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Study of the Crystal Structures of Sodium Magnesium and Sodium Nickel Diphosphates

Identifieur interne : 000B38 ( Main/Exploration ); précédent : 000B37; suivant : 000B39

Study of the Crystal Structures of Sodium Magnesium and Sodium Nickel Diphosphates

Auteurs : Fatima Erragh [Maroc] ; Ali Boukhari [Maroc] ; Francis Abraham [France] ; Brahim Elouadi [France]

Source :

Journal of Solid State Chemistry [ 0022-4596 ] ; 2000.

RBID : ISTEX:3CD9F7018DA07C91F8BC7A90E89ED447D69165B5

Descripteurs français

Pascal (Inist)
- 6166F, Diffraction RX, Etude expérimentale, Magnésium Diphosphate, Mg Na O P, Na Ni O P, Na3,64Mg2,18(P2O7)2, Na3,64Ni2,18(P2O7)2, Nickel Diphosphate, Sodium Diphosphate, Structure cristalline, Structure tunnel.

English descriptors

KwdEn :
- Channel structure, Crystal structure, Experimental study, Magnesium Pyrophosphates, Nickel Pyrophosphates, Sodium Pyrophosphates, XRD.

Abstract

Single-crystal X-ray crystallography studies have shown that diphosphates Na3.64Mg2.18(P2O7)2 and Na3.64Ni2.18(P2O7)2 crystallize with the same structural type and the same space group P1. Their triclinic lattice parameters are equal to a=10.901 (2), b=9.765 (2), c=6.382 (1) Å, α=112.43 (1)°, β=99.64 (1)°, γ=107.53 (1)°, Z=2 and a=10.889 (5), b=9.705 (4), c=6.358 (4) Å, α=112.46 (4)°, β=99.92 (4)°, γ=107.54 (4)°, Z=2, respectively. The structure could be regarded as a packing of diphosphate groups [P2O7]4− and [MO6] octahedra (M=Mg, Ni) delimiting cavities and tunnels which host sodium cations. The tunnels are running along [001]. The structure is characterized by mixed (Na, M) sites with an occupation factor ratio equal to ca. 0.82/0.18. Sodium cations are located in five different sites: two cavities (one penta- and the other octa-coordinated) totally occupied and three octahedral interstices, which are partially filled by Na(3), Na(4), and Na(5) according to the respective occupation factors of 0.15, 0.42, and 0.25 for Na3.64Mg2.18(P2O7)2 and 0.13, 0.40, and 0.29 in the case of Na3.64Ni2.18(P2O7)2.

Url:

https://api.istex.fr/document/3CD9F7018DA07C91F8BC7A90E89ED447D69165B5/fulltext/pdf

DOI: 10.1006/jssc.2000.8651

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">Single-crystal X-ray crystallography studies have shown that diphosphates Na3.64Mg2.18(P2O7)2 and Na3.64Ni2.18(P2O7)2 crystallize with the same structural type and the same space group P1. Their triclinic lattice parameters are equal to a=10.901 (2), b=9.765 (2), c=6.382 (1) Å, α=112.43 (1)°, β=99.64 (1)°, γ=107.53 (1)°, Z=2 and a=10.889 (5), b=9.705 (4), c=6.358 (4) Å, α=112.46 (4)°, β=99.92 (4)°, γ=107.54 (4)°, Z=2, respectively. The structure could be regarded as a packing of diphosphate groups [P2O7]4− and [MO6] octahedra (M=Mg, Ni) delimiting cavities and tunnels which host sodium cations. The tunnels are running along [001]. The structure is characterized by mixed (Na, M) sites with an occupation factor ratio equal to ca. 0.82/0.18. Sodium cations are located in five different sites: two cavities (one penta- and the other octa-coordinated) totally occupied and three octahedral interstices, which are partially filled by Na(3), Na(4), and Na(5) according to the respective occupation factors of 0.15, 0.42, and 0.25 for Na3.64Mg2.18(P2O7)2 and 0.13, 0.40, and 0.29 in the case of Na3.64Ni2.18(P2O7)2.</div>
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Study of the Crystal Structures of Sodium Magnesium and Sodium Nickel Diphosphates

Study of the Crystal Structures of Sodium Magnesium and Sodium Nickel Diphosphates

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

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