Abstract
Solid reaction and sol–gel varieties of Cu 0.5Zr 2(PO 4) 3 phosphates have been investigated by magnetic susceptibility and electron paramagnetic resonance (EPR). As expected from the formulation, they contain an important amount of paramagnetic Cu 2+ ions. Room-temperature EPR spectra in the X and Q bands exhibit relatively different local information about paramagnetic environments related to structural properties. Analysis of the spectra reveals that Cu 2+ ions are distributed in two types of site. Computer simulations of EPR spectra have been realized: EPR parameters suggest that Cu 2+ environments are less distorted for the first type of site and more distorted for the second one. In the sol–gel variety the copper complex exhibits a larger distortion than in the solid reaction variety. The Cu 2+ ions are distributed in ratios of about 2/3 to 1/3 for the solid reaction variety and of about 60 to 40% for the sol–gel variety. From EPR parameters, it is found that the covalency of copper ion bonding with the surrounding oxygen atoms is appreciable.
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