A single-crystal neutron and X-ray diffraction study of pezzottaite, Cs(Be2Li)Al2Si6O18 (Articolo in rivista)

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  • A single-crystal neutron and X-ray diffraction study of pezzottaite, Cs(Be2Li)Al2Si6O18 (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s00269-012-0539-3 (literal)
Alternative label
  • G. Diego Gatta, Ilaria Adamo, Martin Meven, Erica Lambruschi (2012)
    A single-crystal neutron and X-ray diffraction study of pezzottaite, Cs(Be2Li)Al2Si6O18
    in Physics and chemistry of minerals
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. Diego Gatta, Ilaria Adamo, Martin Meven, Erica Lambruschi (literal)
Pagina inizio
  • 829 (literal)
Pagina fine
  • 840 (literal)
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  • http://link.springer.com/content/pdf/10.1007%2Fs00269-012-0539-3 (literal)
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  • 39 (literal)
Rivista
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  • 12 (literal)
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  • Google Scholar (literal)
  • ISI Web of Science (WOS) (literal)
  • Scopus (literal)
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  • G. D. Gatta (&) ? I. Adamo Dipartimento di Scienze Della Terra, Universita` degli Studi di Milano, Via Botticelli 23, 20133 Milan, Italy e-mail: diego.gatta@unimi.it G. D. Gatta ? I. Adamo CNR-Istituto Per la Dinamica dei Processi Ambientali, Milan, Italy M. Meven Institut fu¨r Kristallographie, RWTH Aachen, Ja¨gerstrasse 17-19, 52056 Aachen, Germany M. Meven Ju¨lich Centre for Neutron Science, Forschungszentrum Ju¨lich, Outstation at FRM II, Lichtenbergstrasse 1, 85747 Garching, Germany E. Lambruschi Dipartimento di Fisica, Universita` degli Studi di Parma, Via G.P. Usberti 7a, 43124 Parma, Italy (literal)
Titolo
  • A single-crystal neutron and X-ray diffraction study of pezzottaite, Cs(Be2Li)Al2Si6O18 (literal)
Abstract
  • The chemical composition and the crystal structure of pezzottaite [ideal composition Cs(Be2Li) Al2Si6O18 ; space group: R3c, a = 15.9615(6) A? , c = 27.8568(9) A? ] from the type locality in Ambatovita (central Madagascar) were investigated by electron microprobe analysis in wavelength dispersive mode, thermo-gravimetric analysis, Fourier-transform infrared spectroscopy, single-crystal X-ray (at 298 K) and neutron (at 2.3 K) diffraction. The average chemical formula of the sample of pezzottaite resulted Cs1,Cs2 (Cs0.565Rb0.027K0.017)R0.600 Na1,Na2 (Na0.101Ca0.024)R0.125Be2.078Li0.922 Al1,Al2 (Mg0.002 Mn0.002Fe0.003Al1.978 )R1.985 Si1,Si2,Si3 (Al0.056Si5.944 )R6O18 ? 0.27H2O. The (unpolarized) IR spectrum over the region 3,800-600 cm -1 was collected and a comparison with the absorption bands found in beryl carried out. In particular, two-weak absorption bands ascribable to the fundamental H2O stretching vibrations (i.e. 3,591 and 3,545 cm -1 ) were observed, despite the mineral being nominally anhydrous. The X-ray and neutron structure refinements showed: (a) a non-significant presence of aluminium, beryllium or lithium at the Si1, Si2 and Si3 sites, (b) the absence (at a significant level) of lithium at the octahedral Al1, Al2 and Al3 sites and (c) a partial lithium/beryllium disordering between tetrahedral Be and Li sites. (literal)
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