High-temperature behaviour of melilite: in situ X-ray diffraction study of gehlenite-akermanite-Na melilite solid solution
Articolo
Data di Pubblicazione:
2008
Citazione:
High-temperature behaviour of melilite: in situ X-ray diffraction study of gehlenite-akermanite-Na melilite solid solution / M. Merlini, M. Gemmi, G. Cruciani, G. Artioli. - In: AMERICAN MINERALOGIST. - ISSN 0003-004X. - 35:3(2008), pp. 147-155.
Abstract:
High-temperature X-ray diffraction experiments have been performed on melilite solid solutions, on single crystal and powder samples. In åkermanite-gehlenite series, the volumetric thermal expansion increases from gehlenite, 26.5(2) E-06 K-1, to åkermanite, 31.2(1) E-06 K-1. The variation is related to the cation content in the tetrahedral T1 site of the structure, and the linear expansion along the a axis has the greatest variation as a function of composition. The expansion perpendicular to the tetrahedral layers does not present any significant variation as a function of composition. In the åkermanite-Na melilite series, the presence of Na in the [8]-coordinated site strongly increases the linear expansion along the c axis, while the volumetric expansion decreases from åkermanite to Na melilite, whose value can be extrapolated to 27.4 E-06 K-1
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
High temperature; Melilite; Solid solution; Thermal expansion; X-ray diffraction
Elenco autori:
M. Merlini, M. Gemmi, G. Cruciani, G. Artioli
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