Abstract
The effect of pressure on the Mössbauer isomer shift and quadrupole splitting was studied with the 77 keV resonance of197Au in the Au(I)-cyanides AuCN and KAu(CN)2 at 4.2 K under pressures up to 80 kbar. We observe an increase of the electron density and a decrease of the absolute value of the electric field gradient at the Au nuclei in both compounds with pressure. This variation is different from the correlation that has been established for these parameters within the chemical series of Au(I) compounds at ambient pressure. It indicates that theπ-bonding increases strongly under pressure. X-ray diffraction studies on AuCN under pressures up to 115 kbar together with investigations of the Goldanskii-Karyagin-effect on AuCN at ambient pressure support the previous assumption that the sign of the electric field gradient at the Au(I) sites is negative.
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Prosser, H., Wortmann, G., Syassen, K. et al. Effect of pressure on the Mössbauer isomer shift and quadrupole splitting in Au(I)-cyanides. Z Physik B 24, 7–14 (1976). https://doi.org/10.1007/BF01312868
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DOI: https://doi.org/10.1007/BF01312868