Study of the phase transition in lithium potassium rubidium sulfate system

Hamed, A. E.; El-Aziz, Y. M. Abd; Madi, N.K.; Kassem, M. E.

doi:10.1016/s0921-4526(98)00369-x

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…The specific heat for the system LiK (1−x) Rb x SO 4 has been studied between 300 and 800 K for small values of x ranging from 0.02 to 0.10 [26,27]. Essential changes in the critical behaviour of C p (T) and a continuous decrease in the thermodynamic parameters have been observed in the region of the high temperature phase transition.…”

Section: Introductionmentioning

confidence: 99%

The double-peak phenomenon of the phase transition of Rb substituting K in LiKSO₄, competition between Rb sub-lattice and smearing the phase transition

Gaffar

Ahmad

Yamada

et al. 2007

J. Phys. D: Appl. Phys.

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The influence of Rb in the triple sulfate LiK(1−x)RbxSO4 (0 ≤ x ≤ 0.2) compound on the structural and thermal properties of the bulk material is discussed. Samples were prepared by fusing the sulfates in stoichiometric ratios in a platinum crucible at 1273 K for 30 min. The x-ray powder diffraction measurements were performed at ambient temperature. The crystal structure parameters were refined by the Rietveld method using the FullProf program. The analysis indicated a single-phase having a hexagonal symmetry with space group P63 regardless of the Rb content. Thermal analysis by differential scanning calorimetry shows a considerable shift of the phase transition point towards lower temperatures with increasing Rb content. A pretransitional effect is observed by differential thermal analysis of the sample without Rb contribution while for the sample with 20% Rb the transition is represented by double endothermic peaks. The energy of transition has been estimated using the Kissinger method for samples with different concentrations of Rb

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Section: Introductionmentioning

confidence: 99%

The double-peak phenomenon of the phase transition of Rb substituting K in LiKSO₄, competition between Rb sub-lattice and smearing the phase transition

Gaffar

Ahmad

Yamada

et al. 2007

J. Phys. D: Appl. Phys.

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“…In addition, Hamed et al studied the thermal properties of lithium potassium ru bidium sulfate, (Li0 5_jc/2K0 3 _x/2Rb^. )2S 04, and lithium potassium caesium sulfate, (Li0 5_^/2Ko 5_^/2Csj:)2S 0 4 systems after partial replacement of K2S 0 4 and Li2S 0 4 by Rb2S 04 and Cs2S 0 4 [13,14]. They observed that in sertion of Rb2S 04 into LiKS04 crystal altered its ther mal behavior less than insertion of Cs2S 04.…”

Section: Introductionmentioning

confidence: 99%

Effect of Li Content on the DSC and Electrical Conductivity of (Li_1-xK_x)₂SO ₄ Mixed Crystals

Ahmad

Hefnia

2001

Zeitschrift Für Naturforschung A

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Differential scanning calorimetry on (Li1_J(K (.)2S 04 mixed crystals, where x = 0.01, 0.1, 0.3 and 0.5, revealed that, as the potassium content increases, the first high temperature phase of the intermediate LiKS04 phase at T -432 °C grows and shifts to higher temperature, and a double-phase mixture con sisting of LiKS04 and Li2S 04 exists for x< 0.5. Ionic conductivity measurements on (Li|_xK;t)2S 04 mixed crystals for x < 0.5 did show that the electrical conductivity increases as the Li2S 04 concentra tion increases, with an average activation energy of 0.9 eV. The enhanced electrical conductivity is pri marily a result of the increase in the Li+ ion (charge carriers) concentration and/or the formation of a diffuse space charge layer at the interface between the two phases.

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Phase transition in lithium ammonium sulphate doped with cesium metal ions

Gaafar

Kassem

Kandil

2000

Solid State Communications

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Study of the phase transition in lithium potassium rubidium sulfate system

Cited by 6 publications

References 19 publications

The double-peak phenomenon of the phase transition of Rb substituting K in LiKSO₄, competition between Rb sub-lattice and smearing the phase transition

The double-peak phenomenon of the phase transition of Rb substituting K in LiKSO₄, competition between Rb sub-lattice and smearing the phase transition

Effect of Li Content on the DSC and Electrical Conductivity of (Li_1-xK_x)₂SO ₄ Mixed Crystals

Phase transition in lithium ammonium sulphate doped with cesium metal ions

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Study of the phase transition in lithium potassium rubidium sulfate system

Cited by 6 publications

References 19 publications

The double-peak phenomenon of the phase transition of Rb substituting K in LiKSO4, competition between Rb sub-lattice and smearing the phase transition

The double-peak phenomenon of the phase transition of Rb substituting K in LiKSO4, competition between Rb sub-lattice and smearing the phase transition

Effect of Li Content on the DSC and Electrical Conductivity of (Li1-xKx)2SO 4 Mixed Crystals

Phase transition in lithium ammonium sulphate doped with cesium metal ions

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The double-peak phenomenon of the phase transition of Rb substituting K in LiKSO₄, competition between Rb sub-lattice and smearing the phase transition

The double-peak phenomenon of the phase transition of Rb substituting K in LiKSO₄, competition between Rb sub-lattice and smearing the phase transition

Effect of Li Content on the DSC and Electrical Conductivity of (Li_1-xK_x)₂SO ₄ Mixed Crystals