Determination of the crystal and magnetic structure of the DyCrO4-scheelite polymorph by neutron diffraction

6th Meeting of the Spanish Neutron Scattering Association

Santos-García, A.J. Dos^1 ; Climent-Pascual, E.^1 ; Rabie, M.G.^1 ; De Paz, J. Romero^1 ; Amores, J.M. Gallardo^1 ; Khalyavin, D.^2 ; Sáez-Puche, R.^1

Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense de Madrid, Madrid

28040, Spain^1

ISIS Facility, Rutherford Appleton LaboratoryCCLRC, Oxfordshire, Chilton, Didcot

OX11 0QX, United Kingdom^2

关键词: Ambient pressures;    Crystal and magnetic structure;    Neutron diffraction data;    Ordered magnetic moments;    Propagation vector;    Scheelite structure;    Scheelite-type structure;    Structural phase transition;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/549/1/012021/pdf
DOI  :  10.1088/1742-6596/549/1/012021

来源: IOP

【 摘 要 】

Neutron diffraction data of DyCrO4oxide, 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 TN19 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+3and Cr+5respectively.