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27 results on '"Srinatha, N."'

14. Investigation of the synergistic effects of gamma irradiation and (Sm3+, Cu2+) co-doping on the spectroscopic and radiation shielding properties of sodium-zinc-borate glasses.

Author

Madhu, A., Al-Dossari, M., Kagola, Upendra Kumar, Suriyamurthy, N., and Srinatha, N.

Abstract

Radiation-shielding glasses are essential for protecting individuals from the harmful effects of ionising radiation in various industries and medical contexts. Their use is vital for ensuring workplace safety and significantly reducing the risk of long-term health complications resulting from radiation exposure to the eyes. Motivated by this, the (Sm3+, Cu2+) co-doped sodium-zinc-borate glasses were prepared using the melt-quench method. These glasses were then exposed to different doses of gamma radiation, and detailed experimental studies were conducted. Physical parameters such as density, along with other characteristics, were calculated. Detailed analysis of the structural, optical, luminescence, and decay properties was also performed. Computational techniques for Mo-42 and Co-60 were utilised to evaluate the radiation shielding performance of the samples. It was observed that samples with a higher concentration of samarium exhibited better shielding behaviour. The band gap values decreased due to the effects of radiation. Additionally, the variation in density with the radiation dose provided a clear indication of non-bridging oxygen formation due to radiation-induced defects. Energy transfer from samarium to copper ions in the glass was observed at 290 and 402 nm excitations. Colour-correlated diagrams, decay analysis, and colour purity analysis were carried out to understand the dependence of samarium and copper ions in the matrix. The computational evaluation demonstrated that higher concentrations of samarium resulted in better shielding behaviour, and at energies lower than 0.1 MeV, the shielding ability was evident. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Effect of aliovalent substitution in the band structure engineered Ca2+-doped LaFeO3 nanoparticles for visible light-induced photocatalytic studies

Author

Srinatha, N., primary, Satyanarayana Reddy, S., additional, Al-Dossari, M., additional, Gurushantha, K., additional, Gawaad, N.S.Abd EL., additional, Manjunatha, S.O., additional, Rudresh Kumar, K.J., additional, Suresh Kumar, M.R., additional, Tangod, Vadiraj.B., additional, and Madhu, A., additional

Published
2023
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23. The effect of co-dopants (Cu3+, Sm3+-ions) on the optical properties of Sodium-Zinc-Borate glasses

Author

S. Hemalatha, M. Nagaraja, Madhu A., Vinayak Pattar K, K. Suresh, and Srinatha N

Abstract

In this article, we describe the synthesis and optical characteristics of (Cu2+, Sm3+-ions) doped sodium zinc borate glasses made using the conventional melt quenching technique. The produced glasses were investigated using XRD, UV-Visible-NIR, and Photoluminescence spectroscopy. XRD analysis reveals the amorphous nature of produced glass samples. The presence of both Cu2+ and Sm3+ ions may be seen in UV-Visible-NIR absorption spectra in the 200-2000 nm range. Refractive index, density, and energy band gaps were all examined as physical and optical variables.In addition, photoluminescence emission spectra for two excitation wavelengths, 290 nm and 400 nm, were obtained to confirm Cu2+ and Sm3+-ions-induced photoluminescence in sodium zinc borate glasses, respectively. When using a 290 nm excitation, the spectra exhibited one wide emission peak about 460 nm, however when using a 400 nm excitation, the spectra revealed three separate peaks in the visible region.The spectral properties of all of the samples were identical. The drop in PL intensity with Sm3+ concentration might be attributed to energy transfer between copper and samarium ions with 400 nm excitation. Surprisingly, the glass sample with 1 mol% Sm3+ exhibits the highest visible PL intensity / emission. The investigation’s findings show that the produced samples are viable candidates for photonic and LED applications.

Published
2022
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26. Effect of immersion liquids on physical properties of Pr3+-ions doped lithium zinc borate glasses

Author

Uthayakumar, T, Yaduvanshi, Namrata, Madhu, A, and Srinatha, N

Abstract

Our research focused on the creation of lithium zinc borate glasses that were doped with Pr3+ions. Specifically, our study focused on the effects of substituting lithium with Pr2O3. Our x-ray diffractometer analysis indicated that the glasses were amorphous, which was as expected. We have also evaluated the impact of adding Pr2O3using toluene and xylene immersion liquids, and we found that these liquids had unique effects on the glass properties. Furthermore, we examined density changes using the Archimedes principle and estimated physical parameters. We carefully analysed the variations in NBO that were caused by Pr2O3, and our results provide valuable insights into the structural behaviour of these glasses.

Published
2024
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27. New fuel governed combustion synthesis and improved luminescence in nanocrystalline Cr3+doped ZnAl2O4particles

Author

Srinatha, N., Satyanarayana Reddy, S., Suriyamurthy, N., Rudresh Kumar, K.J., Suresh Kumar, M.R., Madhu, A., and Angadi, Basavaraj

Abstract

•Nanocrystalline, single phased Cr3+doped ZnAl2O4prepared via SCS method using Leucine (new fuel).•The interaction of Cr3+and ZnAl2O4host matrix, and effect Cr3+on structural, optical, and luminescence properties are investigated.•Increases in Cr3+concentration result in PL emission enhancement up to x = 0.07.•Racah parameters, crystal field parameters, and local site symmetry of Cr3+ion are estimated.•The value of Dq/B was 3.02, confirms the occupancy of Cr3+ions in a strong crystal field.

Published
2022
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