Die Kristallstruktur von Rhodium(III)-chlorid

Bärnighausen, H.; Handa, B.K.

doi:10.1016/0022-5088(64)90103-1

Cited by 36 publications

(24 citation statements)

References 3 publications

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“…But any phenomenological Debye-Einstein fit of the measured heat capacity of α-RuCl3 will be hampered by the magnetic anomaly atlow temperatures, by possible contributions of itinerant Majorana fermions to the heat capacity up to ~ 100 K and finally also by the structural phase transition at higher temperatures. To get an estimate of the phonon background, we measured RhCl3, which crystallizes in the same monoclinic room-temperature structure [45] and with rhodium as direct neighbor of Ru in the periodic table of elements with marginal differences of the atomic masses. Hence, while the mass relation are very similar, of course we cannot exclude significant differences in the crystalline binding forces.…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic evidence of fractionalized excitations in α−RuCl3

et al. 2019

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Fractionalized excitations are of considerable interest in recent condensed-matter physics. Fractionalization of the spin degrees of freedom into localized and itinerant Majorana fermions are predicted for the Kitaev spin liquid, an exactly solvable model with bond-dependent interactions on a two-dimensional honeycomb lattice. As function of temperature, theory predicts a characteristic two-peak structure of the heat capacity as fingerprint of these excitations. Here we report on detailed heat-capacity experiments as function of temperature and magnetic field in high-quality single crystals of α-RuCl 3 and undertook considerable efforts to determine the exact phonon background. We measured single-crystalline RhCl 3 as non-magnetic reference and performed ab-initio calculations of the phonon density of states for both compounds. These ab-initio calculations document that the intrinsic phonon contribution to the heat capacity cannot be obtained by a simple rescaling of the nonmagnetic reference using differences in the atomic masses. Sizable renormalization is required even for non-magnetic RhCl 3 with its minute difference from the title compound. In α-RuCl 3 in zero magnetic field, excess heat capacity exists at temperatures well above the onset of magnetic order. In external magnetic fields far beyond quantum criticality, when long-range magnetic order is fully suppressed, the excess heat capacity exhibits the characteristic two-peak structure. In zero field, the lower peak just appears at temperatures around the onset of magnetic order and seems to be connected with canonical spin degrees of freedom. At higher fields, beyond the critical field, this peak is shifted to 10 K. The high-temperature peak located around 50 K is hardly influenced by external magnetic fields, carries the predicted amount of entropy, R/2 ln2, and may resemble remnants of Kitaev physics.

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Section: Resultsmentioning

confidence: 99%

Thermodynamic evidence of fractionalized excitations in α−RuCl3

et al. 2019

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“…15,31 The quantitative analysis of the amount of atomically dispersed rhodium points to the necessity of careful choice of metal precursor, tuned conditions for applied thermal treatments and designed supports for the attainment of relatively stable atomically dispersed rhodium catalysts. 4,5 Decomposition of rhodium chloride under air occurs from 713 to 773 K. 33 Decomposition of rhodium acetates is reported to be already complete at 650 K 32 with further heating (up to 800 K) causing sintering of the highly dispersed rhodium species; rhodium dispersion decreases with increasing temperature of thermal treatment. The individual rhodium atoms in the samaria-containing catalyst account for about half of the total amount of rhodium in the sample.…”

Section: The Esi †) Similar Values As the Ones Reported Inmentioning

confidence: 99%

“…A common method for the synthesis of supported metal catalysts is wet impregnation of the support with a metal precursor solution. 5 The use of RhCl 3 ÁnH 2 O and [RhCl(C 2 H 4 ) 2 ] 2 also led to varied dispersion over sol-gel derived silica: 6 RhCl 3 ÁnH 2 O resulted in the formation of rhodium nanoparticles and crystallites with an irregular size while [RhCl(C 2 H 4 ) 2 ] 2 resulted in nanoparticles with homogeneous distribution. The dispersion of ruthenium was similar to and independent of the precursor type; only the nature of the oxidic support (alumina, silica and zirconia) was found to influence the dispersion of the metal.…”

Section: Introductionmentioning

confidence: 99%

Atomically dispersed rhodium on a support: the influence of a metal precursor and a support

Duarte¹,

Safonova²,

Krumeich³

et al. 2014

Phys. Chem. Chem. Phys.

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The influence of the support type and the metal precursor on the dispersion of rhodium after calcination and reduction was determined. The combination of electron microscopy and X-ray absorption analysis allowed the quantification of the amount of atomically dispersed rhodium in the samples. Higher amounts of atomically dispersed rhodium atoms are obtained when metal impregnation is performed with a rhodium acetate precursor in comparison to a rhodium chloride precursor over supports of the same composition. The stability of rhodium is improved with the addition of promoters; the co-presence of samaria and ceria in the support and metal impregnation with a rhodium acetate precursor leads to the highest amount of atomically dispersed rhodium remaining after reductive treatment at 773 K.

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“…Nach sonst gleichem Verfahren wurden jeweils 60 mg RhI 3 Å gefunden[17]. Nach sonst gleichem Verfahren wurden jeweils 60 mg RhI 3 Å gefunden[17].…”

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Über RhSCl5- ein hexamerer, molekularer Rhodium(III)-Komplex mit SCl2-Liganden

Herzog

Thiele

2002

Z. anorg. allg. Chem.

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-004RhSCl 5 -A Hexameric, Molecular Rhodium(III) Complex with SCl 2 Ligands.-Red crystals of the title compound are prepared by reaction of Rh or RhI 3 with SCl 2 (autoclave,180 • C, 7 d, yield given in g). As revealed by single crystal XRD, RhSCl 5 crystallizes in the monoclinic space group C2/c with Z = 4. In the crystal structure the Rh atoms are octahedrally coordinated by 5 Cl atoms and one SCl 2 ligand. Six RhCl 5 (SCl 2 ) groups are connected with each other by two common edges of Cl atoms to form hexameric molecules [RhCl 3 (SCl 2 )] 6 which are stacked in columns and form a hexagonal rod package.

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Die Kristallstruktur von Rhodium(III)-chlorid

Cited by 36 publications

References 3 publications

Thermodynamic evidence of fractionalized excitations in α−RuCl3

Thermodynamic evidence of fractionalized excitations in α−RuCl3

Atomically dispersed rhodium on a support: the influence of a metal precursor and a support

Über RhSCl5- ein hexamerer, molekularer Rhodium(III)-Komplex mit SCl2-Liganden

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