Abstract
Yttrium borate Y17.33(BO3)4(B2O5)2O16, known as Y3BO6previously, was prepared from stoichiometric starting materials of H3BO3and Y2O3by a solid-state reaction at high temperatures. Y17.33(BO3)4(B2O5)2O16crystallizes in the monoclinic space groupCmwith the lattice constantsa=1816.62(3),b=365.16(1),c=1397.75(3) pm, andβ=119.75(2)°. The structure of Y17.33(BO3)4(B2O5)2O16was determined using the direct methods applied to X-ray powder diffraction data and consists of BO3−3and B2O4−5borate groups and seven- and eight-coordinated yttrium atoms. The composition obtained from the structure determination corresponds to Y3BO6with a slight excess of B2O3. The luminescent properties of the Eu3+doped Y17.33(BO3)4(B2O5)2O16materials were studied and the Eu3+emission appears as superimposed bands with a high self-quenching concentration.
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