Hydrothermal synthesis, characterization and structure refinement of chlorate- and perchlorate-sodalite

Veit, Th.; Buhl, Josef‐Christian; Hoffmann, Wolfgang

doi:10.1016/0920-5861(91)87019-j

Cited by 15 publications

(3 citation statements)

References 12 publications

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“…Earlier report shows that aluminosilicate sodalites have been synthesized by number of methods including hydrothermal method [14,15], high temperature method [16] and solid state synthesis [17]. In the present investigation, we have developed a one pot hydrothermal synthesis method.…”

Section: Methodsmentioning

confidence: 99%

One pot synthesis and crystal structure of aluminosilicate mixed chloro-iodo sodalite

Borhade¹,

Wakchaure²,

Dholi

2010

Indian J Phys

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The crystal structure of different compositions of aluminosilicate mixed chloride and iodide sodalites was studied. The sodalites have been characterized by X-ray powder diffraction using Reitveld refinement in the space group P 3n. FT-IR spectroscopy shows the successful enclathration of chloride and iodide anions in the -cages of sodalite. Different sodalites are prepared under low temperature hydrothermal conditions in which zeolite A is used as starting material with variation of concentration of sodium chloride and iodide. The products obtained were washed with deionized water and dried overnight at 100 0 C. The increase in concentration of iodide shows that the Al-O-Si angle and distances in Na 8 [AlSiO 4 ]Cl 2-x I x sodalite (0< x d 2) are modified considerably. Xray diffraction study clearly shows variation in unit cell from 8.9241 to 8.9910Å with increase in concentration of sodium iodide. IR study also shows pronounced shift in frequency with concentration of iodide. Amount of chloride and bromide was determined by potentiometry. SEM study shows cubic crystal morphology.

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Section: Methodsmentioning

confidence: 99%

One pot synthesis and crystal structure of aluminosilicate mixed chloro-iodo sodalite

Borhade¹,

Wakchaure²,

Dholi

2010

Indian J Phys

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“…Secondary phase formation is also indicated by changes in water IR absorbances. The broad O-H stretch at 3100 -3600 cm Ϫ1 and the bending mode near 1650 cm Ϫ1 can be assigned to water molecules (Buhl, 1991a(Buhl, , 1991bHermeler et al, 1991;Veit et al, 1991;Buhl et al, 2000). The intensities of these water IR bands increased with reaction time for Mt (Fig.…”

mentioning

confidence: 92%

Clay mineral weathering and contaminant dynamics in a caustic aqueous system

Choi

Crosson

Mueller

et al. 2005

Geochimica et Cosmochimica Acta

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“…Apart from several methods (Barrer et al, 1970;Veit et al, 1991;Buhl et al, 1991;Fleet, 1989) low temperature hydrothermal technique has been employed for the synthesis of Na 8 [GaSiO 4 ] 6 (ClO 4 ) 2 sodalite . The synthesis was carried out in a single step without precursors in Teflon autoclaves at a temperature of 100 o C and autogenous pressure for reaction time of seven days.…”

Section: Synthesis At Low Temperaturementioning

confidence: 99%

Synthesis, Characterization and Crystal Structure of Gallosilicate Perchlorate Sodalite

Borhade¹,

Dholi²,

Wakchaure³

2010

IJC

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Perchlorate enclathrated sodalite with gallosilicate host framework has been synthesized under low temperature (100 o C) hydrothermal technique and characterized by X-ray powder diffraction, IR, Raman spectroscopy, UV DRS, SEM, MAS NMR spectroscopy and thermogravimetry. The structural features were investigated by IR, MAS NMR spectroscopy of 29 Si and 23 Na nuclei and by Reitveld refinement of X-ray powder diffraction data. IR and Raman spectroscopy confirms formation of framework and presence of ClO 4 -group. The tetrahedral framework T-atoms are completely ordered and the chloride atoms are located at the centre of the sodalite cages. The crystal structure of this new sodalite was refined in the space group P 4 3n with a = 9.15788 Å, V = 768.5 Å, Z =1, Rwp = 0.0611, Rp = 0.1079 and Si-O-Ga is 144.036 o .The surface area of single entity with stoichiometry Na 8 [GaSiO 4 ] 6 (ClO 4 ) 2 was found to be 8.385x10 -15 cm 2 /g. 29Si MAS NMR study confirms complete ordering of Si and Ga in the gallosilicate framework. Thermo gravimetric analysis has provided information on the extent of perchlorate entrapment, stability within the cage and decomposition properties.

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Hydrothermal synthesis, characterization and structure refinement of chlorate- and perchlorate-sodalite

Cited by 15 publications

References 12 publications

One pot synthesis and crystal structure of aluminosilicate mixed chloro-iodo sodalite

One pot synthesis and crystal structure of aluminosilicate mixed chloro-iodo sodalite

Clay mineral weathering and contaminant dynamics in a caustic aqueous system

Synthesis, Characterization and Crystal Structure of Gallosilicate Perchlorate Sodalite

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