Abstract
The syntheses of the three forms of bismuth phosphate have been optimized, and the resulting single phases have been characterized by thermal analysis, infrared spectroscopy, and powder X-ray diffraction. Two phases may be obtained at room temperature, one trigonal (slightly hydrated) and another monoclinic with a monazite-type structure. The crystal structure of the trigonal phase, (stoichiometry BiPO 4 -0.67H 2 O, space group P3 i 21; a=6.9885(2) A, c=6.4867(2) A, Z=3; R WP =5.6%, R F =3.6%) has been refined by the Rietveld method. The structure contains channels that run parallel to the c axis where the water molecules are located
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