Magnetic and Calorimetric Studies on One-Dimensional Ln3RuO7(Ln=Pr, Gd)

2014

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Ternary rare-earth antimonates Ln 3 SbO 7 (Ln = rare earths) were prepared, and their structures were determined by X-ray diffraction measurements. They crystallize in an orthorhombic superstructure of cubic fluorite (space group Cmcm for Ln = La, Pr; Ccmm for Ln = Sm -Dy), in which Ln 3+ ions occupy two different crystallographic sites (the 8-coordinated and 7-coordinated). For Ln = Nd, two phases with the Cmcm and Ccmm space groups coexist at room temperature. When the temperature was increased, the Nd 3 SbO 7 compound transformed into a single phase with the space group Cmcm.Through magnetic susceptibility measurements, an antiferromagnetic transition was observed at 3.0 K (Ln = Nd) and 7.8 K (Ln = Tb). Analysis of the magnetic specific heat for Tb 3 SbO 7 indicates that the 8-coordinated Tb ions magnetically orders at 7.8 K, and with furthermore decreasing temperature, the 7-coordinated Tb ions shows antiferromagnetic ordering at 3.0 K.3

Section: Introductionmentioning

confidence: 99%

High-temperature X-ray diffraction measurements of fluorite-related rare earth antimonates Ln3SbO7 (Ln=Nd, Tb) and their magnetic properties

2014

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“…Due to this unique crystal structures and possible related magnetic properties, many studies have been performed, especially for the magnetic properties of compounds containing Ru 5+ ion at the M-site because of its largest possible spin (S = 3/2) [3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of orthorhombic fluorite-related oxides Ln3SbO7 (Ln=rare earths)

Ebisawa

2009

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Ternary rare earth antimonates Ln 3 SbO 7 (Ln = rare earths) were prepared and their structures were determined by x-ray diffraction measurements. They crystallize in an orthorhombic superstructure of cubic fluorite (space group Cmcm for Ln = La, Pr, Nd; C222 1 for Ln = Nd ~ Lu), in which Ln 3+ ions occupy two different crystallographic sites (the 8-coordinated and 7-coordinated sites). Their magnetic properties were characterized by magnetic susceptibility and specific heat measurements from 1.8 to 400 K. The Ln 3 SbO 7 (Ln = Nd, Gd -Ho) compounds show an antiferromagnetic transition at 2.2 ~ 3.2 K. Sm 3 SbO 7 and Eu 3 SbO 7 show van Vleck paramagnetism. Measurements of the specific heat down to 0.4 K for Gd 3 SbO 7 and the analysis of the magnetic specific heat indicate that the antiferromagnetic ordering of the 8-coordinated Gd ions occur at 2.6 K, and the 7-coordinated Gd ions order at a furthermore low temperature.3

“…All the Tb 3+ ions in the Tb 3 RuO 7 occupy in seven-coordinated sites. The ground multiplet 7 F 6 of the Tb 3+ ion should split into many states due to the effect of the crystal field in low 10 symmetry. The estimated S mag value from specific heat measurements 3Rln2 suggests that the degeneracy of the Tb 3+ ions is two.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…These octahedra share corners forming one-dimensional chains which are oriented along the c-axis. The same space group Cmcm has been applied for Ln 3 RuO 7 (Ln = La ~ Gd) [2][3][4][5][6][7][8][9][10][11][12][13], Ln 3 ReO 7 (Ln = Pr, Nd, Sm ~ Tb) [14][15][16][17], Ln 3 OsO 7 (Ln =Pr, Nd, Sm ~ Gd) [11,[18][19][20], Ln 3 TaO 7 (Ln = La ~ Nd) [21][22][23][24][25], Ln 3 IrO 7 (Ln = Pr, Nd, Sm, Eu) earth ion in the Ln 3 MO 7 . For Gd 3 RuO 7 , we performed neutron diffraction measurements and reported that its low-temperature structure is described with space group P2/n [9].…”

Section: Introductionmentioning

confidence: 99%

Structural phase transition and antiferromagnetic transition of Tb 3 RuO 7

2014

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Magnetic properties and structural phase transition of terbium ruthenate Tb 3 RuO 7 are investigated through magnetic susceptibility, specific heat, high-temperature x-ray diffraction and differential scanning calorimetry measurements. The structural phase transition from space group P2 1 nb to Cmcm has been observed at 402 K. Tb 3 RuO 7 shows an antiferromagnetic transition at 17 K. In addition, another magnetic anomaly has been found at 10 K. Analysis of the magnetic specific heat for Tb 3 RuO 7 indicates that the magnetic transitions at 10 and 17 K are due to the magnetic ordering of Tb 3+ and Ru 5+ ions, respectively.3