Abstract
Lead iron phosphate Pb 3Fe 2(PO 4) 4 has been synthesized by solid state method and characterized by X-ray powder and electron diffraction, differential scanning calorimetry, Mössbauer and infrared spectroscopy. A structural model for Pb 3Fe 2(PO 4) 4 is proposed and is refined by the Rietveld method. The compound crystallizes in the monoclinic space group P 2 1 / c with a = 9.0065 ( 6 ) Å , b = 9.0574 ( 6 ) Å , c = 9.3057 ( 6 ) Å , β = 116.880 ( 4 ) ° , V = 677.10 ( 8 ) Å 3 , Z = 2 , R wp = 3.52 % , R p = 2.66 % . It exhibits a structure with a three-dimensional open framework. The 3D framework is formed by PO 4 tetrahedra and FeO 6 octahedra connected via common vertices. ¾ of cavities in the framework are occupied by lead and ¼ are vacant.
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