Dielectric dispersion in pure and doped lithium rubidium sulphate

Kassem, M. E.; El-Muraikhi, M.; Al-Houty, L.; Adnane, M.

doi:10.1080/10420159608211531

Cited by 6 publications

(4 citation statements)

References 1 publication

(1 reference statement)

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“…Curve 3 in Figure 5 presents the increase in

in LCS after doping with Rb + ions, in coincidence with the result of Zapart et al [ 23 ]. It must be noted that the

of LiKSO 4 is 708 K [ 33 ], whereas of LiRbSO 4 , it is 477 K [ 34 ]. We would also observe an increase in

and

by doping with Sm 3+ or Dy 3+ ions on the Cs site, as reported by Kassem et al [ 35 ], when doped with the last two ions LiRbSO 4 .…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

Apostolov,

Apostolova,

Wesselinowa

2024

Materials

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Using a microscopic model, the temperature dependence of two phonon modes, ω0 = 32 cm−1 and 72 cm−1, and their damping of the ferroelastic LiCsSO4 compound, are calculated within Green’s function technique. It is observed that the first mode increases whereas the second one decreases with increasing temperature T. This different behavior is explained with different sign of the anharmonic spin–phonon interaction constant. At the ferroelastic phase transition temperature TC, there is a kink in both modes due to the spin–phonon interaction. The phonon damping increases with T, and again shows an anomaly at TC. The contributions of the spin–phonon and phonon–phonon interactions are discussed. TC is reduced by decreasing the nanoparticle size, and can be enhanced by doping with K, Rb and NH4 ions at the Cs site. TC decreases by doping with Na, K or Rb on the Li site. The specific heat Cp also shows a kink at TC. Cp decreases with decreasing nanoparticle size and the peak disappears, whereas Cp increases with increasing K ion doping concentration.

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“…Curve 3 in Figure 5 presents the increase in

in LCS after doping with Rb + ions, in coincidence with the result of Zapart et al [ 23 ]. It must be noted that the

of LiKSO 4 is 708 K [ 33 ], whereas of LiRbSO 4 , it is 477 K [ 34 ]. We would also observe an increase in

and

by doping with Sm 3+ or Dy 3+ ions on the Cs site, as reported by Kassem et al [ 35 ], when doped with the last two ions LiRbSO 4 .…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

Apostolov,

Apostolova,

Wesselinowa

2024

Materials

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“…Thus, it reveals that hoping charge carriers exhibit simultaneously both dielectric and conductivity characteristics. [ 35 ]…”

Section: Resultsmentioning

confidence: 99%

“…Thus, it reveals that hoping charge carriers exhibit simultaneously both dielectric and conductivity characteristics. [35] Figure 9 shows the absorption spectra of pure and doped LSMH crystals in the 200-800 nm range of wavelength. The transparency of the crystal for optical purpose in the considerable wavelength region is an important factor.…”

Section: Dielectric Analysismentioning

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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“…The viable cause for the reduction in transmittance of these grown crystals is attributed to the creation of structural disorder and results in the generation of localized states when doped with Eu 3+ and Tb 3+ ions [28]. It has been revealed that the different types of disorders like structural and compositional defects can be associated with the charge localization presence in materials [29]. The micro-structural character got in uenced because of doping once the structural defects are developed in these crystals.…”

Section: Transmittance Re Ectance and Absorbance Spectramentioning

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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Dielectric dispersion in pure and doped lithium rubidium sulphate

Cited by 6 publications

References 1 publication

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

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

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

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Dielectric dispersion in pure and doped lithium rubidium sulphate

Cited by 6 publications

References 1 publication

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

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

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

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