The new cerium-rich intermetallic phase Ce13Ru2Sn5: Crystal structure and physical properties

Gribanova, V.; Сорокина, Н. И.; Мурашова, Е. В.; Slabon, Adam; Daou, Ramzy; Maignan, A.; Lebedev, Oleg I.; Грибанов, А. В.

doi:10.1016/j.jallcom.2014.09.225

Cited by 4 publications

(1 citation statement)

References 28 publications

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“…The Ce1 atoms show antiferromagnetic ordering below T N = 2 K. Besides, several complex structures with up to nine crystallographically independent cerium sites (and cerium valences) have been reported, e.g. Ce 16 Ru 8 In 37 [18], Ce 23 Ru 7 T 4 (T = Mg, Zn and Cd) [19], Ce 9 Ru 4 Ga 5 [20,21], Ce 2 Ru 2 Ga 3 [22], or Ce 13 Ru 2 Sn 5 [23]. All these compounds show drastically shortened Ce-Ru distances as a consequence of the intermediate cerium valence.…”

Section: Introductionmentioning

confidence: 99%

The modulated structure of intermediate-valent CeCoGa

Niehaus

Hoffmann

Chevalier

et al. 2015

Zeitschrift Für Kristallographie - Crystalline Materials

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International audienceCeCoGa was synthesized by melting of the elements in an arc-melting furnace as well as in a sealed niobium tube in an induction furnace. A further annealing step improves the purity and crystallinity of the samples significantly. Its structure was refined on the basis of single-crystal X-ray diffractometer data at different temperatures. Already at room temperature CeCoGa crystallizes in a superstructure of the HT-CeCoAl type. This superstructure can be described in the (3+1)D superspace group C2/m(α0γ)00; α=2/3, γ=1/3 with a temperature independent q-vector (Z=4). For the 300 K data (also for 90 K) the commensurate modulated structure could be refined with 1336 F2 values, 56 variables and residuals of wR=0.0348 for the main and wR=0.0605 for the satellites of 1st order [a=1101.7(1), b=436.0(1) and c=482.4(1) pm, β=103.2(1)°]. Furthermore a description in a transformed 3D supercell with the space group C2/m and Z=12 is possible. For the 90 K data this 3D supercell was refined with 1289 F2 values, 56 variables and a residual of wR=0.0409 [a=1618.8(1), b=435.3(1) and c=1094.1(1) pm, β=119.3(1)°]. The relation of the HT-CeCoAl type structure, the (3+1)D modulated and the 3D supercell structure are discussed on the basis of a group-subgroup relation. By thermal analysis and magnetic measurements the phase transition temperature to the HT-CeCoAl type structure is stated slightly above 475 K. Furthermore intermediate cerium valence was identified by the magnetic susceptibility

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