Study of an EuBO3-ScBO3 system and EuSc3(BO3)4, EuSc(BO3)2 orthoborates.

The EuBO3 – ScBO3 system was investigated by solid state synthesis and DSC methods. In this system a new EuSc(BO3)2 compound was found. It crystallizes in R3 @#x0305; space group with unit cell parameters a=4.8939(1)A, c=16.2663(5)A. While another compound in this system EuSc3(BO3)4 has two modifications: low temperature α-C2/c (a=7.687(1) A, b=9.810(2) A, c= 12.021(2) A, β=105.379(4)o) and high temperature β-R32 (a=9.7473(1)A, c=7.9205(2) A). α- EuSc3(BO3)4 crystal was grown with LiBO2-LiF flux and β - EuSc3(BO3)4 was obtained by solid state synthesis. All obtained crystals have typical Eu3+ luminescence spectra with peaks at 589, 596, 615, 657 and 689 nm corresponding 5D0 → 7FJ (J = 0, 1, 2 and 4) electron transitions. The strongest peak of luminescence is located at 615 nm and corresponds to the 5D0 → 7F0 transition.