Structural phase transition and antiferromagnetic transition of Tb 3 RuO 7

Abstract

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

Phase transitions of Sm₃NbO₇, (Sm₁₋<i>_xLn_x</i>)₃NbO₇ (<i>Ln</i> = Nd, Eu) and Sm₃TaO₇ with fluorite-related structure

“…With increasing temperature, some diffraction lines which could not be indexed with space group C222 1 appear [for example, the diffraction lines show that above the phase transition temperature, they crystallize in the orthorhombic phase with space group Cmcm. 7),9),12),13), 31) We tried to analyze the X-ray diffraction profile measured at 1473 K first with the space group Cmcm. However, the diffraction lines could not be indexed based on the C-centered conditions.…”

Magnetic interactions in praseodymium ruthenate Pr 3 RuO 7 with fluorite-related structure

“…It has been reported that Ln 3 RuO 7 compounds are formed for Ln = La ~ Dy [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. For rare earth smaller than Dy, Ln 3 RuO 7 has not been prepared, i.e., Y 3 RuO 7 has not been obtained.…”

“…Magnetic properties of compounds containing both rare earth and transition metal have attracted a great deal of interest, because they often show anomalous magnetic behavior due to interactions of unpaired 4f electrons and d electrons. Many studies have been performed, due to this unique crystal structure and possible related magnetic properties for Ln 3 MO 7 compounds (M = Mo [1][2][3], Ru [4][5][6][7][8][9][10][11][12][13][14][15][16][17], Re [18][19][20][21], Os [13,[22][23][24], and Ir [25][26][27][28]), especially for the magnetic properties of compounds containing Ru 5+ ion at the M-site because of its largest possible spin (S = 3/2) among the 4d and 5d transition metals. Among many Ln 3 MO 7 compounds, we focus our attention on the magnetic properties of Pr 3 RuO 7 .…”

Synthesis of new fluorite-related rare earth oxides Ln $${\text{Ln}}_{2}^{\prime }$$ Ln 2 ′ MO7 (Ln, Ln′ = rare earths; M = Nb, Sb, Ta), their structures and magnetic properties by calorimetry measurements

“…Another topic for Ln 3 MO 7 compounds is that ruthenium-, iridium-and osmium-containing members of the Ln 3 MO 7 family show structural phase transitions by specific heat and DSC measurements [8][9][10][11][12][13][14][15][16][17].…”

“…Many studies have been performed [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][22][23][24][25][26][27][28][29][30], due to this unique crystal structure and possible related magnetic properties of Ln 3 MO 7 compounds (M = Mo, Ru, Re, Os, Ir), especially for the magnetic properties of compounds containing Ru 5? ion at the M-site because of its largest possible spin (S = 3/2) among the 4d and 5d transition metals.…”