Specific heat of pure and doped LiRbSO4 crystals

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

doi:10.1016/0040-6031(92)85289-8

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…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 . Tuszynski et al [ 13 ] and Melo et al [ 4 ] reported an increase in

as a function of an applied uniaxial stress.…”

Section: Numerical Results and Discussionsupporting

confidence: 85%

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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“…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 . Tuszynski et al [ 13 ] and Melo et al [ 4 ] reported an increase in

as a function of an applied uniaxial stress.…”

Section: Numerical Results and Discussionsupporting

confidence: 85%

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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“…The present study is also motivated by the work of E1-Khatib et al [5] and Kassem et al [6] on LiKSO4 and LiRbSO4 crystals respectively. El-Khatib et al…”

Section: John Wiley and Sons Limited Chichester Akad~miai Kiad6 Budamentioning

confidence: 89%

Stoichiometric ratio and doping effects on the thermal properties of sodium potassium sulphate crystals

Abboudy

Hamed

Kassem

et al. 1993

Journal of Thermal Analysis

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The influence of stoichiometric ratio on the phase transition of sodium potassium sulphate (NaxKl-x)2SO4 crystals is investigated in the temperature range 300-500 K. The stoichiometric ratio x is chosen to be x = 0.2, 0.3, 0.4, 0.8 and 0.9. The study has been carded out by using differential scanning calorimetry, DSC technique. The value of the specific heat, Cp, at the transition temperature, To, increases as x is increased up to x = 0.4 and then decreases for higher values of x. The change in the specific heat, ACp, is following a relation of the form AC~ o~(T-Tc/Tc) "~ with o~ = 0.12 which is in a fair agreement with the 3d Ising model. Insertion of Cu ions into the lattice of (NaxKl-x)2SO4 crystals leads to a multiple peak in the temperature dependence of Cr,. The results are discussed from thermodynamical point of view.

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Gamma-radiation-induced change in the activation energy of TL traps in LiRbSO4: Tl

Kassem

El-Kolaly

Al-Houty

1994

Applied Radiation and Isotopes

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Specific heat of pure and doped LiRbSO4 crystals

Cited by 4 publications

References 15 publications

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

Stoichiometric ratio and doping effects on the thermal properties of sodium potassium sulphate crystals

Gamma-radiation-induced change in the activation energy of TL traps in LiRbSO4: Tl

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