Study of the Crystal Structures of Sodium Magnesium and Sodium Nickel Diphosphates
Identifieur interne : 000348 ( France/Analysis ); précédent : 000347; suivant : 000349Study 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.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
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:
DOI: 10.1006/jssc.2000.8651
Affiliations:
- France, Maroc
- Hauts-de-France, Nord-Pas-de-Calais, Poitou-Charentes, Rabat-Salé-Kénitra
- La Rochelle, Rabat, Villeneuve d'Ascq Cédex
- Université de La Rochelle
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Links to Exploration step
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<term>Nickel Pyrophosphates</term>
<term>Sodium Pyrophosphates</term>
<term>XRD</term>
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<term>Magnésium Diphosphate</term>
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<term>Na Ni O P</term>
<term>Na3,64Mg2,18(P2O7)2</term>
<term>Na3,64Ni2,18(P2O7)2</term>
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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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