The study of the crystalline phosphates of kosnarite type structure containing different alkali metalsстатья
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Аннотация:The incorporation possibilities of different alkali elements into crystalline phosphates A(1-x)A'(x)Hf(2)(PO(4))(3) (A = Li, Na, K, Rb, Cs) were studied, the formation regions of kosnarite solid solutions were determined. Na(0.5)K(0.5)Hf(2)(PO(4))(3) crystal structure was studied by powder X-ray diffraction, and the distribution of alkali metals in kosnarite structure was found out. The phosphate crystallizes in the space group R (3) over barc, with a=8.7295(1) angstrom, c=23.2023(4) angstrom, V=1531.24(4) angstrom(3), Z=6; R(wp)= 6.15, R(p)=4.43. The concentration region knowledge of the kosnarite phase existence and peculiarities of their phase formation in the A(1-x)A'(x)M(2)(PO(4))(3) (M=Ti, Zr, Hf) systems allow us to choose phosphate matrice compositions suitable for solidification of reprocessing wastes of spent U-Pu nuclear fuels. (C) 2010 Elsevier Inc. All rights reserved.