In situ high temperature single crystal X-ray diffraction (XRD) experiments have been performed on a chemically quasi-ideal omphacite sample [(Ca0.49Na0.51)(Σ1)(Mg0.46Al0.48Fe0.063+)(Σ1)(Si1.97 Al0.03)(Σ2)O6], up to 1000°C. The lattice parameters were studied as a function of temperature, and their thermal expansion coefficients determined. The b and c cell edges show discontinuities as a function of temperature which are interpreted here in terms of intracrystalline cation diffusion processes. Structure refinements have been carried out using data collected at room temperature, at 800°C and at ambient conditions after cooling. The structural behaviour as a function of temperature of chemically quasi-ideal omphacites is compared with those of jadeite and diopside.

In situ high temperature single crystal X-ray diffraction study of a natural omphacite / A. Pavese, R. Bocchio, G. Ivaldi. - In: MINERALOGICAL MAGAZINE. - ISSN 0026-461X. - 64:6(2000), pp. 983-993.

In situ high temperature single crystal X-ray diffraction study of a natural omphacite

A. Pavese
Primo
;
R. Bocchio
Secondo
;
2000

Abstract

In situ high temperature single crystal X-ray diffraction (XRD) experiments have been performed on a chemically quasi-ideal omphacite sample [(Ca0.49Na0.51)(Σ1)(Mg0.46Al0.48Fe0.063+)(Σ1)(Si1.97 Al0.03)(Σ2)O6], up to 1000°C. The lattice parameters were studied as a function of temperature, and their thermal expansion coefficients determined. The b and c cell edges show discontinuities as a function of temperature which are interpreted here in terms of intracrystalline cation diffusion processes. Structure refinements have been carried out using data collected at room temperature, at 800°C and at ambient conditions after cooling. The structural behaviour as a function of temperature of chemically quasi-ideal omphacites is compared with those of jadeite and diopside.
Settore GEO/06 - Mineralogia
Article (author)
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/179264
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 19
  • ???jsp.display-item.citation.isi??? 17
social impact