Crystal chemistry of arsenian pyrites: A Raman spectroscopic study

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
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Crystal chemistry of arsenian pyrites: A Raman spectroscopic study

Messaggio da Marco E. Ciriotti » lun 20 set, 2021 14:40

Prossima pubblicazione.

Referenza:
▪ Zhang, He, Qian, G., Cai, Y., Gibson, C., Pring, A. (2022): The crystal chemistry of arsenian pyrites: A Raman spectroscopic study. American Mineralogist, 107, (in press).

Abstract:
A Raman spectroscopy study of the nature of the As-S substitution in natural arsenian pyrite (Fe(S,As)2) is presented covering the compositional range (0.01 at% –4.6 at% As). Three Raman-active modes were resolved in the spectrum of the nearly pure pyrite: the Eg (344 cm-1), Ag (379 cm-1), and Tg(3) (432 cm-1) modes. The Raman vibrational modes exhibit the one-mode behavior and the wavenumbers of optical modes vary continuously and approximately linearly with the As content in the arsenian pyrite, correlating with the change in bond constants with increasing substitution of As for S. The linewidth of the Ag mode was also found to increase with increasing As substitution and this is attributed to the increase in lattice strain associated with the substitution of As for S. This study provides experimental evidence for the As-induced structural evolution of pyrite from being stable to metastable before decomposing into other phases. This study illustrates that a systematic Raman spectroscopic investigation of the crystal chemistry of arsenian pyrite enables us to further understand this process of the structural strain associated with elemental substitution. The results of this study and the results of another recent Raman study of arsenian pyrite where As substitution has a more complex form indicates that it is not possible to use the shift in the Raman bands to establish the As content, but rather for a given As content it is possible to establish the nature of the As substitution, As for S or As for Fe or both.

NdR: Interessante lavoro per ramanisti... e non solo.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: Crystal chemistry of arsenian pyrites: A Raman spectroscopic study

Messaggio da Marco E. Ciriotti » ven 04 feb, 2022 12:26

Pubblicazione effettuata.

Referenza:
▪ Zhang, He, Qian, G., Cai, Y., Gibson, C., Pring, A. (2022): The crystal chemistry of arsenian pyrites: A Raman spectroscopic study. American Mineralogist, 107, 274–281.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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