Structure and Eu2+ luminescence of dibarium magnesium orthoborate

The structure of the mixed alkaline-earth orthoborate Ba2Mg(BO3)2, a buetschliite derivative, has been established with single-crystal X-ray diffraction methods. Crystal data: a = 5.343(2), c = 16.520(3) Å, V = 408.4(2) Å3, Z = 3, space group = R3̄m. A Eu2+-doped powder exhibits a luminescence peak at 608 nm and a Stokes shift of ~ 11,000 cm−1.