Synthesis and crystal structure of a new strontium borate, Sr₂B₁₆O₂₆

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• 作者：Zhi-Hua Tang ; Xuean Chen ; Ming Li
• 关键词：Sr₂B₁₆O₂₆ ; Borate ; Synthesis ; Crystal structure
• 刊名：Solid State Sciences
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：10
• 期：7
• 页码：894-900
• 全文大小：420 K

文摘

A new strontium borate, Sr₂B₁₆O₂₆, has been prepared by solid-state reactions at temperature below 750 °C. The single-crystal X-ray structural analysis showed that Sr₂B₁₆O₂₆ crystallizes in the monoclinic space group P2₁/c with a = 8.408(1) Å, b = 16.672(2) Å, c = 13.901(2) Å, β = 106.33(1)°, and Z = 4. Its crystal structure consists of a 3D network of the complex borate anion [B₁₆O₂₀O_12/2]⁴⁻, formed by 12 BO₃ triangles and 4 BO₄ tetrahedra, which can be viewed as 3 linked [B₃O₃O_4/2]⁻ triborate groups bonded to 1 pentaborate [B₅O₆O_4/2]⁻ group and 2 BO₃ triangles; this leads to a Fundamental Building Block (FBB) with the shorthand notation 16: ∞³[3 × (3:2Δ + T) + (5:4Δ + T) + 2Δ]. The 3D network affords intersecting open channels running parallel to the crystallographic a and c axes, where Sr²⁺ cations reside. The IR spectrum further confirms the presence of both BO₃ and BO₄ groups.