Abstract
Very small colorless crystals of La26(BO3)8O27were grown from La2O3and H3BO3. The composition found by the structure determination corresponds to La3BO6with a slight excess of La2O3. La26(BO3)8O27crystallizes in the monoclinic space groupP21/cwith the lattice constantsa= 692.0(1) pm,b= 1292.3(1) pm,c= 1457.1(1) pm, and β = 99.41(1)°. Its structure consists of fluorite slabs in which the lanthanum atoms have a cubic coordination and lanthanum atoms in a square antiprismatic coordination. This square antiprismatic polyhedra are connected by the borate groups.
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