Study of an EuBO-ScBO system and EuSc(BO), EuSc(BO) orthoborates

The EuBO 3 -ScBO 3 system was investigated by solid state synthesis and DSC methods. In this system, a new EuSc(BO 3 ) 2 compound was found. It crystallizes in the R 3&cmb.macr; space group with unit cell parameters of a = 4.8939(1) Å and c = 16.2663(5) Å. Whereas another compound in the system EuSc 3 (BO 3 ) 4 possesses two modifications: a low-temperature α- C 2/ c ( a = 7.687(1) Å, b = 9.810(2) Å, c = 12.021(2) Å, and β = 105.379(4)°) and a high-temperature β- R 32 ( a = 9.7473(1) Å and c = 7.9205(2) Å). The α-EuSc 3 (BO 3 ) 4 crystal was grown with LiBO 2 -LiF flux, and β-EuSc 3 (BO 3 ) 4 was obtained by the solid state synthesis. All of the obtained crystals exhibited typical Eu 3+ luminescence spectra with peaks at 589 nm, 596 nm, 615 nm, 657 nm and 689 nm, which corresponded to the 5 D 0 → 7 F J ( J = 0, 1, 2 and 4) electron transitions. The strongest peak of luminescence was located at 615 nm and corresponded to the 5 D 0 → 7 F 0 transition. Luminescence properties of the compounds in the EuBO 3 -ScBO 3 system were studied.