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Structure, infrared and Raman spectroscopic studies of newly synthetic AII(SbV0.50FeIII0.50)(PO4)2 (A = Ba, Sr, Pb) phosphates with yavapaiite structure

Abstract : The synthesis and structural study of three new AII(SbV0.5FeIII0.5)(PO4)2 (Adouble bond; length as m-dashBa, Sr, Pb) phosphates belonging to the Asingle bond-Sbsingle bond-Fesingle bond-Psingle bond-O system were reported here for the first time. Structures of [Ba], [Sr] and [Pb] compounds, obtained by solid state reaction in air atmosphere, were determined at room temperature from X-ray powder diffraction using the Rietveld method. BaII(SbV0.5FeIII0.5)(PO4)2 [Ba] features the yavapaiite-type structure, with space group C2/m, Z = 2 and a = 8.1568(4) Å; b = 5.1996(3) Å c = 7.8290(4) Å; β = 94.53(1)°. AII(SbV0.5FeIII0.5)(PO4)2 (Adouble bond; length as m-dashSr, Pb) compounds have a distorted yavapaiite structure with space group C2/c, Z = 4 and a = 16.5215(2) Å; b = 5.1891(1) Å c = 8.0489(1) Å; β = 115.70(1)° for [Sr]; a = 16.6925(2) Å; b = 5.1832(1) Å c = 8.1215(1) Å; β = 115.03(1)° for [Pb]. Raman and Infrared spectroscopic study was used to obtain further structural information about the nature of bonding in selected compositions.rtain.
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Abderrahim Aatiq, My Rachid Tigha, Rachid Fakhreddine, Damien Bregiroux, Gilles Wallez. Structure, infrared and Raman spectroscopic studies of newly synthetic AII(SbV0.50FeIII0.50)(PO4)2 (A = Ba, Sr, Pb) phosphates with yavapaiite structure. Solid State Sciences, Elsevier, 2016, 58, pp.44-54. ⟨10.1016/j.solidstatesciences.2016.05.009⟩. ⟨hal-01324916⟩

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