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During past years, a number of reports have been published on synthesis oftetragonal allotrope of boron, t-B52 phase. However, no unambiguouscharacterization of the crystal structure has been performed to the presenttime, while remarkable variation of the a/c lattice-parameter ratio raisesstrong doubts about its uniqueness. Here the Rietveld refinement of the crystalstructure of the high pressure - high temperature boron phase synthesized by adirect solid-state transformation of rhombohedral beta-B106 at 20 GPa and 2500K has been reported for the first time. Although this boron allotrope belongsto the t-B52 type, its structure can be considered as pseudo-cubic with the a/cratio of sqr(2).

Crystal structure of dense pseudo-cubic boron allotrope, pc-B52, by powder X-ray diffraction