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• W2953244511 endingPage "2003" @default.
• W2953244511 startingPage "1995" @default.
• W2953244511 abstract "Polycrystalline samples of iron and rare earth germanates, RFeGe2O7 (R = Y, Pr, Dy, Tm, and Yb), have been prepared. Depending on the size of R, they present two different monoclinic crystal structures, described either in space group P21/c (no. 14) for R = Pr or in P21/m (no. 11) for the smaller rare earths R = Y, Dy, Tm, and Yb. The results of crystal structure refinements from room-temperature high-resolution neutron powder diffraction (NPD) data are given. Magnetization measurements between 350 and 1.6 K reveal the existence of one maximum, at 3 or 38 K for the praseodymium or yttrium germanate, respectively, and two separate anomalies for the remaining materials, which appear at T1 and T2 (T2 < T1), where T1 ≈ 40 K and T2 = 24, 6, and 5 K, for R = Dy, Tm, and Yb, respectively, indicating transitions to antiferromagnetically (AF) ordered states. Judging from low-temperature NPD data, three-dimensional (3D) AF ordering is established for all compounds, with simultaneous ordering of the R3+ and (or) Fe3+ (R = Y) sublattices, at 3 K in PrFeGe2O7, 38 K in YFeGe2O7, and at TN = T1 for the remaining compounds. The ordered magnetic structure of PrFeGe2O7 can be described in terms of the propagation vector k = [1/2, 1/2, 0] and a model that consists of ferromagnetic coupling of the magnetic moments of Fe3+ and Pr3+ along the −FeO5−PrO9−FeO5− chains in the c direction, whereas along the two other axes, the moments show AF coupling. For the R = Y, Dy, Tm, and Yb compounds, the propagation vector of the magnetic structures is k = [0, 0, 0]. In each case, the magnetic structure consists of a ferromagnetic arrangement of all R3+ and (or) Fe3+ (R = Y) magnetic moments within one ac plane, whereas the corresponding moments in up and down adjacent planes are oppositely aligned, leading to 3D AF coupling along the b direction." @default.
• W2953244511 created "2019-06-27" @default.
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• W2953244511 date "2002-04-09" @default.
• W2953244511 modified "2023-10-01" @default.
• W2953244511 title "Crystal Structure and Low-Temperature Magnetic Ordering in Rare Earth Iron Germanates RFeGe₂O₇, R = Y, Pr, Dy, Tm, and Yb" @default.
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• W2953244511 doi "https://doi.org/10.1021/cm0111332" @default.
• W2953244511 hasPublicationYear "2002" @default.
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