Crystal structure and XANES investigation of petzite, Ag3AuTe2

Hidetomo Hongu; Akira Yoshiasa; Massimo Nespolo; Tsubasa Tobase; Makoto Tokuda; Kazumasa Sugiyama

doi:10.1107/S2052520619002166

Crystal structure and XANES investigation of petzite, Ag₃AuTe₂

Hidetomo Hongu, Akira Yoshiasa, Massimo Nespolo, Tsubasa Tobase, Makoto Tokuda, Kazumasa Sugiyama

Materials Development Division

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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 L_III edges suggest that the chemical-bonding character of Au in petzite is more metallic than in other gold minerals.

Original language	English
Pages (from-to)	273-278
Number of pages	6
Journal	Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials
Volume	75
Issue number	2
DOIs	https://doi.org/10.1107/S2052520619002166
Publication status	Published - 2019 Apr

Keywords

Au L-edge XANES
Debye temperature
gold minerals
petzite
single-crystal structure analysis

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Metals and Alloys
Materials Chemistry

Access to Document

10.1107/S2052520619002166

Cite this

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title = "Crystal structure and XANES investigation of petzite, Ag3AuTe2",

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) {\AA}, 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.",

keywords = "Au L-edge XANES, Debye temperature, gold minerals, petzite, single-crystal structure analysis",

author = "Hidetomo Hongu and Akira Yoshiasa and Massimo Nespolo and Tsubasa Tobase and Makoto Tokuda and Kazumasa Sugiyama",

note = "Publisher Copyright: {\textcopyright} International Union of Crystallography, 2019",

year = "2019",

month = apr,

doi = "10.1107/S2052520619002166",

language = "English",

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AU - Hongu, Hidetomo

AU - Yoshiasa, Akira

AU - Nespolo, Massimo

AU - Tobase, Tsubasa

AU - Tokuda, Makoto

AU - Sugiyama, Kazumasa

N1 - Publisher Copyright: © International Union of Crystallography, 2019

PY - 2019/4

Y1 - 2019/4

N2 - 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.

AB - 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.

KW - Au L-edge XANES

KW - Debye temperature

KW - gold minerals

KW - petzite

KW - single-crystal structure analysis

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