Abstract
The 93.31-keV Mössbauer resonance in67Zn is used to determine tiny changes of the transition energy. We first report on a gravitational redshift (GRS) experiment with67GaZnO single crystal source and67ZnO powder as absorber. The results on the GRS show that solid state effects which are difficult to control experimentally, in particular the extreme sensitivity of the electric field gradient tensor (efg) in67ZnO to small external pressure, finally limit the accuracy in determining the GRS. The resonance has been further employed to investigate solid state properties of67ZnO with high precision. At large pressures67ZnO exhibits a phase transition from hep (wurtzite) to fcc (NaCl) structure. The changes of the efg and of the s-electron density θ(0) at the67Zn nucleus with reduced unit cell volume show that covalency of the Zn-O bond plays and essential role. We have performed self-consistent Hartree-Pock cluster calculations to describe the experimental changes of θ(0) in detail.
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Potzel, W. 67Zn Mössbauer spectroscopy. Hyperfine Interact 71, 1515–1522 (1992). https://doi.org/10.1007/BF02397370
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DOI: https://doi.org/10.1007/BF02397370