Structural investigation of cooperite (PtS) crystals

Journal Article · Tue Mar 15 04:00:00 EDT 2016 · Crystallography Reports

DOI:https://doi.org/10.1134/S1063774516020176· OSTI ID:22645582

Udovenko, A. A. ^[1]; Rubanov, S. V. ^[2]; Mudrovskaya, N. V. ^[3]

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1. Russian Academy of Sciences, Institute of Chemistry, Far East Branch (Russian Federation)
2. University of Melbourne, Bio21 Institute (Australia)
3. Russian Academy of Sciences, Institute of Geology and Nature Management, Far East Branch (Russian Federation)

The single-crystal structure of cooperite, a natural platinum sulfide PtS, is studied by X-ray diffraction supported by high-resolution scanning transmission electron microscopy and X-ray spectrum microanalysis. It is found that, in addition to the main reflections corresponding to the known tetragonal cell (a = 3.47 and c = 6.11 Å; space group P4{sub 2}/mmc), many weak reflections with intensities I ≤ 60σ(I) are clearly observed. These reflections fit the tetragonal cell (space group I4/mmm) with doubled parameters. In structures with small (P4{sub 2}/mmc) and large (I4/mmm) cells, the S atoms occupy statistically two special positions. It is shown that the chemical composition of the cooperite crystals deviates from the stoichiometric composition: sulfur-deficient specimens predominate.

• OSTI ID: 22645582
• Journal Information: Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 2 Vol. 61; ISSN CYSTE3; ISSN 1063-7745
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHEMICAL COMPOSITION
MONOCRYSTALS
PLATINUM SULFIDES
SPACE GROUPS
STOICHIOMETRY
TETRAGONAL LATTICES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION