Showing papers by "Ali Boukhari published in 1994"
TL;DR: In this paper, a single crystal X-ray analysis of powder samples of Zn 2− x M x P 2 O 7 (M = Mn, Cu; x = 0-2) shows that substitution of small amounts of Cu or Mn into low temperature or α-Zn 2 P 2O 7 stabilizes a solid form isostructural with β-zn 2P 2 O7, the high temperature form.
13 citations
7 citations
Journal Article•
TL;DR: The structure of the title compound was solved by single crystal X-ray diffraction as mentioned in this paper, and the structure has been refined from 2979 independent reflections to R=0.031 (R w = 0.039).
7 citations
TL;DR: The domains of the Cd2-xCuxP2O7, O ≤ x ≤ 2, have been established by powder diffraction methods as discussed by the authors, and two solid solutions have been found near Cd 2P 2O7 (0 ≤ x ≥ 0.40) and Cu 2P2P 2 O7 (1.60 ≤ x > 0.30) using single crystal X-ray diffraction.
4 citations
TL;DR: Powder diffraction analysis of materials of the binary mixture Sr2P2O7-Pb2P 2O7 reveals the existence of two solid solutions: A, 0.2 ⩽x⩽ 1.25, isotypical to α-Ca2P1O7 but similar to α -Sr2P3O7; B, 1.5 x 2.34Pb0.
3 citations
2 citations
2 citations
01 Jan 1994
TL;DR: In this paper, a packing of PO 4 and MnO 6 polyhedra surrounding tunnels (parallel to the b axis) which contain the K + ions are found at the comers of planar networks of hexagons parallel to the crystallographic (100) plane.
Abstract: Crystalline K 2 MnP 2 O 7 : monoclinic, P2 1 /n, a=12.649(6), b=9.571(3) A β=104.45(3) o , Z=4, λMoK α =0.71069 A, R/R w =4.1/5.4%, 869 obs. refl., shows a packing of PO 4 and MnO 6 polyhedra surrounding tunnels (parallel to the b axis) which contain the K + ions. Mn 2+ ions are found at the comers of planar networks of hexagons parallel to the crystallographic (100) plane. Magnetic measurements on powder (2-300 K) show a maximum χ M at 2.6 K which could be associated with three-dimensional magnetic order
2 citations
TL;DR: In this article, a packing of PO 4 and MnO 6 polyhedra surrounding tunnels (parallel to the b axis) which contain the K + ions are found at the comers of planar networks of hexagons parallel to the crystallographic (100) plane.
Abstract: Crystalline K 2 MnP 2 O 7 : monoclinic, P2 1 /n, a=12.649(6), b=9.571(3) A β=104.45(3) o , Z=4, λMoK α =0.71069 A, R/R w =4.1/5.4%, 869 obs. refl., shows a packing of PO 4 and MnO 6 polyhedra surrounding tunnels (parallel to the b axis) which contain the K + ions. Mn 2+ ions are found at the comers of planar networks of hexagons parallel to the crystallographic (100) plane. Magnetic measurements on powder (2-300 K) show a maximum χ M at 2.6 K which could be associated with three-dimensional magnetic order
1 citations
TL;DR: The structure of the title compound was solved by single crystal X-ray diffraction as discussed by the authors, and the structure has been refined from 2979 independent reflections to R=0.031 (R w = 0.039).
Abstract: The structure of the title compound was solved by single crystal X-ray diffraction. It crystallizes in the monoclinic system with the space group P2 1 /n. The cell parameters are a=5.312, b=8.789, c=16.067A, β=90.72°, Z=4. The structure has been refined from 2979 independent reflections to R=0.031 (R w =0.039). The three-dimensional framework could be described from corner and edge-sharing NiO 6 octahedra and PO 4 tetrahedra creating two types of tunnels where are located the barium ions. Magnetic thermal susceptibility has been described in terms of antiferromagnetic isotropic interactions in dimers of Ni 2+ (S=1)