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The title compound  β -Eu(BO 2 ) 3  was synthesized in a high-pressure/high-temperature experiment at 4 GPa and 1473 K. The europium borate crystallizes in the orthorhombic space group  Pnma  (no. 62) with the lattice parameters  a  = 16.071(2),  b  = 7.440(4), and  c  = 12.362(5) Å. The structure is isotypic to the already known  meta -borates  β - RE (BO 2 ) 3  ( RE  = Y, Nd, Sm, Gd, Dy–Lu) and is built up of approximately triangular ribbons of BO 4  tetrahedra. The compound was further characterized by X-ray powder diffraction, vibrational spectroscopy and shows a typical Eu 3+  line emission upon excitation at 448 nm.

β -Eu(BO 2 ) 3 – a new member of the β - RE (BO 2 ) 3 ( RE =Y, Nd, Sm, Gd–Lu) structure family