Structure of medium temperature phase β-LaSc₃(BO₃)₄ crystal

Abstract

The compound β-LaSc3(BO3)4 crystallizes in the rhombohedral with space group R32 and cell parameters a=9.819(3), c=7.987(1) Å, Z=3, V=666.5(3) Å3, Dc=3.80 g/cm3, λ(MoKβ)=0.71067 Å, F(000)=708, final R=0.053. RW=0.072 for 512 observed reflection with I≥3σ(I). The La atoms, Sc atoms and B atoms occupy trigonal prisms, octahedra and planar triangle of oxygen, respectively. The isolated LaO6 trigonal prisms alternate along the c-axis with BO3 triangle (B(1)) that are perpendicular to the c-axis. La3+ ions join by means of La-O- Sc(B)-O-La with the distance between La3+ ions being 6.263 Å. This structural characteristic will result in a weaker interaction between Nd3+ ions and a lower fluorescence concentration quenching effect.