Abstract
Neutron diffraction data of DyCrO4 oxide, prepared at 4 GPa and 833 K from the ambient pressure zircon-type, reveal that crystallize with the scheelite-type structure, space group I41/a. Accompanying this structural phase transition induced by pressure the magnetic properties change dramatically from ferromagnetism in the case of zircon to antiferromagnetism for the scheelite polymorph with a TN = 19 K. The analysis of the neutron diffraction data obtained at 1.2 K has been used to determine the magnetic structure of this DyCrO4-scheelite oxide which can be described with a k = [0, 0, 0] as propagation vector, where the Dy and Cr moments are lying in the ab-plane of the scheelite structure. The ordered magnetic moments are 10 μB and 1μB for Dy+3 and Cr+5 respectively.
Highlights
Phase transitions induced by pressure have been studied for the zircon mineral ZrSiO4 and the analogous zircon-types of RXO4 (X= As and V) which transform the tetragonal space group I 41/amd into a scheelite-type structure, space group I 41/a
We aim to study the scheelite-DyCrO4 oxide through investigating the structural and magnetic properties
Structural characterization The structure of the DyCrO4 compound obtained after treating the DyCrO4-zircon polymorph at 4 GPa and 833 K has been refined from the X-ray and neutron diffraction data using the Rietveld method with the Fullprof program
Summary
Phase transitions induced by pressure have been studied for the zircon mineral ZrSiO4 and the analogous zircon-types of RXO4 (X= As and V) which transform the tetragonal space group I 41/amd into a scheelite-type structure, space group I 41/a. We aim to study the scheelite-DyCrO4 oxide through investigating the structural and magnetic properties.
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