Refinement of the structure of synthetic syngenite K2Ca(SO4)2 H2O from X-ray powder diffraction data (Articolo in rivista)

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  • Refinement of the structure of synthetic syngenite K2Ca(SO4)2 H2O from X-ray powder diffraction data (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1127/0077-7757/2005/0027 (literal)
Alternative label
  • Ballirano P.; Belardi G.; Maras A. (2005)
    Refinement of the structure of synthetic syngenite K2Ca(SO4)2 H2O from X-ray powder diffraction data
    in Neues Jahrbuch für Mineralogie. Abhandlungen; E SCHWEIZERBARTSCHE VERLAGS, Stuttgart (Germania)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ballirano P.; Belardi G.; Maras A. (literal)
Pagina inizio
  • 15 (literal)
Pagina fine
  • 21 (literal)
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  • http://www.schweizerbart.de/journals/njma (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 182/1 (literal)
Rivista
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  • 7 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
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  • Dipartimento di Scienze della Terra Università di Roma \"La Sapienza\", Piazzale Aldo Moro, 5 - Roma I-00185; Istituto di Geologia Ambientale e Geoingegneria, Roma (literal)
Titolo
  • Refinement of the structure of synthetic syngenite K2Ca(SO4)2 H2O from X-ray powder diffraction data (literal)
Abstract
  • The refinement of the crystal structure of synthetic syngenite K2Ca(SO4) center dot H2O has been carried out through the Rietveld method on X-ray powder diffraction data. Space group is P2(1)/m, a = 9.7710 (2) angstrom, b = 7.1449 (2) angstrom, c = 6.2469 (1) angstrom, beta = 103.992 (2). Conventional agreement indices are Rp = 5.26 %, wRp = 7.02 %, R-F = 3.91 %, reduced chi(2) = 1.185. The structure consists of an alternation of sheets made of columns of KO8 polyhedra linked by zig-zag chains of CaO9 polyhedra and by two independent sulfate groups S1 and S2. Both Ca and K cations coordinate the water molecule and each H forms a hydrogen-bond with O4. The Ow...O4 distance of 2.69 (1) angstrom is in good agreement with 2.75 angstrom derived from IR measurements. (literal)
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