Synthesis, crystal structure and physical properties of Ce2Ru2Ga3

Мурашова, Е. В.; Shablinskaya, Ksenia; Kurenbaeva, Zhanaphija; Yaroslavtsev, Alexander; Менушенков, А. П.; Chernikov, Roman; Grishina, O. V.; Нестеренко, С. Н.; Seropegin, Yu. D.; Kaczorowski, D.

doi:10.1016/j.intermet.2013.02.002

Cited by 10 publications

(3 citation statements)

References 29 publications

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“…By analogy to other Ceand Ru-bearing intermetallics, one may expect the presence of a broad minimum in χ m -1 (T) above 400 K that would define the characteristic energy scale of valence fluctuations [21] in Ce 2 Ru 2 Al. For the gallides Ce 2 Ru 2 Ga 3 [22] and Ce 4 Ru 3 Ga 3 [23] such a minimum in χ m -1 (T) was observed near 150 K and 250 K, respectively, but for Ce 9 Ru 4 Ga 5 [24] and the aluminides Ce 5 Ru 3 Al 2 [10] and Ce 2 RuAl [14] its position was also estimated above 400 K. Remarkably, in all these materials, the Ce ions occupy more than one crystallographic site and some of them exhibit a stable trivalent state that accompanies the valence fluctuations in a different Ce ions sublattice. This may lead to the appearance of long-range magnetic ordering at low temperatures [14,23,24].…”

Section: Resultsmentioning

confidence: 99%

Crystal structure and unstable valence in a novel intermetallic phase Ce2Ru2Al

Marushina

Kaczorowski

Мурашова

et al. 2015

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

Crystal structure and unstable valence in a novel intermetallic phase Ce2Ru2Al

Marushina

Kaczorowski

Мурашова

et al. 2015

Journal of Alloys and Compounds

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“…Remarkably, in both compounds one of the different Ce atoms is coordinated by its Ru neighbors at a distance of ∼ 2.2 Å and ∼ 2.4 Å, respectively, which is much shorter than the sum of the covalent radii of the Ce and Ru atoms. As discussed in detail in a series of our previous papers on the Ce-Ru-X intermetallics (X = Ge, Ga, Al) [15][16][17][18][19][20][21][22], strong Ce-Ru bonding brings about a significant instability of the electronic 4 f shell, and thus intermediate valence behavior may arise. At the same time, the Ce ions with Ce-Ru distances of regular length remain their trivalent character that promotes localized magnetism with possible magnetic ordering at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Mixed Valence of Ce and Its Consequences on the Magnetic State of Ce9Ru4Ga5: Electronic Structure Studies

2020

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We report on X-ray photoelectron spectroscopy (XPS) and ab initio electronic structure investigations of a novel intermetallic material Ce 9 Ru 4 Ga 5 . The compound crystallizes with a tetragonal unit cell (space group I4 m m ) that contains three inequivalent Ce atoms sites. The Ce 3 d core level XPS spectra indicated an intermediate valence (IV) of selected Ce ions, in line with the previously reported thermodynamic and spectroscopic data. The ab initio calculations revealed that Ce1 ions located at 2 a Wyckoff positions possess stable trivalent configuration, whereas Ce2 ions that occupy 8 d site are intermediate valent. Moreover, for Ce3 ions, located at different 8 d position, a fractional valence was found. The results are discussed in terms of on-site and intersite hybridization effects.

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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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Synthesis, crystal structure and physical properties of Ce2Ru2Ga3

Cited by 10 publications

References 29 publications

Crystal structure and unstable valence in a novel intermetallic phase Ce2Ru2Al

Crystal structure and unstable valence in a novel intermetallic phase Ce2Ru2Al

Mixed Valence of Ce and Its Consequences on the Magnetic State of Ce9Ru4Ga5: Electronic Structure Studies

The modulated structure of intermediate-valent CeCoGa

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