Characterisation of contact twinning for cerussite, PbCO3, by single-crystal NMR spectroscopy

Zeman, Otto E. O.; Steinadler, Jennifer; Hochleitner, Rupert und Bräuniger, Thomas (2021): Characterisation of contact twinning for cerussite, PbCO3, by single-crystal NMR spectroscopy. In: Physics and Chemistry of Minerals, Vol. 48, No. 11, 40

Abstract

Cerussite, PbCO3, like all members of the aragonite group, shows a tendency to form twins, due to high pseudo-symmetry within the crystal structure. We here demonstrate that the twin law of a cerussite contact twin may be established using only Pb-207-NMR spectroscopy. This is achieved by a global fit of several sets of orientation-dependent spectra acquired from the twin specimen, allowing to determine the relative orientation of the twin domains. Also, the full Pb-207 chemical shift tensor in cerussite at room temperature is determined from these data, with the eigenvalues being delta(11) = (-2315 +/- 1) ppm, delta(22) = (-2492 +/- 3) ppm, and delta(33) = (-3071 +/- 3) ppm.

• Item Type: Journal article
• Faculties: Chemistry and Pharmacy > Department of Chemistry
• Subjects: 500 Science > 540 Chemistry
• ISSN: 0342-1791
• Language: English