On the structural, refractive index and energy bandgap based optical properties of Lithium ferrite nanoparticles dispersed in silica matrix
Lithium ferrite nanoparticles dispersed in silica matrix [Li0.5Fe2.5O4]1–x[SiO2]x (x = 0, 50–90%) have been synthesized using ultrasonic assisted sol–gel method. Agglomeration due to higher surface energy and interparticle interactions is reduced due to dispersion in silica; which modifies the nanop...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | Applied Surface Science Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666523922000927 |
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| author | N.P. Barde V.R. Rathod P.S. Solanki N.A. Shah P.P. Bardapurkar |
| author_facet | N.P. Barde V.R. Rathod P.S. Solanki N.A. Shah P.P. Bardapurkar |
| author_sort | N.P. Barde |
| collection | DOAJ |
| description | Lithium ferrite nanoparticles dispersed in silica matrix [Li0.5Fe2.5O4]1–x[SiO2]x (x = 0, 50–90%) have been synthesized using ultrasonic assisted sol–gel method. Agglomeration due to higher surface energy and interparticle interactions is reduced due to dispersion in silica; which modifies the nanoparticle surface and revamp properties of the system. X–ray diffractometer (XRD) measurement reveals simple cubic spinel structure without any impurities. Dynamic magnetic field susceptibility studies show that reversible nature of magnetic domain walls dominates over the irreversible nature. Energy band gap (Eg) determined from UV–Visible (UV–Vis) spectroscopy shows an escalation (1.47 eV to 1.59 eV) for change in silica from 0% to 90%. An empirical formula for refractive index as μ = A(silica content)2+B(silica content)+C has been derived using theoretical fit. With increase in silica content, the refractive index, optical dielectric constant, dielectric susceptibility and oxygen packing density show decrements from 3.82 to 1.77, 8.1204 to 7.6825, 0.6465 to 0.6117 and 70.3157 to 60.974, respectively. The reflectivity, absorption coefficient, molar refractive index, molar electronic polarizability, reflection loss, polaron radius and optical basicity also show reduction. This is attributed to change in density and interparticle interaction due to change in silica content. Dielectric polarizability, transmission coefficient and metallization criterion show increment from 14.85 Å3 to 39.29 Å3, 0.5968 to 0.6086 and 0.2698 to 0.2808; respectively. Observed effects have been ascribed to higher strain, reduction in reflection loss and more non-metallic nature of the samples. Swift changes in parameters indicate their fine tuning through optimum magnitude of silica. |
| first_indexed | 2024-04-12T12:21:04Z |
| format | Article |
| id | doaj.art-8323b5ba967c495dac583a58783bfedd |
| institution | Directory Open Access Journal |
| issn | 2666-5239 |
| language | English |
| last_indexed | 2024-04-12T12:21:04Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Applied Surface Science Advances |
| spelling | doaj.art-8323b5ba967c495dac583a58783bfedd2022-12-22T03:33:18ZengElsevierApplied Surface Science Advances2666-52392022-10-0111100302On the structural, refractive index and energy bandgap based optical properties of Lithium ferrite nanoparticles dispersed in silica matrixN.P. Barde0V.R. Rathod1P.S. Solanki2N.A. Shah3P.P. Bardapurkar4Badrinarayan Barwale Mahavidyalaya, Jalna, Maharashtra 431203, IndiaH. & H. B. Kotak Institute of Science, Rajkot 360001, IndiaDepartment of Physics, Saurashtra University, Rajkot 360005, IndiaDepartment of Physics, Saurashtra University, Rajkot 360005, IndiaS.N. Arts, D.J. Malpani Commerce & B.N. Sarda Science College, Sangamner, Maharashtra 422605, India; Corresponding author.Lithium ferrite nanoparticles dispersed in silica matrix [Li0.5Fe2.5O4]1–x[SiO2]x (x = 0, 50–90%) have been synthesized using ultrasonic assisted sol–gel method. Agglomeration due to higher surface energy and interparticle interactions is reduced due to dispersion in silica; which modifies the nanoparticle surface and revamp properties of the system. X–ray diffractometer (XRD) measurement reveals simple cubic spinel structure without any impurities. Dynamic magnetic field susceptibility studies show that reversible nature of magnetic domain walls dominates over the irreversible nature. Energy band gap (Eg) determined from UV–Visible (UV–Vis) spectroscopy shows an escalation (1.47 eV to 1.59 eV) for change in silica from 0% to 90%. An empirical formula for refractive index as μ = A(silica content)2+B(silica content)+C has been derived using theoretical fit. With increase in silica content, the refractive index, optical dielectric constant, dielectric susceptibility and oxygen packing density show decrements from 3.82 to 1.77, 8.1204 to 7.6825, 0.6465 to 0.6117 and 70.3157 to 60.974, respectively. The reflectivity, absorption coefficient, molar refractive index, molar electronic polarizability, reflection loss, polaron radius and optical basicity also show reduction. This is attributed to change in density and interparticle interaction due to change in silica content. Dielectric polarizability, transmission coefficient and metallization criterion show increment from 14.85 Å3 to 39.29 Å3, 0.5968 to 0.6086 and 0.2698 to 0.2808; respectively. Observed effects have been ascribed to higher strain, reduction in reflection loss and more non-metallic nature of the samples. Swift changes in parameters indicate their fine tuning through optimum magnitude of silica.http://www.sciencedirect.com/science/article/pii/S2666523922000927Lithium ferriteSilica matrixRefractive indexPolarizabilityOptical basicity |
| spellingShingle | N.P. Barde V.R. Rathod P.S. Solanki N.A. Shah P.P. Bardapurkar On the structural, refractive index and energy bandgap based optical properties of Lithium ferrite nanoparticles dispersed in silica matrix Applied Surface Science Advances Lithium ferrite Silica matrix Refractive index Polarizability Optical basicity |
| title | On the structural, refractive index and energy bandgap based optical properties of Lithium ferrite nanoparticles dispersed in silica matrix |
| title_full | On the structural, refractive index and energy bandgap based optical properties of Lithium ferrite nanoparticles dispersed in silica matrix |
| title_fullStr | On the structural, refractive index and energy bandgap based optical properties of Lithium ferrite nanoparticles dispersed in silica matrix |
| title_full_unstemmed | On the structural, refractive index and energy bandgap based optical properties of Lithium ferrite nanoparticles dispersed in silica matrix |
| title_short | On the structural, refractive index and energy bandgap based optical properties of Lithium ferrite nanoparticles dispersed in silica matrix |
| title_sort | on the structural refractive index and energy bandgap based optical properties of lithium ferrite nanoparticles dispersed in silica matrix |
| topic | Lithium ferrite Silica matrix Refractive index Polarizability Optical basicity |
| url | http://www.sciencedirect.com/science/article/pii/S2666523922000927 |
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