Referenza:
▪ Rozhdestvina, V.I., Udovenko, A.A., Rubanov, S.V., Mudrovskaya, N.V. (2016): Structural investigation of cooperite (PtS) crystals. Crystallography Reports, 61, 193-202.
Abstract:
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 P42/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 (P42/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.
Structural investigation of cooperite (PtS) crystals
- Marco E. Ciriotti
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Structural investigation of cooperite (PtS) crystals
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
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