Showing papers by "Ali Boukhari published in 2000"
TL;DR: In this article, a packing of diphosphate groups [P2O7]4− and [MO6] octahedra delimiting cavities and tunnels which host sodium cations is described.
36 citations
TL;DR: In this article, synthesis and single-crystal X-ray structural results are reported for three new mixed diphosphates of the family AI2BIII765613(P2O7)2.
Abstract: Syntheses and single-crystal X-ray structural results are reported for three new mixed diphosphates of the family AI
2BII
3(P2O7)2; Ag2Co3(P2O7)2 (I), Ag2Mn3(P2O7)2 (II), and Na2Cd3(P2O7)2 (III) All crystallize in the triclinic system, space group P1 bar: (I) a = 5351(4), b = 6375(4), c = 16532(4) A, α = 8083(6) β = 8145(4), γ = 7287(5)°, V = 5289(6) A3, Z = 2, D
calc = 4649 mg/m3, R/Rw = 00428/00548 for 3949 obs reflns; (II) a = 5432(7), b = 6619(6), c = 1651(3) A, α = 8078(8) β = 8243(9), γ = 7282(7)°, V = 5577(13) A3, Z = 2, D
calc = 4338 mg/m3, R/Rw = 00679/01303 for 2100 obs reflns and (III) a = 567(3), b = 708(4), c = 790(4) A, α = 770(2), β = 825(2), γ = 678(2)°, V = 286(3) A3, Z = 2, D
calc = 4249 mg/m3, R/Rw = 00307/00342 for 1945 obs reflns (I) and (II) are isostructural but (III) is of a different type All three structures are characterized by layers of P2O7 groups alternating with layers of mixed metal atoms Differences are seen in the conglomerate bonding patterns of B atoms and in the irregular geometry of Ag in (I) and (II) compared to the octahedral bonding seen for Na in (III) The differences in structure may be understood in terms of the ratios of the ionic radii of A and B atoms
10 citations
TL;DR: In this paper, a single crystal Na 2 CaP 2 O 7 has been prepared in single crystal form by fusion techniques, and the single crystal structure: a = 5.361(3), b = 7.029 (3), c = 8.743(4)A, α = 69.40(2), β = 89.02(3, γ = 88.78(4), V = 308.5(3)A 3, space group P1 bar, Z = 2, D calc = 2.799 mg/m 3,
Abstract: Na 2 CaP 2 O 7 has been prepared in single crystal form by fusion techniques. The single crystal structure: a = 5.361(3), b = 7.029(3), c = 8.743(4)A, α = 69.40(2), β = 89.02(3), γ = 88.78(4) °, V = 308.5(3)A 3 , space group P1 bar, Z = 2, D calc = 2.799 mg/m 3 , R/R w = 0.0445/0.0554 for 1434 observed reflections (F>4.0σ(F), shows a solid state form similar to that of K 2 SrP 2 O 7 , K 2 MnP 2 O 7 and KaCdP 2 O 7 .