Abstract
Single crystals of K4CaUSi4O14 have been grown from a eutectic CaF2–KF flux. K4CaUSi4O14 crystallizes in a new structure which exhibits a 49-fold superstructure believed to be due to a modulation of the uranium and silicon polyhedra. We report the sub-cell of the structure which adopts the tetragonal space group Pn2 with lattice parameters a = 9.2862(2) Å, c = 8.3796(4) Å, and V = 722.60(5) Å3. K4CaUSi4O14 is a member of a structural family related to the mineral fresnoite which we describe here. Finally, we report UV-vis absorbance and SHG measurements on the compound, which is non-centrosymmetric.
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