Synthesis, crystal structure and optical properties of BiMgVO5

The new vanadate BiMgVO5 has been prepared and its structure has been determined by single crystal X-ray diffraction: space group P2(l)/n, a = 7.542(6) Angstrom, b = 1 1.615(5) Angstrom, c = 5.305(3) Angstrom, beta = 107.38(5)(c), wR(2) = 0.0447, R = 0.0255. The structure consists of [Mg2O10] and [Bi2O10] dimers sharing their corners with [VO4] tetrahedra. The ranges of bond lengths are 2.129-2.814 Angstrom for Bi-O; 2.035-2.167 Angstrom for Mg-O and 1.684-1.745 Angstrom for V-O. V-O bond lengths determined from Raman band wavenumbers are between 1.679 and 1.747 Angstrom. An emission band overlapping the entire visible region with a maximum around 650 nm is observed. (C) 2004 Elsevier Inc. All rights reserved.