Narrowing of band gap and decrease in dielectric loss in La1-xSrxMnO3 for x = 0.0, 0.1, and 0.2 manganite nanoparticles

Polycrystalline compounds of lanthanum strontium manganite (La1-xSrxMnO3, LSMO) are widely used in electronic storage devices due to their minimal losses and electronic charge transport properties. In this study, we investigated how varying substitutions of Sr2+ for values of x = 0.0, 0.1, and 0.2 a...

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Main Authors: Akhtar Ali, Wiqar H. Shah, Zakir Ullah, Shaheryar Malik, Muhammad Rauf, Sameh Askar, Naveed Imran, Hijaz Ahmad
Format: Article
Language:English
Published: Frontiers Media S.A. 2024-03-01
Series:Frontiers in Materials
Subjects:
Online Access:https://www.frontiersin.org/articles/10.3389/fmats.2024.1369122/full
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author Akhtar Ali
Wiqar H. Shah
Zakir Ullah
Shaheryar Malik
Muhammad Rauf
Sameh Askar
Naveed Imran
Naveed Imran
Hijaz Ahmad
author_facet Akhtar Ali
Wiqar H. Shah
Zakir Ullah
Shaheryar Malik
Muhammad Rauf
Sameh Askar
Naveed Imran
Naveed Imran
Hijaz Ahmad
author_sort Akhtar Ali
collection DOAJ
description Polycrystalline compounds of lanthanum strontium manganite (La1-xSrxMnO3, LSMO) are widely used in electronic storage devices due to their minimal losses and electronic charge transport properties. In this study, we investigated how varying substitutions of Sr2+ for values of x = 0.0, 0.1, and 0.2 affected the tuning of the optical band gap and dielectric losses in La1-xSrxMnO3 nanoparticles. Synthesized samples were structurally analyzed via X-ray diffraction. A rhombohedral R3¯c crystal structure was confirmed for all prepared samples; crystallite size ranging from 15 nm to 20 nm was estimated along with other lattice parameters. Polygonal or hexagonal-like morphology was revealed by field emission scanning electron microscopy, with a moderate size distribution of nanoparticles affected by thinner grain boundaries in doped LSMO. Energy dispersive spectroscopy was employed to confirm the elemental composition of each compound, and the infrared spectrum indicated bonding in the fingerprint region It was observed that there was a significant reduction in the optical band gap, which was measured using ultraviolet spectrometer absorption data. The band gap decreased from 4.34 eV to 4.11 eV. This reduction was found to be related to the difference in refractive index, which was calculated using both Moss and Herve–Vandamme relations. In parallel, frequency-dependent dielectric analysis revealed that frequency was proportional to the increase in Sr content, inversely affecting dielectric loss. Moreover, the AC conductivity of the prepared samples increased with the rise in Sr content, as described by Johnscher’s universal power law in the region of high frequency.
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spelling doaj.art-3f7a50069dbf4015a0508018aada921c2024-03-26T04:55:48ZengFrontiers Media S.A.Frontiers in Materials2296-80162024-03-011110.3389/fmats.2024.13691221369122Narrowing of band gap and decrease in dielectric loss in La1-xSrxMnO3 for x = 0.0, 0.1, and 0.2 manganite nanoparticlesAkhtar Ali0Wiqar H. Shah1Zakir Ullah2Shaheryar Malik3Muhammad Rauf4Sameh Askar5Naveed Imran6Naveed Imran7Hijaz Ahmad8Department of Physics, Faculty of Sciences, International Islamic University, Islamabad, PakistanDepartment of Physics, Faculty of Sciences, International Islamic University, Islamabad, PakistanDepartment of Physics, Faculty of Sciences, International Islamic University, Islamabad, PakistanDepartment of Physics, Faculty of Sciences, International Islamic University, Islamabad, PakistanDepartment of Physics, Faculty of Sciences, International Islamic University, Islamabad, PakistanDepartment of Statistics and Operations Research, College of Science, King Saud University, Riyadh, Saudi ArabiaHITEC Colleges, HIT Taxila Cantt, Rawlpindi, PakistanInstitute of Space Technology, Islamabad, PakistanSection of Mathematics, International Telematic University Uninettuno, Corso Vittorio Emanuele II, Roma, ItalyPolycrystalline compounds of lanthanum strontium manganite (La1-xSrxMnO3, LSMO) are widely used in electronic storage devices due to their minimal losses and electronic charge transport properties. In this study, we investigated how varying substitutions of Sr2+ for values of x = 0.0, 0.1, and 0.2 affected the tuning of the optical band gap and dielectric losses in La1-xSrxMnO3 nanoparticles. Synthesized samples were structurally analyzed via X-ray diffraction. A rhombohedral R3¯c crystal structure was confirmed for all prepared samples; crystallite size ranging from 15 nm to 20 nm was estimated along with other lattice parameters. Polygonal or hexagonal-like morphology was revealed by field emission scanning electron microscopy, with a moderate size distribution of nanoparticles affected by thinner grain boundaries in doped LSMO. Energy dispersive spectroscopy was employed to confirm the elemental composition of each compound, and the infrared spectrum indicated bonding in the fingerprint region It was observed that there was a significant reduction in the optical band gap, which was measured using ultraviolet spectrometer absorption data. The band gap decreased from 4.34 eV to 4.11 eV. This reduction was found to be related to the difference in refractive index, which was calculated using both Moss and Herve–Vandamme relations. In parallel, frequency-dependent dielectric analysis revealed that frequency was proportional to the increase in Sr content, inversely affecting dielectric loss. Moreover, the AC conductivity of the prepared samples increased with the rise in Sr content, as described by Johnscher’s universal power law in the region of high frequency.https://www.frontiersin.org/articles/10.3389/fmats.2024.1369122/fullLSMO nanoparticlesco-precipitationoptical band gapdielectric constantdielectric lossac conductivity
spellingShingle Akhtar Ali
Wiqar H. Shah
Zakir Ullah
Shaheryar Malik
Muhammad Rauf
Sameh Askar
Naveed Imran
Naveed Imran
Hijaz Ahmad
Narrowing of band gap and decrease in dielectric loss in La1-xSrxMnO3 for x = 0.0, 0.1, and 0.2 manganite nanoparticles
Frontiers in Materials
LSMO nanoparticles
co-precipitation
optical band gap
dielectric constant
dielectric loss
ac conductivity
title Narrowing of band gap and decrease in dielectric loss in La1-xSrxMnO3 for x = 0.0, 0.1, and 0.2 manganite nanoparticles
title_full Narrowing of band gap and decrease in dielectric loss in La1-xSrxMnO3 for x = 0.0, 0.1, and 0.2 manganite nanoparticles
title_fullStr Narrowing of band gap and decrease in dielectric loss in La1-xSrxMnO3 for x = 0.0, 0.1, and 0.2 manganite nanoparticles
title_full_unstemmed Narrowing of band gap and decrease in dielectric loss in La1-xSrxMnO3 for x = 0.0, 0.1, and 0.2 manganite nanoparticles
title_short Narrowing of band gap and decrease in dielectric loss in La1-xSrxMnO3 for x = 0.0, 0.1, and 0.2 manganite nanoparticles
title_sort narrowing of band gap and decrease in dielectric loss in la1 xsrxmno3 for x 0 0 0 1 and 0 2 manganite nanoparticles
topic LSMO nanoparticles
co-precipitation
optical band gap
dielectric constant
dielectric loss
ac conductivity
url https://www.frontiersin.org/articles/10.3389/fmats.2024.1369122/full
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