The system Cs2−xRbxSnCu3F12 exhibits several different distorted variants of the kagome lattice, which are probed in detail by powder diffraction methods.

Abstract:Two new members of the A2B′Cu3F12 family of kagome-related materials have been prepared, in order to further understand the crystal-chemical relationships, phase transitions and magnetic behaviour within this family of potentially frustrated S = ½ two-dimensional quantum magnets. Cs2TiCu3F12 adopts a crystal structure with the ideal kagome lattice topology (space group R3 ̅ m) at ambient temperature. Diffraction studies reveal different symmetry-lowering structural phase transitions in single crystal and polycrystalline forms at sub-ambient temperatures, with the single crystal form retaining rhombohedral symmetry OPEN ACCESSCrystals 2015, 5 227 and the powder form being monoclinic. In both cases, long-range antiferromagnetic order occurs in the region 16-20 K. Rb2TiCu3F12 adopts a distorted triclinic structure even at ambient temperatures.

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