in Physics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379723010999 |
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| author | Thomas Dippong Ioan Petean Iosif Grigore Deac Erika Andrea Levei Oana Cadar |
| author_facet | Thomas Dippong Ioan Petean Iosif Grigore Deac Erika Andrea Levei Oana Cadar |
| author_sort | Thomas Dippong |
| collection | DOAJ |
| description | Co-doped ferrites are promising functional materials for many practical applications and their physical properties can be tailored by changing their composition. This study assesses the structure, morphology and magnetic properties of CaxCo1-xFe2O4/SiO2 (x = 0.0–0.5) nanocomposites (NCs) obtained by sol–gel method and annealed at different temperatures (400, 800 and 1200 °C). The effect of Ca2+ doping on the properties of nano-structured Ca-Co ferrite embedded in the SiO2 matrix was investigated by thermogravimetry and differential thermal analysis, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy, Brunauer-Emmett-Teller surface area, inductively coupled plasma optical emission spectrometry, atomic force microscopy (AFM) and magnetic measurements. The thermal analysis showed the formation of metal succinates up to 200 °C and of ferrite above 280 °C. The presence of poorly crystalline ferrite accompanied by silicates at low annealing temperatures and of highly crystalline ferrite accompanied by SiO2 and Ca silicates at high annealing temperatures was identified by XRD. The increased Ca2+ doping led to a decrease in the structural parameters estimated by XRD and the surface area. The AFM images revealed that the NCs have a crystalline core covered by a layer of amorphous SiO2. The hysteresis loop shape indicated the superparamagnetic-like and ferromagnetic behavior of the obtained NCs. The magnetic properties improved with the increase in annealing temperature and depended on the particle size and dopant content. The NCs with low Ca2+ content annealed at 800 °C still show appreciable hysteresis, but doping with high Ca2+ contents drastically affects the magnetic properties. |
| first_indexed | 2024-03-08T12:52:26Z |
| format | Article |
| id | doaj.art-78d00a6ebdb24f9ab03679daf3473ad2 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-03-08T12:52:26Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-78d00a6ebdb24f9ab03679daf3473ad22024-01-20T04:45:23ZengElsevierResults in Physics2211-37972024-01-0156107306Effect of Ca2+ doping and annealing temperature on the structure, morphology and magnetic behavior of CaxCo1-xFe2O4/SiO2 nanocompositesThomas Dippong0Ioan Petean1Iosif Grigore Deac2Erika Andrea Levei3Oana Cadar4Technical University of Cluj-Napoca, Faculty of Science, 76 Victoriei Street, 430122 Baia Mare, Romania; Corresponding author.Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, 11 Arany Janos Street, 400084 Cluj-Napoca, RomaniaBabes-Bolyai University, Faculty of Physics, 1 Kogalniceanu Street, 400084 Cluj-Napoca, RomaniaINCDO-INOE 2000, Research Institute for Analytical Instrumentation, 67 Donath Street, 400293 Cluj-Napoca, RomaniaINCDO-INOE 2000, Research Institute for Analytical Instrumentation, 67 Donath Street, 400293 Cluj-Napoca, RomaniaCo-doped ferrites are promising functional materials for many practical applications and their physical properties can be tailored by changing their composition. This study assesses the structure, morphology and magnetic properties of CaxCo1-xFe2O4/SiO2 (x = 0.0–0.5) nanocomposites (NCs) obtained by sol–gel method and annealed at different temperatures (400, 800 and 1200 °C). The effect of Ca2+ doping on the properties of nano-structured Ca-Co ferrite embedded in the SiO2 matrix was investigated by thermogravimetry and differential thermal analysis, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy, Brunauer-Emmett-Teller surface area, inductively coupled plasma optical emission spectrometry, atomic force microscopy (AFM) and magnetic measurements. The thermal analysis showed the formation of metal succinates up to 200 °C and of ferrite above 280 °C. The presence of poorly crystalline ferrite accompanied by silicates at low annealing temperatures and of highly crystalline ferrite accompanied by SiO2 and Ca silicates at high annealing temperatures was identified by XRD. The increased Ca2+ doping led to a decrease in the structural parameters estimated by XRD and the surface area. The AFM images revealed that the NCs have a crystalline core covered by a layer of amorphous SiO2. The hysteresis loop shape indicated the superparamagnetic-like and ferromagnetic behavior of the obtained NCs. The magnetic properties improved with the increase in annealing temperature and depended on the particle size and dopant content. The NCs with low Ca2+ content annealed at 800 °C still show appreciable hysteresis, but doping with high Ca2+ contents drastically affects the magnetic properties.http://www.sciencedirect.com/science/article/pii/S2211379723010999Calcium-cobalt ferriteDopingSol–gel methodAnnealing temperatureMagnetic properties |
| spellingShingle | Thomas Dippong Ioan Petean Iosif Grigore Deac Erika Andrea Levei Oana Cadar Effect of Ca2+ doping and annealing temperature on the structure, morphology and magnetic behavior of CaxCo1-xFe2O4/SiO2 nanocomposites Results in Physics Calcium-cobalt ferrite Doping Sol–gel method Annealing temperature Magnetic properties |
| title | Effect of Ca2+ doping and annealing temperature on the structure, morphology and magnetic behavior of CaxCo1-xFe2O4/SiO2 nanocomposites |
| title_full | Effect of Ca2+ doping and annealing temperature on the structure, morphology and magnetic behavior of CaxCo1-xFe2O4/SiO2 nanocomposites |
| title_fullStr | Effect of Ca2+ doping and annealing temperature on the structure, morphology and magnetic behavior of CaxCo1-xFe2O4/SiO2 nanocomposites |
| title_full_unstemmed | Effect of Ca2+ doping and annealing temperature on the structure, morphology and magnetic behavior of CaxCo1-xFe2O4/SiO2 nanocomposites |
| title_short | Effect of Ca2+ doping and annealing temperature on the structure, morphology and magnetic behavior of CaxCo1-xFe2O4/SiO2 nanocomposites |
| title_sort | effect of ca2 doping and annealing temperature on the structure morphology and magnetic behavior of caxco1 xfe2o4 sio2 nanocomposites |
| topic | Calcium-cobalt ferrite Doping Sol–gel method Annealing temperature Magnetic properties |
| url | http://www.sciencedirect.com/science/article/pii/S2211379723010999 |
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