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This chapter reports mainly recent synthesis and structural finding obtained on metal orthophosphate salts BaII(MV0.5M’III0.5)(PO4)2 (M = Sb, Nb; M’ = Al, Fe, Cr, Sc, In, Yb), and distorted AII(SbV0.5M’III0.5)(PO4)2 (A: = Sr, Pb; M’ = Fe, Cr, Ga) yavapaiite phosphates. These materials were synthesised by solid-state method using MV2O5/M2’IIIO3 oxides, AIICO3 carbonate and ammonium/di-ammonium hydrogen phosphates NH4H2PO4)/(NH4)2HPO4 in appropriate stochiometric ratios. All obtained structures were refined by the Rietveld method using X-ray powder diffraction. The structural parameters are provided for all the reviewed structures. The ordinaire yavapaiite phases were cristallized in the monoclinic space group C2/m (Z = 2). heir structure is composed of layers in the plane (a, b) and is made up of corner-connected M(M’)O6 octahedra and AO10 polyhedra derived from six PO43− phosphate groups, and from other monodentate PO4 groups. The distorted yavapaiite structures crystallized in monoclinic C2/c space group (Z = 4), with structures-type consisting of PO43− tetrahedra, M(M’)O6 octahedra, and AO10 polyhedra with A atoms coordination considered as 8 + 2. BaTi(1-2x)SbxCrx(PO4)2 (0 ≤ x ≤ 0.5) phases crystallized all in the monoclinic space group C2/m and Z = 2.

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Synthesis and Crystal Chemistry of Phosphates with Ordinary and Low Yavapaiite Structure-Types of Formula AII(MV0.5 M’III0.5)(PO4)2

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  • 发表日期：

    2026年

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  • R. Fakhreddine,
  • F. Tabane,
  • A. Ouasri,
  • A. Zaroual,
  • S. Krimi,
  • A. Aatiq

摘要

This chapter reports mainly recent synthesis and structural finding obtained on metal orthophosphate salts BaII(MV0.5M’III0.5)(PO4)2 (M = Sb, Nb; M’ = Al, Fe, Cr, Sc, In, Yb), and distorted AII(SbV0.5M’III0.5)(PO4)2 (A: = Sr, Pb; M’ = Fe, Cr, Ga) yavapaiite phosphates. These materials were synthesised by solid-state method using MV2O5/M2’IIIO3 oxides, AIICO3 carbonate and ammonium/di-ammonium hydrogen phosphates NH4H2PO4)/(NH4)2HPO4 in appropriate stochiometric ratios. All obtained structures were refined by the Rietveld method using X-ray powder diffraction. The structural parameters are provided for all the reviewed structures. The ordinaire yavapaiite phases were cristallized in the monoclinic space group C2/m (Z = 2). heir structure is composed of layers in the plane (a, b) and is made up of corner-connected M(M’)O6 octahedra and AO10 polyhedra derived from six PO43− phosphate groups, and from other monodentate PO4 groups. The distorted yavapaiite structures crystallized in monoclinic C2/c space group (Z = 4), with structures-type consisting of PO43− tetrahedra, M(M’)O6 octahedra, and AO10 polyhedra with A atoms coordination considered as 8 + 2. BaTi(1-2x)SbxCrx(PO4)2 (0 ≤ x ≤ 0.5) phases crystallized all in the monoclinic space group C2/m and Z = 2.