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Abstract
Two new alkali thorium phosphate materials, K3Th2(PO4)3F2 and RbThPO4F2, were isolated by hydrothermal synthesis at 575 °C. These structures were characterized by single crystal X-ray diffraction using a full-matrix least squares method. The K3Th2(PO4)3F2 compound crystallizes in C2/c (No. 15) with a = 15.8179(15) A, b = 9.8172(8) A, c = 9.6472(9) A, β = 121.132(7)°, Z = 4 and R 1 = 0.0329. This structure contains two large open channels possibly suitable for incorporating radioactive cesium isotopes for waste storage. The RbThPO4F2 structure forms in the P2 1 /m (No. 11) space group with a = 6.719(4) A, b = 6.002(3) A, c = 7.431(5) A, β = 113.925(19)°, Z = 2 and R 1 = 0.0359. Unique to this material is a chain of edge sharing thorium with square antiprism coordination environments where fluorine occupies both sites along the edge. Both structures also represent the first occurrences of a fluorinated alkali thorium phosphate material. Two novel fluorinated alkali thorium phosphate structures, K3Th2(PO4)3F2 and RbThPO4F2, were prepared by hydrothermal synthesis as potential radioactive waste storage materials.
Published Version
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