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Atomic-scale observations of franckeite surface morphology
-
René B. Henriksen
,
Camilla Nissen
Published/Copyright:
March 28, 2015
Abstract
Franckeite, approximately Pb4.6Ag0.2Sn2.5Fe0.8Sb2S12.6, consists of alternating pseudohexagonal (H) and pseudotetragonal (Q) layers. Scanning tunneling microscopy (STM) and atomic force microscopy (AFM) of freshly cleaved franckeite, from San José, Bolivia, revealed the atomic structure of the pseudohexagonal component. On AFM images, the expected pattern with b = 3.2 Å was observed. STM revealed a √3 × √3 superstructure, with b' = 6.3 Å, interpreted to be caused by tunneling effects. The pseudotetragonal layer was not identified in any images.
Layer modulation, which results from the non-commensurate fit of the alternating H and Q layers, was observed with both AFM and STM. Modulation waves are sinusoidal and regular and they are always parallel. The calibrated modulation wavelengths averaged to 3.77, 4.10, 4.45, and 4.74 nm (with uncertainty ≤0.10 nm) corresponding to pseudotetragonal/pseudohexagonal (Q/H) matches of 13/12, 14/13, 15/14, and 16/15, respectively. These correspond with observations made using bulk analytical methods on individual members from the franckeite-cylindrite family but scanning probe microscopy (SPM) was able to show that Q/H match varies on a local scale, with sharp domain boundaries. Domains can be on the order of 150 nm in width.
Received: 2000-12-1
Accepted: 2002-6-28
Published Online: 2015-3-28
Published in Print: 2002-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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- Surface control vs. diffusion control during calcite dissolution: Dependence of step-edge velocity upon solution pH
- First-principles calculation of the infrared spectrum of lizardite
- Hard-mode infrared spectroscopy of perovskites across the CaTiO3-SrTiO3 solid solution
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- Experimental determination of the equilibria: rutile + magnesite = geikielite + CO2 and zircon + 2 magnesite = baddeleyite + forsterite + 2 CO2
- Symplectites derived from metastable phases in martian basaltic meteorites
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- Fluorite particles inducing butterfly aggregates of incipient microperthite in alkali feldspar from a syenite, the Patagonian Andes, southern Chile
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