Crystal structure of the new borate Li3Gd(BO3)2. Comparison with the homologous Na3Ln(BO3)2 (Ln: La,Nd) compounds |
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| Institution: | 1. State Key Laboratory of Material Processing and Die & Mould Technology, Laboratory of Solid State Ionics, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics and Opto-electronic Technology, Dalian University of Technology, Dalian 116024, PR China |
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| Abstract: | The structure of Li3Gd(BO3)2 has been solved by X-ray diffraction study on single crystal. This novel borate crystallizes in the monoclinic system with the P21/c space group (Z=4). The cell parameters are respectively equal to a=8.724(2), b=6.425(2), c=10.095(2) Å and β=116.85(2)°. Refinements of 110 parameters using 2924 independent reflections having I>2σ(I) converged to R1=0.028 (wR2=0.058). The structure of Li3Gd(BO3)2 is made up of double layers of eightfold coordinated Gd atoms parallel to the (bc) plane. They are linked by respectively three- and four-coordinated boron and lithium atoms. The structure is compared to that of the homologous sodium compounds, Na3Ln(BO3)2 (Ln: La, Nd), in which LnO8 polyhedra also form a bi-dimensional array. |
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