کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1333672 | 979091 | 2005 | 6 صفحه PDF | دانلود رایگان |
Electron paramagnetic resonance (EPR) and magnetic susceptibility measurements on the recently synthesized vanadates M2CrV3O11−x (M=Zn, Mg) have been analyzed. Two absorption lines with g ≈2.0 (type I) and g≈1.98g≈1.98 (type II) were recorded in the EPR spectra, which can be attributed to V4+ ions and Cr3+ ion clusters (pairs), respectively. The exchange constant J between Cr3+ 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 V4+ ions in the investigated compounds.
Temperature dependency of the integral EPR intensity for Cr3+ line.Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 178, Issue 7, July 2005, Pages 2231–2236