http://www.cnr.it/ontology/cnr/individuo/prodotto/ID195549
Thermal expansion and high temperature structure evolution of zoisite by single-crystal X-ray and neutron diffraction (Articolo in rivista)
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- Thermal expansion and high temperature structure evolution of zoisite by single-crystal X-ray and neutron diffraction (Articolo in rivista) (literal)
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- 2012-01-01T00:00:00+01:00 (literal)
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- 10.1007/s00269-011-0457-9 (literal)
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Càmara F. [1, 2] ; Gatta G.D. [3,4]; Meven M. [5]; Pasqual D. [6] (2012)
Thermal expansion and high temperature structure evolution of zoisite by single-crystal X-ray and neutron diffraction
in Physics and chemistry of minerals; Springer, Berlin (Germania)
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- Càmara F. [1, 2] ; Gatta G.D. [3,4]; Meven M. [5]; Pasqual D. [6] (literal)
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- http://link.springer.com/content/pdf/10.1007%2Fs00269-011-0457-9 (literal)
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- [1] Dipartimento di Scienze Mineralogiche e Petrologiche, Universita` degli Studi di Torino, Turin, Italy
[2] CNR-Istituto di Geoscienze e Georisorse, Pavia, Italy
[3] Dipartimento di Scienze della Terra, Universita` degli Studi di Milano, Milan, Italy
[4] CNR-Istituto per la Dinamica dei Processi Ambientali, Milan, Italy
[5] Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Munich, Germany
[6] Dipartimento di Geoscienze, Universita` di Padova, Padova, Italy (literal)
- Titolo
- Thermal expansion and high temperature structure evolution of zoisite by single-crystal X-ray and neutron diffraction (literal)
- Abstract
- The thermo-elastic behaviour and the temperature-induced structure evolution of a natural Fe-free zoisite have been investigated by in situ single-crystal X-ray and neutron diffraction. Neither discontinuities in volume expansion nor changes in symmetry have been observed up to 1,023 K. Zoisite shows a negative thermal expansion along [100] at T[700 K, while a continuous positive expansion occurs on the (100) plane. Two different regimes in the anisotropic thermal behaviour of zoisite can be distinguished (i.e. at T0 K and T[700 K), corresponding to an increase in the volumetric thermal expansion at T[700 K. The structure evolution with temperature has been described by a series of X-ray and neutron refinements at different temperatures. In particular,the M(3) polyhedra show a significant octahedral flattening and expansion in the equatorial plane with T. All [SiO4] tetrahedra show a regularization with increasing T. The neutron refinements show no change in the configuration of the hydrogen bonding at least up to 873 K. The effects of the T-induced main deformation mechanisms on the anisotropic elastic behaviour of zoisite are discussed. A comparison with the thermal behaviour of epidote has been carried out. (literal)
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