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67Zn-Mössbauer study of nanostructured ZnO

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Abstract

Using the 93.31 keV Mössbauer transition in67Zn we have investigated hyperfine interactions and lattice-dynamic effects of nanostructured hexagonal (wurtzite) ZnO. The nanocrystals with particle sizes between 3 and 30 ran were produced by a reactive-gas sublimation method and were subsequently compacted into solid bodies under external pressure. The nanocrystalline materials were used as sources in Mössbauer emission experiments. A drastic increase of the asymmetry parameter was found fromη=0 (single crystal) toη≈0.5 (nanostructured material). Our theoretical Hartree-Fock cluster calculations show that displacements of the Zn atoms off the hexagonal symmetry axis as small as 0.005 Å can lead to such enhancedη parameters. The Lamb-Mössbauer factorf drastically drops when the particle size is reduced below ∼ 10 nm. Two lattice-dynamic models are discussed which successfully describe this behavior.

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Karzel, H., McMahon, G., Potzel, W. et al. 67Zn-Mössbauer study of nanostructured ZnO. Hyperfine Interact 95, 247–255 (1995). https://doi.org/10.1007/BF02146317

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