The crystal structure of Li2B3PO8 was determined by X-ray diffraction of a single crystal prepared by slow cooling from 943 K to 873 K. Li2B3PO8 crystallizes in a triclinic cell (space group P![[1 with combining macron]](http://www.rsc.org/images/entities/char_0031_0304.gif)
, Z = 8). The sheets of ∞2[B3PO8]2− formed by the linkage of triangular BO3 and tetrahedral BO4 and PO4 groups stack along the b-axis direction.
