Abstract
Abstract Electron magnetic resonance (EMR) spectra of gadolinium-doped zircon (ZrSiO 4 ) powders have been studied at room temperature for gadolinium concentrations between 0.20 and 1.0 mol%. The results suggest that Gd 3+ ions occupy substitutional sites in the zircon lattice, that the electron magnetic resonance linewidth increases with increasing gadolinium concentration and that the range of the exchange interaction between Gd 3+ ions is about 1.17 nm, larger than that of the same ion in other host lattices, such as ceria (CeO 2 ), strontium oxide (SrO) and calcium oxide (CaO). The fact that the electron magnetic resonance linewidth of the Gd 3+ ion in polycrystalline zircon increases, regularly and predictably, with Gd concentration, shows that the Gd 3+ ion can be used as a probe to study, rapidly and non-destructively, the crystallinity and degradation of ZrSiO 4 .
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