Vom Ueberchromsäureanhydrid‐triamin. (Nach Versuchen der HHrn. Kutsch und Ohl.)

Riesenfeld, E. H.

doi:10.1002/cber.19050380478

Cited by 18 publications

(18 citation statements)

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“…Peroxochromates with a general formula M 3 CrO 8 , where the counterion is the Cr(O 2 ) 4 – anion and M is an alkali atom, were synthesized long ago, in 1905. These salts were found to possess unusual properties since Cr atoms in the salts are in a Cr(V) state and the salts are expected to be ferroic.…”

Section: Introductionmentioning

confidence: 99%

Transitions from Stable to Metastable States in the Cr₂O_n and Cr₂O_n^– Series, n = 1–14

et al. 2017

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The geometrical and electronic structures of the CrO and CrO clusters are computed using density functional theory with a generalized gradient approximation in the range of 1 ≤ n ≤ 14. Local total spin magnetic moments, polarizabilities, binding energies per atom, and energies of abstraction of O and O are computed for both series along with electron affinities of the neutrals and vertical detachment energies of the anions. In the lowest total energies states of CrO, CrO, CrO, CrO, CrO, CrO, and CrO, total spin magnetic moments of the Cr atoms are quite large and antiferromagnetically coupled. In the rest of the series, at least one of the Cr atoms has no spin-magnetic moment at all. The computed vertical electron-detachment energies of the CrO are in good agreement with experimental values obtained in the 1 ≤ n ≤ 7 range. All neutral CrO possess electron affinities larger than the electron affinities of halogen atoms when n > 6 and are thus superhalogens. It is found that the neutrals and anions are stable with respect to the abstraction of an O atom in the whole range of n considered, whereas both neutrals and anions became unstable toward the loss of O for n > 7. The polarizability per atom decreases sharply when n moves from one to four and then remains nearly constant for larger n values in both series. The largest members in both series, CrO and CrO, possess the geometrical structures of the Cr(O) type by analogy with monochromium Cr(O).

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Section: Introductionmentioning

confidence: 99%

Transitions from Stable to Metastable States in the Cr₂O_n and Cr₂O_n^– Series, n = 1–14

et al. 2017

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“…Chromium oxide ͑CrO 3 ͒ in highly basic aqueous media reacts with hydrogen peroxide ͑H 2 O 2 ͒ to yield salts known as alkali-metal peroxychromates M 3 CrO 8 ͑M =Na + , K + , Rb + , and Cs + ͒. [4][5][6] These alkali-metal peroxychromates provide a route to achieve an S =1/ 2 quantum spin system.…”

Section: Introductionmentioning

confidence: 99%

“…Both oxygen atoms of ͑O 2 ͒ 2− are bonded to the Cr ion, albeit one of the O's is slightly closer ͑1.89 Å͒ to the Cr ion than the other O ion ͑1.94 Å͒. The CrO 8 3− ion can thus be thought of as a chromate ion ͑CrO 4 2− ͒, in which the ͑O͒ 2− ions are replaced by ͑O 2 ͒ 2− ions. The structure is held together by these CrO 8 3− anions and three monovalent alkalimetal cations that balance the charge in a three-dimensional orthorhombic lattice, as illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

Magnetic transitions and spin dynamics in the3d1systemK2NaCrO8investigated by magnet

et al. 2008

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We report pulsed magnetization and 23 Na NMR studies of a quantum phase transition and its associated spin dynamics in a 3d 1 system, using the alkali-metal peroxychromate K 2 NaCrO 8 . This is an example of a Cr 5+ -based S =1/ 2 and I ϳ 0 material with a clearly defined T N = 1.7 K in zero applied field ͑H͒. Its magnetization ͑M͒ shows a nonlinear increase with H, in contrast to a simple three-dimensional antiferromagnet, and saturates at H C = 7.4 T. This easily accessible H C allows for a detailed study by 23 Na NMR of the magneticfield-induced quantum phase transition from the antiferromagnetically ordered to a ferromagnetically polarized phase. The critical exponent of M͑T͒ϳ͑1−T / T N ͒ ␤ is 0.44Ϯ 0.05 at H = 5 T but shows a definitive increase to 0.53Ϯ 0.05 at 6.8 T, close to H C . This suggests that while the magnetic behavior of K 2 NaCrO 8 is largely describable by a mean-field theory, the field dependence of ␤ remains unexplained.

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“…1,2,3,4,5,6,7,8,9,10,11 The purpose of the present work was to consider the curious case of the pentavalent chromium cation, Cr 5+ , an S = 1/2 (3d 1 ) ion that is not a common choice for condensed matter research. 12,13,14,15,16,17,18,19,20 Specifically, the alkali-metal peroxychromate K 2 NaCrO 8 crystallizes with orthorhombic symmetry (space group P bcm) with the lattice parameters a = 8.5883 Å, b = 7.9825 Å, and c = 9.2432 Å at 173 K. 14 The Cr 5+ ion is bonded to four peroxy (O 2 ) 2− ligands in a dodecahedral geometry, and the ions form the three dimensional network shown in Fig. 1.…”

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“…Single crystals of K 2 NaCrO 8 were prepared by modification of the method of Riesenfeld. 12 The synthesis involves the reduction of Cr 6+ by 30% H 2 O 2 at 5 • C in the 1:1 molar mixture of aqueous NaOH and KOH. Specific heat and magnetocaloric data were collected on single crystals with H applied along the c-axis.…”

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confidence: 99%

Magnetic field induced quantum phase transition of the $S = 1/2$ antiferromagnet $K_2NaCrO_8$

Nellutla,

Pati,

et al. 2009

Preprint

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The magnetic properties of alkali-metal peroxychromate K2NaCrO8 are governed by the S = 1/2 pentavalent chromium cation, Cr 5+ . Specific heat, magnetocalorimetry, ac magnetic susceptibility, torque magnetometry, and inelastic neutron scattering data have been acquired over a wide range of temperature, down to 60 mK, and magnetic field, up to 18 T. The magnetic interactions are quasitwo-dimensional prior to long-range ordering, where TN = 1.66 K in H = 0. In the T → 0 limit, the magnetic field tuned antiferromagnetic-ferromagnetic phase transition suggests a critical field Hc = 7.270 T and a critical exponent α = 0.481 ± 0.004. The neutron data indicate the magnetic interactions may extend over intra-planar nearest-neighbors and inter-planar next-nearest-neighbor spins.

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Vom Ueberchromsäureanhydrid‐triamin. (Nach Versuchen der HHrn. Kutsch und Ohl.)

Cited by 18 publications

References 1 publication

Transitions from Stable to Metastable States in the Cr₂O_n and Cr₂O_n^– Series, n = 1–14

Transitions from Stable to Metastable States in the Cr₂O_n and Cr₂O_n^– Series, n = 1–14

Magnetic transitions and spin dynamics in the3d1systemK2NaCrO8investigated by magnet

Magnetic field induced quantum phase transition of the $S = 1/2$ antiferromagnet $K_2NaCrO_8$

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Vom Ueberchromsäureanhydrid‐triamin. (Nach Versuchen der HHrn. Kutsch und Ohl.)

Cited by 18 publications

References 1 publication

Transitions from Stable to Metastable States in the Cr2On and Cr2On– Series, n = 1–14

Transitions from Stable to Metastable States in the Cr2On and Cr2On– Series, n = 1–14

Magnetic transitions and spin dynamics in the3d1systemK2NaCrO8investigated by magnet

Magnetic field induced quantum phase transition of the $S = 1/2$ antiferromagnet $K_2NaCrO_8$

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Transitions from Stable to Metastable States in the Cr₂O_n and Cr₂O_n^– Series, n = 1–14

Transitions from Stable to Metastable States in the Cr₂O_n and Cr₂O_n^– Series, n = 1–14