Abstract
A strong spin-spin interaction between oxygen vacancy and Mg in ZnMgO nanorods has been manifested by electron paramagnetic resonance (EPR) studies from symmetrical hyperfine structure. Mg probably occupies Zn sites as a result of meta-stable coordination. 25Mg have nuclear spin I = 5/2 that can give rise to spin resonance with the unpaired spin S = 1/2 of VO+ in ZnO having (2n + 1) = 6 number of splitting as observed in the EPR spectra. On heating at 500 °C, the hyperfine structure disappears as Mg moves to the interstitial sites. The results are further supported by x-ray diffraction and photoluminescence results.
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