Exchange-coupled pairs of Fe3+ ions in beryl |
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| Authors: | A Edgar DR Hutton |
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| Institution: | Department of Solid State Physics, Research School of Physical Sciences, Australian National University, Canberra, Australia 2600;Physics Department, Monash University, Melbourne, Australia 3168 |
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| Abstract: | The EPR spectrum of first nearest neighbour pairs of Fe3+ ions substituting for Al3+ ions in beryl is reported. The form of the pair spin Hamiltonian is discussed, and operator equivalent factors for fourth-order terms are tabulated. The Fe3+ pair interionic coupling corresponds to isotropic antiferromagnetic exchange with J = + 1.7 cm-1 plus anisotropic dipolar coupling. The pair value of the zero-field splitting parameter D is + 0.0206 cm-1 and shows a substantial shift from the single-ion value. It is proposed that resonance lines previously attributed to Fe3+ ions in Be2+ or Si4+ sites are due to Fe3+ pairs. |
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