Crystal structure and XANES investigation of petzite, Ag3AuTe2

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Marco E. Ciriotti
Messaggi: 25787
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Crystal structure and XANES investigation of petzite, Ag3AuTe2

Messaggio da Marco E. Ciriotti » mar 12 feb, 2019 10:30

Prossima pubblicazione.

Referenza:
▪ Hongu, H., Yoshiasa, A., Nespolo, M., Tobase, T., Tokuda, M., Sugiyama, K. (2019): Crystal structure and XANES investigation of petzite, Ag3AuTe2. Acta Crystallographica, B75, (in press).

Synopsis:
Single-crystal XRD and XANES investigation of the mineral petzite is reported.
Marco E. Ciriotti

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

Avatar utente
Marco E. Ciriotti
Messaggi: 25787
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Crystal structure and XANES investigation of petzite, Ag3AuTe2

Messaggio da Marco E. Ciriotti » mer 10 apr, 2019 15:08

Pubblicazione effettuata.

Referenza:
▪ Hongu, H., Yoshiasa, A., Nespolo, M., Tobase, T., Tokuda, M., Sugiyama, K. (2019): Crystal structure and XANES investigation of petzite, Ag3AuTe2. Acta Crystallographica, B75, 273-278.

Abstract
Petzite, Ag3AuTe2, crystallizes in the space group I4132, which is a Sohncke type of space group where chiral crystal structures can occur. The structure refinement of petzite reported long ago [Frueh (1959). Am. Mineral.44, 693–701] did not provide any information about the absolute structure. A new single‐crystal X‐ray diffraction refinement has now been performed on a sample from Lake View Mine, Golden Mile, Kalgoorlie, Australia, which has resulted in a reliable absolute structure [a Flack parameter of 0.05 (3)], although this corresponds to the opposite enantiomorph reported previously. The minimum Te–Te distance is 3.767 (3) Å, slightly shorter than the van der Waals bonding distance, which suggests a weak interaction between the two chalcogens. XANES spectra near the Au and Te LIII edges suggest that the chemical‐bonding character of Au in petzite is more metallic than in other gold minerals.

_cell_length_a 10.417(8)
_cell_length_b 10.417(8)
_cell_length_c 10.417(8)
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1130.3(15)
Marco E. Ciriotti

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