Magnetic structure of iron borate DyFe₃(BO₃)₄: A neutron diffraction study

Abstract

View the article online for updates and enhancements. Related contentMagnetic structure in iron borates RFe3(BO3)4 (R = Er, Pr): a neutron diffraction andmagnetization study C Ritter, A Vorotynov, A Pankrats et al. Abstract. Neutron diffraction measurements were performed on the iron borate DyFe 3 (BO 3 ) 4 to investigate details of the crystallographic structure, the low temperature magnetic structure and its magnetic properties. DyFe 3 (BO 3 ) 4 adopts at room temperature the P3 1 21 symmetry and becomes antiferromagnetic below T N = 39 K. Both, the rare earth and the iron sublattice, follow the same magnetic propagation vector = [0, 0, ½] which leads to a doubling of the crystallographic unit cell in the c-direction. The easy axis anisotropy of the rare earth determines the moment orientation to be mainly along c. No spin reorientation is found between T N and 1.5 K, however, a small anomaly in the thermal dependence of the unit cell aparameter is found at about 27 K which could be connected to repopulation of low lying Kramers doublets of Dy 3+. The magnetic moment value of the Fe-moment is at 1.5 K with Fe = 4.5 B only slightly smaller than expected for an S = 5/2 ion while the Dy moment is strongly reduced and amounts only to Dy = 6.4 B .

Crystal structure and luminescence properties of self-activated phosphor CsDyP 2 O 7

“…Dy atom in the structure are coordinated by six O atoms to form DyO 6 distorted octahedra with the DyÀ ÀO bond distances ranging from 2.207(3) Ǻ to 2.284(3) Ǻ and OÀ ÀDyÀ ÀO bond angles ranging from 80.58 (12) to 99.67 (12) . The coordination mode of Dy 3+ ions can be comparable with other reported Dy 3+ oxides [26,27]. Results of bond-valence calculations indicate that Cs, Dy and P atoms are in reasonable oxidation states of +1, +3 and +5.…”

Quadrupole moments in chiral materialDyFe3(BO3)4observed by resonant x-ray diffraction

“…However, the contribution is possibly negligible as is discussed later. This compound has a first-order structural phase transition at T S ≈ 285 K, 19,20 where the right-handed and left-handed structure in the space group R32 turn into the space groups P 3 1 21 (#152) and P 3 2 21 (#154), respectively on decreasing temperature. In these enantiomorphic space-group pair P 3 1 21 and P 3 2 21, the stacking chain of the Dy 3+ ions forms in a right-handed or a left-handed screw along the c axis, respectively.…”

“…In the low temperatures, this compound has an additional phase transition at T N = 38 K where both of Fe and Dy magnetic moments shows an antiferromagnetic (AF) order. 19 In the AF ordered phase, DyFe 3 (BO 3 ) 4 exhibits a magnetoelectric effect accompanied by a spin flop.…”

Magnetic resonances of multiferroic TbFe3(BO3)4

“…[31]) and R=Dy (Ref. [32]), in TbFe 3 (BO 3 ) 4 the easy-axis anisotropy of the rare-earth ion is transmitted to the antiferromagnetic S Fe = 5 2 iron system. Consequently, TbFe 3 (BO 3 ) 4 shows a collinear antiferromagnetic order below T N = 40 K with all spins lying along the c axis.…”