http://www.cnr.it/ontology/cnr/individuo/prodotto/ID195675
On the crystal structure and compressional behaviour of talc: a mineral of interest in petrology and material science (Articolo in rivista)
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- 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)
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- 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)
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