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A detailed diffraction study of Ca10Cr7O28 is presented which addssignificant new insights into the structural and magnetic properties of thiscompound. A new crystal structure type was used where the a and b axes aredoubled compared to previous models providing a more plausible structure whereall crystallographic sites are fully occupied. The presence of two differentvalences of chromium was verified and the locations of the magnetic Cr5+ andnon-magnetic Cr6+ ions were identified. The Cr5+ ions have spin-1/2 and formdistorted kagome bilayers which are stacked in an ABC arrangement along the caxis. These results lay the foundation for understanding of the quantum spinliquid behavior in Ca10Cr7O28 which has recently been reported in [C. Balz etal., Nature Physics, 12, 942 (2016)].

Crystal growth, structure and magnetic properties of Ca10Cr7O28