Structure and Luminescent Properties of Y17.33(BO3)4(B2O5)2O16

Abstract Yttrium borate Y 17.33 (BO 3 ) 4 (B 2 O 5 ) 2 O 16 , known as Y 3 BO 6 previously, was prepared from stoichiometric starting materials of H 3 BO 3 and Y 2 O 3 by a solid-state reaction at high temperatures. Y 17.33 (BO 3 ) 4 (B 2 O 5 ) 2 O 16 crystallizes in the monoclinic space group Cm with the lattice constants a =1816.62(3), b =365.16(1), c =1397.75(3) pm, and β =119.75(2)°. The structure of Y 17.33 (BO 3 ) 4 (B 2 O 5 ) 2 O 16 was determined using the direct methods applied to X-ray powder diffraction data and consists of BO 3− 3 and B 2 O 4− 5 borate groups and seven- and eight-coordinated yttrium atoms. The composition obtained from the structure determination corresponds to Y 3 BO 6 with a slight excess of B 2 O 3 . The luminescent properties of the Eu 3+ doped Y 17.33 (BO 3 ) 4 (B 2 O 5 ) 2 O 16 materials were studied and the Eu 3+ emission appears as superimposed bands with a high self-quenching concentration.