Abstract
Electron paramagnetic resonance (EPR) and magnetic susceptibility measurements on the recently synthesized vanadates M 2CrV 3O 11− x ( M=Zn, Mg) have been analyzed. Two absorption lines with g≈2.0 (type I) and g ≈ 1.98 (type II) were recorded in the EPR spectra, which can be attributed to V 4+ ions and Cr 3+ ion clusters (pairs), respectively. The exchange constant J between Cr 3+ ions has been calculated, using both EPR and magnetic susceptibility data. Fitting of the EPR and magnetic susceptibility data has been carried out. The sign of J is a negative one for all samples and indicates antiferromagnetic interactions. Some difference in the J constant value among samples has been obtained. Volumetric titration confirms distinctly the presence of vanadium V 4+ ions in the investigated compounds.
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