• crystal structure of kuzel's salt 3cao·al2o3·1/2caso4·1/2cacl2·11h2o determined by synchrotron powder diffraction

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     the crystal structure of kuzel's salt has been successfully determined by synchrotron powder diffraction. it crystallizes in the rhombohedral r3̅ symmetry with a = 5.7508 (2) å, c = 50.418 (3) å, v = 1444.04 (11) å3. joint rietveld refinement was realized using three x-ray powder patterns recorded with a unique wavelength and three different sample-to-detector distances. kuzel's salt is the chloro-sulfoaluminate afm phase and belongs to the layered double hydroxide (ldh) large family. its structure is composed of positively charged main layer [ca2al(oh)6]+ and negatively charged interlayer [cl0.50·(so4)0.25·2.5h2o]. chloride and sulfate anions are ordered into two independent crystallographic sites and fill successive interlayer leading to the formation of a second-stage compound. the two kinds of interlayer have the compositions [cl·2h2o] and [(so4)0.5·3h2o]. the crystal structure explains why chloride and sulfate anions are not substituted and why the formation of extended solid solution in the chloro-sulfate afm system does not occur.

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