Effect of nickel doping on magnetic and dielectric properties of orthorhombic calcium ferrite nanoparticles
Nickel (10∼50 mol%) doped calcium ferrite nanoparticles (NPs) are synthesized by the solution combustion method using lemon juice extract as a reducing agent, followed by calcination at 500°C. The calcined samples are characterized with different techniques. The Bragg reflections of Nickel doping co...
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Elsevier
2024-03-01
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| Series: | Green Energy and Resources |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949720524000134 |
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| author | R. UmashankaraRaja Y.S. Vidya H.C. Manjunatha M. Priyanka R. Munirathnam K.M. Rajashekara S. Manjunatha E. Krishnakanth |
| author_facet | R. UmashankaraRaja Y.S. Vidya H.C. Manjunatha M. Priyanka R. Munirathnam K.M. Rajashekara S. Manjunatha E. Krishnakanth |
| author_sort | R. UmashankaraRaja |
| collection | DOAJ |
| description | Nickel (10∼50 mol%) doped calcium ferrite nanoparticles (NPs) are synthesized by the solution combustion method using lemon juice extract as a reducing agent, followed by calcination at 500°C. The calcined samples are characterized with different techniques. The Bragg reflections of Nickel doping confirm the formation of a single orthorhombic calcium ferrite phase. The crystallite size is estimated using both Scherrer's and the W-H plot method. The surface morphology consists of irregular size and shaped agglomerated NPs along with pores and voids. A blueshift and a broad absorption spectrum is observed with an increase in the direct energy band gap. The direct energy band gap estimated from Wood and Tauc's relationship was found to be 2.91∼2.97 eV with an increase in dopant concentration. The magnetic analysis provided values for saturation magnetization (Ms), remanence (Mr), and coercivity (Hc), while dielectric studies demonstrated a dielectric constant of 2.81, 2.14, and 1.67 with increasing dopant concentration. The variation of dielectric properties of the sample as a function of frequency in the range 0.1∼20 MHz has been studied at room temperature. The dielectric properties of CaFe2O4: Ni (1∼9 mol%) NPs clearly indicate that there is a more pronounced dispersion at lower frequencies, gradually reaching saturation as the frequency increases. The dielectric loss was found to decrease from 4.62, 3.22, and 2.32 with an increase in Ni2+ substitution (10, 30, and 50 mol%) respectively. These results indicate the suitability of these samples for applications in memory devices and high-frequency applications. |
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| language | English |
| last_indexed | 2024-04-24T11:20:28Z |
| publishDate | 2024-03-01 |
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| series | Green Energy and Resources |
| spelling | doaj.art-ab2ea47c0ed14ff69ba199d9a852d5e52024-04-11T04:42:15ZengElsevierGreen Energy and Resources2949-72052024-03-0121100059Effect of nickel doping on magnetic and dielectric properties of orthorhombic calcium ferrite nanoparticlesR. UmashankaraRaja0Y.S. Vidya1H.C. Manjunatha2M. Priyanka3R. Munirathnam4K.M. Rajashekara5S. Manjunatha6E. Krishnakanth7St. Philomena's College, Attibele, Anekal Taluk, Bengaluru, 562107, Karnataka, India; Department of Physics, S.J.C Institute of Technology, Chickaballapur, 562101, Karnataka, IndiaDepartment of Physics, Lal Bahadur Shastri Government First Grade College, RT Nagar, Bangalore, 560032, Karnataka, India; Corresponding author.Department of Physics, Government First Grade College, Devanahalli, 562110 Karnataka, India; Corresponding author.Material Research Centre, School of Engineering, Presidency University, Bangalore, 560064, IndiaDepartment of Physics, Government College for Women, Kolar, 563101 Karnataka, IndiaDepartment of Physics, S.J.C Institute of Technology, Chickaballapur, 562101, Karnataka, IndiaDepartment of Chemistry, B.M.S. College of Engineering, Bengaluru, 560019, Karnataka, IndiaMaterial Research Centre, School of Engineering, Presidency University, Bangalore, 560064, IndiaNickel (10∼50 mol%) doped calcium ferrite nanoparticles (NPs) are synthesized by the solution combustion method using lemon juice extract as a reducing agent, followed by calcination at 500°C. The calcined samples are characterized with different techniques. The Bragg reflections of Nickel doping confirm the formation of a single orthorhombic calcium ferrite phase. The crystallite size is estimated using both Scherrer's and the W-H plot method. The surface morphology consists of irregular size and shaped agglomerated NPs along with pores and voids. A blueshift and a broad absorption spectrum is observed with an increase in the direct energy band gap. The direct energy band gap estimated from Wood and Tauc's relationship was found to be 2.91∼2.97 eV with an increase in dopant concentration. The magnetic analysis provided values for saturation magnetization (Ms), remanence (Mr), and coercivity (Hc), while dielectric studies demonstrated a dielectric constant of 2.81, 2.14, and 1.67 with increasing dopant concentration. The variation of dielectric properties of the sample as a function of frequency in the range 0.1∼20 MHz has been studied at room temperature. The dielectric properties of CaFe2O4: Ni (1∼9 mol%) NPs clearly indicate that there is a more pronounced dispersion at lower frequencies, gradually reaching saturation as the frequency increases. The dielectric loss was found to decrease from 4.62, 3.22, and 2.32 with an increase in Ni2+ substitution (10, 30, and 50 mol%) respectively. These results indicate the suitability of these samples for applications in memory devices and high-frequency applications.http://www.sciencedirect.com/science/article/pii/S2949720524000134Calcium ferriteNickelGreen technologyElectricalMagneticOrthorhombic |
| spellingShingle | R. UmashankaraRaja Y.S. Vidya H.C. Manjunatha M. Priyanka R. Munirathnam K.M. Rajashekara S. Manjunatha E. Krishnakanth Effect of nickel doping on magnetic and dielectric properties of orthorhombic calcium ferrite nanoparticles Green Energy and Resources Calcium ferrite Nickel Green technology Electrical Magnetic Orthorhombic |
| title | Effect of nickel doping on magnetic and dielectric properties of orthorhombic calcium ferrite nanoparticles |
| title_full | Effect of nickel doping on magnetic and dielectric properties of orthorhombic calcium ferrite nanoparticles |
| title_fullStr | Effect of nickel doping on magnetic and dielectric properties of orthorhombic calcium ferrite nanoparticles |
| title_full_unstemmed | Effect of nickel doping on magnetic and dielectric properties of orthorhombic calcium ferrite nanoparticles |
| title_short | Effect of nickel doping on magnetic and dielectric properties of orthorhombic calcium ferrite nanoparticles |
| title_sort | effect of nickel doping on magnetic and dielectric properties of orthorhombic calcium ferrite nanoparticles |
| topic | Calcium ferrite Nickel Green technology Electrical Magnetic Orthorhombic |
| url | http://www.sciencedirect.com/science/article/pii/S2949720524000134 |
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