Structural, calorimetric and conductivity study of the new mixed solution Rb2(SO4)0.5(SeO4)0.5Te(OH)6

Abdelhedi, Mohamed; Dammak, M.; Cousson, A.; Kolsi, A. W.

doi:10.1016/j.jallcom.2005.03.001

Cited by 16 publications

(13 citation statements)

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“…The S/Se-O distances in the (RbNaSSeTe) structure, vary between 1.483(6) Å and 1.516(6) Å with O-S/Se-O angles ranging between 106.95(4) and 111.08(3)°. The difference between these values and these obtained in the (RbSSeTe) and (KSSeTe) compounds [1,2], confirms the effect of the increasing of the cation radii.…”

Section: Structural Studysupporting

confidence: 56%

“…The RbNaSSeTe structure is stabilized by O-HÁÁÁO hydrogen bonds, assured by proton belonging to a hydroxyl groups. Table 6 Observed Raman and IR frequencies (cm -1 ) and band assignments for Rb 1 The interest in the (RbNaSSeTe) material is the presence of a three-phase transition observed in the DSC curve at 412, 467 and 479 K. The vibrational study of the (RbNaSSeTe) was necessary to observe the coupling of different vibrating groups. The fact that splitting due to the interaction between the three anions was not observed, suggests that both anions vibrate independently in the crystal.…”

Section: Resultsmentioning

confidence: 99%

“…Some of these compounds of general formula M 2 AO 4 Te(OH) 6 (where M is a monovalent cation and A = S, Se, P…) have received much attention in an effort to understand their properties and develop new materials. The potassium sulphate selenate tellurate K 2 (SO 4 ) 0.97 (SeO 4 ) 0.03 Te(OH) 6 (KSSeTe) crystallize in the triclinic space group P-1 whereas the rubidium sulphate selenate tellurate Rb 2 (SO 4 ) 0.5 (SeO 4 ) 0.5 Te(OH) 6 (RbSSeTe) crystallize in the monoclinic space group P2 1 /c [1,2]. Alkali sulphate-selenate tellurate exhibit a structural phase transition and has interesting physical properties such as ferroelectricity and super-ionic-protonic conduction [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Characterization and X-ray Crystal Structures of the New Mixed Compound Rb1.89Na0.11(SO4)0.89(SeO4)0.11Te(OH)6

2015

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At room temperature, the new compound Rb 1.89 Na 0.11 (SO 4 ) 0.89 (SeO 4 ). 011 Te(OH) 6 crystallizes in the monoclinic system with space group P2 1 /c. The unit cell parameters are: a = 13.655 Å (4), b = 6.681 Å (4), c = 11.497 Å , b = 107.07°(3), V = 1002.60(5) Å 3 , Z = 4 and q cal = 3.26 g.cm -1 . The structure is stabilized by interplanar O-HÁÁÁO hydrogen bonds involving all the H atoms that belong to the OH groups of the Te(OH) 6 octahedra. Raman spectra of the material recorded at various temperatures (300-500 K) in the frequency range 100-1000 cm -1 and IR spectra achieved at room temperature between 600 and 3500 cm -1 , confirm the presence of all the phase transitions detected in the material and show that anionic groups coexist independently in the same crystal. Graphical Abstract& M. Abdelhedi

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Section: Structural Studysupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis, Characterization and X-ray Crystal Structures of the New Mixed Compound Rb1.89Na0.11(SO4)0.89(SeO4)0.11Te(OH)6

2015

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“…3 We have been continuing our study of sulfate-selenate solid solutions of tellurate salts, among which we have reported Rb2[( S0.5Se0.5)O4]Te(OH)6 and Cs2 [(S0.57Se0.43)O4]Te(OH)6. 4,5 We have now prepared Tl2[(S0.6Se0.4)O4]Te(OH)6. In this study we clearly show the crystallographic differences and the effect of extensions of the anionic and cationic volume groups, which can help us to understand which, if any, geometrical features can be responsible for the electrical properties.…”

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confidence: 99%

“…4,5 We have now prepared Tl2[(S0.6Se0.4)O4]Te(OH)6. In this study we clearly show the crystallographic differences and the effect of extensions of the anionic and cationic volume groups, which can help us to understand which, if any, geometrical features can be responsible for the electrical properties.…”

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Synthesis and Crystal Structure of Tl2[(S0.6Se0.4)O4]Te(OH)6

Abdelhedi¹,

Dammak

Kolsi

et al. 2008

Anal. Sci. X

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Alkali-sulfate and selenate tellurate compounds having the formula M2XO4Te(OH)6 with (M= K, NH4, Tl and X= S, Se) have been crystallographically studied in order to examine the effect and the influence of cationic and/or anionic substitution over the crystalline symmetry and physical properties. The ammonium sulfate tellurate, (NH4)2SO4Te(OH)6, is monoclinic Cc, whereas the (NH4)2SeO4Te(OH)6 material crystallizes in the P21/c space group.1,2 On the other hand, the thallium sulfate tellurate Tl2SO4Te(OH)6 crystallizes in the P21/a space group. 3 We have been continuing our study of sulfate-selenate solid solutions of tellurate salts, among which we have reported Rb2[( S0.5Se0.5)O4]Te(OH)6 and Cs2 [(S0.57Se0.43)O4]Te(OH)6. 4,5 We have now prepared Tl2[(S0.6Se0.4)O4]Te(OH)6. In this study we clearly show the crystallographic differences and the effect of extensions of the anionic and cationic volume groups, which can help us to understand which, if any, geometrical features can be responsible for the electrical properties.Crystals of TlSSeTe were prepared at room temperature by the slow evaporation of an aqueous solution of a mixture of telluric acid, H6TeO6 (Aldrich, 99%), thallium carbonate Tl2C O3 (Aldrich 99.9%), selenic acid H2SeO4 (Aldrich 94%) and thallium sulfate Tl2SO4 (Aldrich 99.999%) at room temperature (The stoichiometric ratio is 1:0.5:0.5:0.5).Schematically the reactions are:Several recrystallizations were necessary to obtain single crystals suitable for an X-ray diffraction study. The composition of the obtained crystals was determined by chemical analysis, and confirmed by a crystal-structure refinement. A schematic diagram of the compound is shown in Fig. 1. The unit-cell dimensions were measured and refined using indexation of diffraction markings collected with a BrukerNonius X8-APEX2 CCD area-detector diffractometer using the APEX2 program. The structure of Tl2[(S0.6Se0.4)O4]Te(OH)6 was analyzed with the crystallographic CRYSTALS program. Density was measured, at room temperature, using the pycnometric method, by flotation in CCl4. The chemical crystal data, the parameters used for the X-ray diffraction data collection and the strategy used for the crystal structure determination and their results are listed in Table 1. The final positions and equivalent isotropic thermal parameters are given in Table 2. Hydrogen atoms were not determined. X-ray Structure Analysis Online Synthesis and Crystal

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Structural, Calorimetric and Conductivity Study of the New Mixed Solution Rb₂(SO₄)_0.5 (SeO₄)_0.5Te(OH)₆.

Abdelhedi¹,

Dammak²,

Cousson³

et al. 2005

ChemInform

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Structure D 2000Structural, Calorimetric and Conductivity Study of the New Mixed Solution Rb2(SO4)0.5(SeO4)0.5Te(OH)6. -Single crystals of the new mixed solid solution of title are obtained from an aq. solution of H6TeO6, Rb2SO4 and Rb2SeO4 upon slow evaporation. Rb2(SO4)0.5(SeO4)0.5Te(OH)6 crystallizes in the monoclinic space group P21/c with Z = 4. The structure is characterized by the presence of different independent anions in the same crystal , and ). The anions are arranged in a number of sheets of pure S/SeO4 tetrahedra alternating with sheets of pure Te(OH)6 octahedra. The structure is stabilized by OH···O hydrogen bonds which link tetrahedral and octahedral anions. DSC results show two anomalies at about 420 and 500 K, which are analyzed by dielectric measurements using the impedance spectroscopy technique. -(ABDELHEDI, M.; DAMMAK*, M.; COUSSON, A.; KOLSI, A. W.; J. Alloys Compd. 398 (2005) 1-2, 55-61; Lab. Chim. Inorg., Fac. Sci. Sfax, 3018 Sfax, Tunisia; Eng.) -Schramke 38-007 (SO 2-4 S eO 2-4 T eO 6-6

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Structural, calorimetric and conductivity study of the new mixed solution Rb2(SO4)0.5(SeO4)0.5Te(OH)6

Cited by 16 publications

References 14 publications

Synthesis, Characterization and X-ray Crystal Structures of the New Mixed Compound Rb1.89Na0.11(SO4)0.89(SeO4)0.11Te(OH)6

Synthesis, Characterization and X-ray Crystal Structures of the New Mixed Compound Rb1.89Na0.11(SO4)0.89(SeO4)0.11Te(OH)6

Synthesis and Crystal Structure of Tl2[(S0.6Se0.4)O4]Te(OH)6

Structural, Calorimetric and Conductivity Study of the New Mixed Solution Rb₂(SO₄)_0.5 (SeO₄)_0.5Te(OH)₆.

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Structural, calorimetric and conductivity study of the new mixed solution Rb2(SO4)0.5(SeO4)0.5Te(OH)6

Cited by 16 publications

References 14 publications

Synthesis, Characterization and X-ray Crystal Structures of the New Mixed Compound Rb1.89Na0.11(SO4)0.89(SeO4)0.11Te(OH)6

Synthesis, Characterization and X-ray Crystal Structures of the New Mixed Compound Rb1.89Na0.11(SO4)0.89(SeO4)0.11Te(OH)6

Synthesis and Crystal Structure of Tl2[(S0.6Se0.4)O4]Te(OH)6