Jump to main content
Jump to site search


Implications of including a magnetic ion (Cr3+ and Fe3+) at the vanadium site in geometrically frustrated spinel MgV2O4: Magnetic and Catalytic properties

Abstract

The vanadium sublattice in geometrically frustrated MgV2O4 is substituted partially with Cr3+ and Fe3+. From successful Rietveld refinement of powder X-ray diffraction patterns of MgVCrO4 and MgVFeO4, Cr and Fe occupy octahedral sites of spinel structure. Extensive field-dependent and temperature magnetic measurements on these samples reveal exciting results. MgV2O4 remained paramagnetic till 3 K, with a small divergence at around 20 K between ZFC and FC data. MgVCrO4 exhibits antiferromagnetic behavior with a Neel temperature of 13.6 K. MgVFeO4 shows spin-glass behavior resulting from the frustration with a glass transition temperature of 194 K. This sample shows a typical ferromagnetic behavior, with a coercivity of 194.5 Oe within an applied field of ± 2kOe. All three systems have been found to have frustration index in the range 1-25, and effective magnetic moment decreased in the order MgVFeO4 > MgVCrO4 > MgV2O4. While the inclusion of chromium did not alter the bandgap of MgV2O4, iron substitution increased bandgap. The partial replacement of V3+ with Cr3+ and Fe3+ appended catalytic property to the system in terms of oxidative degradation of methylene blue dye. The catalytic efficiency followed the order MgVFeO4 > MgVCrO4 > MgV2O4 matching well with the trend noticed in the porosity, surface area, red-ox ability of Fe3+, Cr3+ and V3+ in these samples. The degradation pathway has been followed by analyzing the intermediates from these experiments by mass spectrometry and a plausible mechanism proposed.

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Aug 2019, accepted on 11 Oct 2019 and first published on 11 Oct 2019


Article type: Paper
DOI: 10.1039/C9DT03468D
Dalton Trans., 2019, Accepted Manuscript

  •   Request permissions

    Implications of including a magnetic ion (Cr3+ and Fe3+) at the vanadium site in geometrically frustrated spinel MgV2O4: Magnetic and Catalytic properties

    R. Nagarajan, V. Shrivastava and V. K. Tripathi, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT03468D

Search articles by author

Spotlight

Advertisements