Infrared, Raman, electrical and thermal analysis of lithium sulphate monohydrate single crystals

Najar, Fayaz A.; Vakil, Gowher B.; Want, Basharat

doi:10.1007/s10854-017-7271-1

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…The vibrational bands at 2936, 2866, 1654, 1611, 1448, and 1117 cm -1 are due to the CH2, CH, C=O, NH, N(CH3)2 + e C-N groups, respectively (Zhang et al, 2018;Yang et al, 2020;Afacam et al, 2021). As described in the literature, the main bands of Li2SO4 are exhibited at 3464 and 1609 cm −1 that can be attributed to vibrational modes of water molecules and between 1012-1016 cm −1 ,1110-1116 cm −1 , and 1170-1176 cm −1 that are associated to SO4 -2 anion (Najar et al, 2017;Naik et al, 2020). In the case of ATR-FTIR spectra of PAADDA/Li2SO4 (0.25% w/w) and PAADDA/Li2SO4 (0.5% w/w), it is possible to observe a significative decreasing of the intensity of the NH2 groups compared to spectrum of pristine PAADDA.…”

Section: Attenuated Total Reflectance-fourier Transform Infrared Spec...mentioning

confidence: 56%

Thermal and electrochemical impedance spectroscopy analysis of PAADDA film incorporated with Li2SO4

Caetano,

Melo,

Freitas

et al. 2023

J. Eng. Exact Sci.

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In this paper, poly(acrylamide-co-dialidimethylamonium)-PAADDA films containing lithium sulfate (Li2SO4) were prepared by casting method from aqueous solutions. The obtained films (pristine PAADDA, PAADDA/Li2SO4-0.25% w/w, and PAADDA/Li2SO4-0.5% w/w) were characterized by means of attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), thermogravimetric analysis (TGA), and electrochemical impedance spectroscopy (EIS). ATR-FTIR spectra of PAADDA/Li2SO4 films showed the main bands of PAADDA and suggested a significative intermolecular interaction between the polymer and Li2SO4. TGA curves displayed that the thermal stability of PAADDA film is dependent on the Li2SO4 concentration. The ionic conductivity of the films followed the order: PAADDA/Li2SO4-0.25% w/w < pristine PAADDA <PAADDA/Li2SO4-0.5% w/w.

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Section: Attenuated Total Reflectance-fourier Transform Infrared Spec...mentioning

confidence: 56%

Thermal and electrochemical impedance spectroscopy analysis of PAADDA film incorporated with Li2SO4

Caetano,

Melo,

Freitas

et al. 2023

J. Eng. Exact Sci.

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“…2. In our previous work these crystals were already studied by using single crystal/powder X-ray diffraction (XRD), Energy dispersive X-ray analysis (EDAX), Infrared (IR) spectroscopy, optical (UV-Visible/Photoluminescence) and dielectric spectroscopic analysis measurements [15,27]. Dual-beam Varian Carry 500 spectrophotometer was used to study the optical parameters from absorbance, transmittance and re ectance spectra of pure and doped LSMH crystals.…”

Section: Methodsmentioning

confidence: 99%

“…Lithium sulfate monohydrate (LSMH) belongs to the family of alkali sulfates and is con rmed to be a suitable host material because of its adequate mechanical, thermal and chemical stabilities [14,15]. Due to the wide band gap, high transmittance and desired refractive index of LSMH in the ultra-violet visible region puts forward them as a suitable material for utilization in optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

Effect of rare-earth Eu3+ and Tb3+ ions on the optoelectrical parameters of lithium sulfate monohydrate crystals

et al. 2023

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The effect of rare-earth Eu 3+ and Tb 3+ ions on the optoelectrical parameters of lithium sulfate monohydrate (LSMH) crystals grown by slow evaporation solution growth technique was observed. The information extracted from transmittance and re ectance spectra proved helpful in determining refractive index, extinction coe cient and various other parameters for these crystals. The effect on the volume/surface energy loss functions, optical energy gap, band tail width and tangent loss factor due to doping in these crystals were discussed. The impact of rare-earth ions on dispersion parameters derived from Wemple-DiDomeenico single oscillator model, Cauchy dispersion relation and on optoelectrical parameters derived from Drude theory was also studied. The other different parameters like optical conductivity, electronic polarizability, nonlinear refractive index, optical electronegativity, nonlinear optical susceptibility, optical and chemical hardness also get affected by doping of rare-earth ions. The relation between group and phase velocity in terms of group index in these crystals was also discussed. However, some empirical and semi-empirical rules have been used to calculate the value of the refractive index.

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“…Usually, there is a significant decrease in the luminescent intensity either due to the formation of RE 2 O 3 aggregates which works as quenching sites or due to the RE 3+ ions which tend to locate on a crystal surface, resulting in an undesired RE‐RE interaction. [ 19 ] Presently, research has been carried out on the optical characterization and synthesis of RE‐doped alkali sulfates to improve the luminescence of the rare earth ions by the energy transfer from host material. [ 20 ] In the literature, different alkali sulfates doped with RE ions for the application as phosphors [ 21 ] were used in the powder form.…”

Section: Introductionmentioning

confidence: 99%

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu³⁺ and Tb³⁺ Ion Doping

Najar

Naik

Farooq

et al. 2020

Crystal Research and Technology

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A slow evaporation solution growth technique is used to grow rare earth (Eu3+ and Tb3+) doped lithium sulfate monohydrate (LSMH) single crystals. X‐ray diffraction analysis of these crystals confirms the monoclinic crystal structure with P21 space group. Energy dispersive X‐ray spectroscopy is used to check the incorporation of dopants into the crystal lattice of these LSMH crystals. Dielectric, UV–vis photoluminescence spectroscopy studies are carried out to study the electrical and optical behavior of these crystals. The optical bandgap decreases by doping and the current material follows the direct allowed transition. The dielectric constant and ac conductivity slightly increase with the incorporation of Eu3+ and Tb3+ ions in the crystal matrix. The effect of doping on the functional groups of LSMH crystals is confirmed by Fourier transform infrared spectroscopy. The micro‐Raman spectroscopic technique is carried out on these samples, confirming the stress experienced by the crystal with dopants, and further leading to the degradation of the crystal structure. The photoluminescence emission with a large decay time of the as‐grown crystals is dominated by the 5D0 → 7Fj transitions of Eu3+ and 5D4 → 7Fj transitions of Tb3+ ions, and further provides a possibility of using them as potential optical materials.

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Infrared, Raman, electrical and thermal analysis of lithium sulphate monohydrate single crystals

Cited by 7 publications

References 33 publications

Thermal and electrochemical impedance spectroscopy analysis of PAADDA film incorporated with Li2SO4

Thermal and electrochemical impedance spectroscopy analysis of PAADDA film incorporated with Li2SO4

Effect of rare-earth Eu3+ and Tb3+ ions on the optoelectrical parameters of lithium sulfate monohydrate crystals

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu³⁺ and Tb³⁺ Ion Doping

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Infrared, Raman, electrical and thermal analysis of lithium sulphate monohydrate single crystals

Cited by 7 publications

References 33 publications

Thermal and electrochemical impedance spectroscopy analysis of PAADDA film incorporated with Li2SO4

Thermal and electrochemical impedance spectroscopy analysis of PAADDA film incorporated with Li2SO4

Effect of rare-earth Eu3+ and Tb3+ ions on the optoelectrical parameters of lithium sulfate monohydrate crystals

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu3+ and Tb3+ Ion Doping

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Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu³⁺ and Tb³⁺ Ion Doping