On the crystal structure and compressional behaviour of talc: a mineral of interest in petrology and material science (Articolo in rivista)

Type
Label
  • On the crystal structure and compressional behaviour of talc: a mineral of interest in petrology and material science (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s00269-012-0554-4 (literal)
Alternative label
  • G. Diego Gatta, Marco Merlini, Giovanni Valdrè, Hanns-Peter Liermann, Gwilherm Nénert, André Rothkirch, Volker Kahlenberg, Alessandro Pavese (2012)
    On the crystal structure and compressional behaviour of talc: a mineral of interest in petrology and material science
    in Physics and chemistry of minerals
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. Diego Gatta, Marco Merlini, Giovanni Valdrè, Hanns-Peter Liermann, Gwilherm Nénert, André Rothkirch, Volker Kahlenberg, Alessandro Pavese (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://link.springer.com/content/pdf/10.1007%2Fs00269-012-0554-4 (literal)
Rivista
Note
  • Scopus (literal)
  • Google Scholar (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • G. D. Gatta (&) ? M. Merlini ? A. Pavese 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 ? A. Pavese CNR-Istituto per la Dinamica dei Processi Ambientali, Milan, Italy G. Valdre` Dipartimento di Scienze della Terra e Geologico-Ambientali, Universita` di Bologna, P. Porta San Donato 1, 40126 Bologna, Italy H.-P. Liermann ? A. Rothkirch DESY, HASYLAB, PETRA III, Notkestr. 85, 22607 Hamburg, Germany G. Ne´nert Institut Laue-Langevin, B.P. 156, 38042 Grenoble Cedex 9, France V. Kahlenberg Institut fu¨r Mineralogie und Petrographie, Universita¨t Innsbruck, Innrain 52, 6020 Innsbruck, Austria 123 Phys Chem Minerals DOI 10.1007/s00269-012-0554-4Talc is expected to play a significant role as a transport vehicle for water into the mantle via su (literal)
Titolo
  • On the crystal structure and compressional behaviour of talc: a mineral of interest in petrology and material science (literal)
Abstract
  • The crystal structure of a natural triclinic talc (1Tc polytype) [with composition: (Mg2.93Fe0.06 )R2.99 (Al0.02 Si3.97)R3.99O10(OH)2.10] has been investigated by singlecrystal X-ray diffraction at 223 and 170 K and by singlecrystal neutron diffraction at 20 K. Both the anisotropic X-ray refinements (i.e. at 223 and 170 K) show that the two independent tetrahedra are only slightly distorted. For the two independent Mg-octahedra, the bond distances between cation-hydroxyl groups are significantly shorter than the others. The ditrigonal rotation angle of the six-membered ring of tetrahedra is modest (a * 4?). The neutron structure refinement shows that the hydrogen-bonding scheme in talc consists of one donor site and three acceptors (i.e. trifurcated configuration), all the bonds having O???O B 3.38 A? , H???O * 2.8 A? , and O-H???O * 111-116?. The three acceptors belong to the six-membered ring of tetrahedra juxtaposed to the octahedral sheet. The vibrational regime of the proton site appears being only slightly anisotropic. The elastic behavior of talc was investigated by means of in situ synchrotron single-crystal diffraction up to 16 GPa (at room temperature) using a diamond anvil cell. No evidence of phase transition has been observed within the pressure range investigated. P-V data fit, with an isothermal third-order Birch-Murnaghan equation of state, results as follows: V0 = 454.7(10) A? 3 , KT0 = 56(3) GPa, and K 0 = 5.4(7). The ''Eulerian finite strain'' versus ''normalized stress'' plot yields: Fe(0) = 56(2) GPa and K 0 = 5.3(5). The compressional behavior of talc is strongly anisotropic, as reflected by the axial compressibilities (i.e. b(a):b(b):b(c) = 1.03:1:3.15) as well as by the magnitude and orientation of the unit-strain ellipsoid (with e1:e2:e3 = 1:1.37:3.21). A comparison between the elastic parameters of talc obtained in this study with those previously reported is carried out. (literal)
Prodotto di
Autore CNR

Incoming links:


Prodotto
Autore CNR di
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
data.CNR.it