Daliranite: determination of structure and chemical formula revision

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Marco E. Ciriotti
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Iscritto il: ven 25 giu, 2004 11:31
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Daliranite: determination of structure and chemical formula revision

Messaggio da Marco E. Ciriotti » mar 21 mag, 2019 10:19

Prossima pubblicazione.

Referenza:
▪ Lanza, A.E., Gemmi, M., Bindi, L., Mugnaioli, E., Paar, W.H. (2019): Daliranite, PbHgAs2S5: determination of the incommensurately modulated structure and revision of the chemical formula. Acta Crystallographica, B75, (in press).

Synapsis:
The modulated crystal structure of the mineral daliranite has been determined using 3D electron diffraction on nanocrystalline domains.
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: 25818
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Daliranite: determination of structure and chemical formula revision

Messaggio da Marco E. Ciriotti » sab 10 ago, 2019 18:58

Referenza:
▪ Lanza, A.E., Gemmi, M., Bindi, L., Mugnaioli, E., Paar, W.H. (2019): Daliranite, PbHgAs2S5: determination of the incommensurately modulated structure and revision of the chemical formula. Acta Crystallographica, B75, 711-716.
Abstract:
The incommensurately modulated crystal structure of the mineral daliranite has been determined using 3D electron diffraction data obtained on nanocrystalline domains. Daliranite is orthorhombic with a = 21, b = 4.3, c = 9.5 Å and shows modulation satellites along c. The solution of the average structure in the Pnma space group together with energy‐dispersive X‐ray spectroscopy data obtained on the same domains indicate a chemical formula of PbHgAs2S5, which has one S fewer than previously reported. The crystal structure of daliranite is built from columns of face‐sharing PbS8 bicapped trigonal prisms laterally connected by [2+4]Hg polyhedra and (As3+2S5)4− groups. The excellent quality of the electron diffraction data allows a structural model to be built for the modulated structure in superspace, which shows that the modulation is due to an alternated occupancy of a split As site.
Marco E. Ciriotti

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

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