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QUADRUPOLE SPLITTING OF MOSSBAUER LINES DUE TO DEFECTS IN CO0

BARBERAN, N; TASKER, PW; STONEHAM, AM; (1979) QUADRUPOLE SPLITTING OF MOSSBAUER LINES DUE TO DEFECTS IN CO0. J PHYS C SOLID STATE , 12 (18) 3827 - 3835. 10.1088/0022-3719/12/18/028. Green open access

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Abstract

The Fe3+ lines observed in CoO Mossbauer sources may arise from the decay of Co3+ ions associated with cation vacancies in the crystal. These defects produce an electric-field gradient that causes a quadrupole splitting of the resonance line and that can, in principle, distinguish between different types of defects. The calculation of the quadrupole splitting at Fe2+ and Fe3+ sites near various vacancy clusters includes the relaxation of the lattice about the defect. This lattice polarisation and distortion is shown to be extremely important, since simple calculations based on perfect ion positions give very different field gradients at neighbouring sites. The results compared with the experiments available and the quadrupole splittings observed are close to those predicted by a vacancy model.

Type: Article
Title: QUADRUPOLE SPLITTING OF MOSSBAUER LINES DUE TO DEFECTS IN CO0
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0022-3719/12/18/028
Publisher version: http://dx.doi.org/10.1088/0022-3719/12/18/028
Language: English
Additional information: Text made available to UCL Discovery by kind permission of IOP Publishing, 2012
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/59705
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