Synthesis, crystal structure and charge-distribution validation of β-Na4Cu(MoO4)3adopting the alluadite structure-type

Phase formation study of the Na2MoO4–Cs2MoO4–CoMoO4 system resulted in new cesium‐containing alluaudite‐related phases. The solid solution Na4–2x‐yCsyCo1+x(MoO4)3 (0 ≤ x, y ≤ 0.30), based on the alluaudite‐type Na4–2xCo1+x(MoO4)3, and triple molybdate Na10(Cs4‐xNax)Co5(MoO4)12 (0 ≤ x ≤ 0.30) were found, and their structures were solved. In the structure of Na3.21Cs0.37Co1.21(MoO4)3 (a = 13.0917(8) Å, b = 13.5443(8) Å, c = 7.1217(4) Å, space group C2/c, β = 112.331(2), Z = 4), the cesium ions partially substitute the Na+ in the channels running along the c‐axis. The structure of Na10(Cs3.77Na0.23)Co5(MoO4)12 (a = 13.6572(3) Å, b = 11.5063(3) Å, c = 27.9898(5) Å, space group Pbca, Z = 4) was proved to be the aristotype for the pseudo orthorhombic Na25Cs8R5(MoO4)24 (R = Fe, Sc, In). The compounds contain alluaudite‐like layers of MoO4 tetrahedra and pairs of edge‐shared (Co, Na)O6 or (R, Na)O6 and NaO6 octahedra, which are connected by bridging MoO4 tetrahedra to form 3D frameworks differing from the alluaudite type. The frameworks contain channels along the c‐axis filled by Cs+ and Na+ ions. Bond valence sum (BVS) maps show that the alluaudite‐related molybdates can have a 2D sodium‐ion conductivity at elevated temperatures in contrast to the alluaudite‐type cathode material Na2+2xFe2‐x(SO4)3 with a 1D conductivity. The measured ionic conductivity of Na4–2xCo1+x(MoO4)3, Na4–2x‐yCsyCo1+x(MoO4)3, and Na10Cs4Co5(MoO4)12 reaches 10–3–10–2 S cm–1 at 500 °C.

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Thermal expansion, shear deformations and electrical conductivity of alluaudite-group minerals (badalovite and calciojohillerite)

Shablinskii

Mel’nikova

Vergasova

et al. 2021

Phys Chem Minerals

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Synthesis, crystal structure and charge-distribution validation of β-Na₄Cu(MoO₄)₃adopting the alluadite structure-type

Cited by 4 publications

References 25 publications

ChemInform Abstract: Synthesis, Crystal Structure and Charge‐Distribution Validation of β‐Na₄Cu(MoO₄)₃ Adopting the Alluadite Structure‐Type.

ChemInform Abstract: Synthesis, Crystal Structure and Charge‐Distribution Validation of β‐Na₄Cu(MoO₄)₃ Adopting the Alluadite Structure‐Type.

Synthesis, Structure, and Conductivity of Alluaudite‐Related Phases in the Na₂MoO₄–Cs₂MoO₄–CoMoO₄ System

Thermal expansion, shear deformations and electrical conductivity of alluaudite-group minerals (badalovite and calciojohillerite)

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Synthesis, crystal structure and charge-distribution validation of β-Na4Cu(MoO4)3adopting the alluadite structure-type

Cited by 4 publications

References 25 publications

ChemInform Abstract: Synthesis, Crystal Structure and Charge‐Distribution Validation of β‐Na4Cu(MoO4)3 Adopting the Alluadite Structure‐Type.

ChemInform Abstract: Synthesis, Crystal Structure and Charge‐Distribution Validation of β‐Na4Cu(MoO4)3 Adopting the Alluadite Structure‐Type.

Synthesis, Structure, and Conductivity of Alluaudite‐Related Phases in the Na2MoO4–Cs2MoO4–CoMoO4 System

Thermal expansion, shear deformations and electrical conductivity of alluaudite-group minerals (badalovite and calciojohillerite)

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Product

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Synthesis, crystal structure and charge-distribution validation of β-Na₄Cu(MoO₄)₃adopting the alluadite structure-type

ChemInform Abstract: Synthesis, Crystal Structure and Charge‐Distribution Validation of β‐Na₄Cu(MoO₄)₃ Adopting the Alluadite Structure‐Type.

ChemInform Abstract: Synthesis, Crystal Structure and Charge‐Distribution Validation of β‐Na₄Cu(MoO₄)₃ Adopting the Alluadite Structure‐Type.

Synthesis, Structure, and Conductivity of Alluaudite‐Related Phases in the Na₂MoO₄–Cs₂MoO₄–CoMoO₄ System