Structural transition of Friedel's salt 3CaO dot Al<sub>2</sub>O<sub>3</sub> dot CaCl<sub>2</sub> dot 10H<sub>2 </sub>O studied by synchrotron powder diffraction: Fid-Bau Portal

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Structural transition of Friedel's salt 3CaO dot Al₂O₃ dot CaCl₂ dot 10H₂ O studied by synchrotron powder diffraction

Rapin, J.P. / Renaudin, G. / Elkaim, E. / Francois, M.

The structural phase transition occurring in Friedel's salt, the chlorinated compound 3CaO dot Al₂O₃ dot CaCl₂ dot 10H₂ O (AFm phase), was studied by synchrotron and standard X-ray powder diffraction. The compound transforms at 35 degree C from a rhombohedral (rh) high-temperature (HT) phase (R-3c; a=5.744(2) A, c=46.890(3) A) to a monoclinic (m) low-temperature (LT) phase (C2/c; a=9.960(4) A, b=5.7320(2) A, c=16.268(7) A, beta=104.471(2) degree). The LT and HT phases were refined with the Rietveld method from synchrotron data recorded at 20 and 40 degree C. Variations of the lattice parameters as a function of temperature are reported between 8 and 48 degree C. The rh --> m transition is characterized by a unit cell volume expansion of 1% and a movement of the interlayer species: a shift of 0.45 A of the Cl^- anions along (0 1 0)_h and a shift of 0.25 A of the water molecules along (2 1 0)_h of the hexagonal cell. The m phase distortion is due to an ordering of the hydrogen bonds between chloride anions and H-atoms of the water molecules.

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Structural transition of Friedel's salt 3CaO dot Al₂O₃ dot CaCl₂ dot 10H₂ O studied by synchrotron powder diffraction

Rapin, J.P. / Renaudin, G. / Elkaim, E. / Francois, M.

The structural phase transition occurring in Friedel's salt, the chlorinated compound 3CaO dot Al₂O₃ dot CaCl₂ dot 10H₂ O (AFm phase), was studied by synchrotron and standard X-ray powder diffraction. The compound transforms at 35 degree C from a rhombohedral (rh) high-temperature (HT) phase (R-3c; a=5.744(2) A, c=46.890(3) A) to a monoclinic (m) low-temperature (LT) phase (C2/c; a=9.960(4) A, b=5.7320(2) A, c=16.268(7) A, beta=104.471(2) degree). The LT and HT phases were refined with the Rietveld method from synchrotron data recorded at 20 and 40 degree C. Variations of the lattice parameters as a function of temperature are reported between 8 and 48 degree C. The rh --> m transition is characterized by a unit cell volume expansion of 1% and a movement of the interlayer species: a shift of 0.45 A of the Cl^- anions along (0 1 0)_h and a shift of 0.25 A of the water molecules along (2 1 0)_h of the hexagonal cell. The m phase distortion is due to an ordering of the hydrogen bonds between chloride anions and H-atoms of the water molecules.

Structural transition of Friedel's salt 3CaO dot Al₂O₃ dot CaCl₂ dot 10H₂ O studied by synchrotron powder diffraction

Rapin, J.P. / Renaudin, G. / Elkaim, E. / Francois, M.

The structural phase transition occurring in Friedel's salt, the chlorinated compound 3CaO dot Al₂O₃ dot CaCl₂ dot 10H₂ O (AFm phase), was studied by synchrotron and standard X-ray powder diffraction. The compound transforms at 35 degree C from a rhombohedral (rh) high-temperature (HT) phase (R-3c; a=5.744(2) A, c=46.890(3) A) to a monoclinic (m) low-temperature (LT) phase (C2/c; a=9.960(4) A, b=5.7320(2) A, c=16.268(7) A, beta=104.471(2) degree). The LT and HT phases were refined with the Rietveld method from synchrotron data recorded at 20 and 40 degree C. Variations of the lattice parameters as a function of temperature are reported between 8 and 48 degree C. The rh --> m transition is characterized by a unit cell volume expansion of 1% and a movement of the interlayer species: a shift of 0.45 A of the Cl^- anions along (0 1 0)_h and a shift of 0.25 A of the water molecules along (2 1 0)_h of the hexagonal cell. The m phase distortion is due to an ordering of the hydrogen bonds between chloride anions and H-atoms of the water molecules.

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Title:

Structural transition of Friedel's salt 3CaO dot Al₂O₃ dot CaCl₂ dot 10H₂ O studied by synchrotron powder diffraction

Contributors:

Rapin, J.P. (author) / Renaudin, G. (author) / Elkaim, E. (author) / Francois, M. (author)

Published in:

Cement and Concrete Research ; 32 ; 513-519

Publication date:

2002

Size:

7 Seiten, 18 Quellen

ISSN:

DOI:

https://doi.org/10.1016/S0008-8846(01)00716-5

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Phasenumwandlung , Synchrotronstrahlung , Kristallstruktur , Zement , Einkristall , Anion , Wasserstoffbrücke , Temperatureinfluss , Calciumchlorid

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