Crystal structure and XANES investigation of petzite, Ag3AuTe2

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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)273-278
Number of pages6
JournalActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials
Volume75
Issue number2
DOIs
Publication statusPublished - 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

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