Two Hydrous Divalent-Metal Diarsenates

Wu, Che; Chen, T. C.; Wang, S. L.

doi:10.1107/s0108270195016350

Cited by 5 publications

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“…This is in contrast to the known magnesium compositional analogue, Mg 2 As 2 O 7 •2H 2 O, which dehydrates to form Mg 2 As 2 O 7 . 22 The material contains chains of Fe 2+ ions, making it a d 6 system. A v(T) plot (Fig.…”

Section: Resultsmentioning

confidence: 99%

Iron arsenate frameworks

et al. 2007

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Six new iron arsenate framework structures, Fe(2)As(2)O(7) x 2H(2)O, [Fe(6)As(8)O(32)H(4)](2-)(1,4-butanediamininium(2+)) x 2H(2)O, [Fe(4)As(6)O(22)H(2)](2-)(piperazinium(2+)), [Fe(5)As(5)O(24)H(4)](2-)(piperazinium(2+)) x 2H(2)O, [Fe(6)As(7)O(31)H(5)](2-)(dabco(2+)) and LiFeAsO(4)OH have been synthesised under hydrothermal conditions. Incorporation of the amine cation templates leads to more open framework geometries and, in contrast to iron phosphates which have topologies based on PO(4) tetrahedra, the iron arsenate structures typically contain protonated As(O,OH)(4) units. The magnetic properties of the iron arsenates studied show Curie-Weiss behaviours with maxima in the chi(T) vs.T plots in the range 10-50 K.

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Section: Resultsmentioning

confidence: 99%

Iron arsenate frameworks

et al. 2007

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ChemInform Abstract: Two Hydrous Divalent‐Metal Diarsenates.

Chen

Wang

1996

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Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co²⁺ Chains

et al. 2019

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We have investigated two original hydrated cobalt arsenates based on Co 2+ octahedral edgesharing chains. Their different magnetocrystalline anisotropies induce different types of metamagnetic transition, spin-flop versus spin-flip. In both compounds, a strong local anisotropy (Ising spins) is favored by the spin-orbit coupling present in the CoO6 octahedra while ferromagnetic (FM) exchanges predominate in the chains. Co2(As2O7), 2H2O (1) orders antiferromagnetically below TN = 6.7 K. The magnetic structure is a non-collinear antiferromagnetic spin arrangement along the zigzag chains with DFT calculations imply frustrated chains and weakened anisotropy. A metamagnetic transition suggests a spin-flop process above 0H = 3.2 T. On the contrary, BaCo2As2O8.2H2O (2) linear chains are arranged in disconnected layers, with only inter-chain ferromagnetic exchanges and therefore increasing its magnetocrystalline anisotropy. The magnetic structure is collinear with a magnetic easy axis that allows a spin-flop to a sharp spin-flip transition below TN= 15.1 K and above 0H = 6.2 T.

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Two Hydrous Divalent-Metal Diarsenates

Cited by 5 publications

References 1 publication

Iron arsenate frameworks

Iron arsenate frameworks

ChemInform Abstract: Two Hydrous Divalent‐Metal Diarsenates.

Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co²⁺ Chains

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Two Hydrous Divalent-Metal Diarsenates

Cited by 5 publications

References 1 publication

Iron arsenate frameworks

Iron arsenate frameworks

ChemInform Abstract: Two Hydrous Divalent‐Metal Diarsenates.

Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co2+ Chains

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Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co²⁺ Chains