Two new yttrium sulfate tellurites, namely, Y₃(TeO₃)₂(SO₄)₂(OH)(H₂O) and Y₂(Te₄O₁₀)(SO₄), were achieved in our exploration of new sulfate tellurites, with a large birefringence in the Y³⁺–Te⁴⁺–SO₄²⁻ system. The two compounds exhibit two new three dimensional (3D) frameworks composed of different yttrium tellurite layers bridged by sulfate tetrahedra. The tellurite groups in Y₂(Te₄O₁₀)(SO₄) polymerized together into a unique (Te₄O₁₀)⁴⁻ 1D double-strand with an eight-member polyhedral ring tunnel along the a-axis. Optical diffuse reflectance spectra showed that the two compounds present a wide energy band gap with Eg values of 4.4 and 4.1 eV respectively. The birefringence values of Y₃(TeO₃)₂(SO₄)₂(OH)(H₂O) and Y₂(Te₄O₁₀)(SO₄) were calculated to be 0.092 and 0.149 at 532 nm respectively. Furthermore, the anhydrous Y₂(Te₄O₁₀)(SO₄) features a large birefringence, wide energy band gap and high thermal stability. In addition, the IR spectrum, TG-DSC curve and theoretical calculations of the title compound were recorded in this paper.

中文翻译：

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Y2（Te4O10）（SO4）：一种新型硫酸亚碲酸盐，具有独特的Te4O10聚阴离子和大双折射

在我们的新硫酸盐勘探中，获得了两种新的硫酸钇亚碲酸盐，即Y ₃（TeO ₃）₂（SO ₄）₂（OH）（H ₂ O）和Y ₂（Te ₄ O ₁₀）（SO ₄）。 Y ³⁺ -Te ⁴⁺ -SO ₄ ^2-的双折射大。这两种化合物显示出两个新的三维（3D）骨架，该骨架由硫酸盐四面体桥接的不同钇钇亚碲酸盐层组成。Y ₂（Te ₄ O ₁₀）（SO ₄）中的亚碲酸盐基团）一起聚合成一个独特的（TE ₄ ø ₁₀）^4- 1D双链沿着八构件多面体环通道一个轴。光学漫反射光谱表明，这两种化合物呈现出较宽的能带隙，Eg值分别为4.4和4.1 eV。计算出Y ₃（TeO ₃）₂（SO ₄）₂（OH）（H ₂ O）和Y ₂（Te ₄ O ₁₀）（SO ₄）在532 nm处的双折射值分别为0.092和0.149。此外，无水Y ₂（Te ₄O ₁₀）（SO ₄）具有双折射大，能带隙宽和热稳定性高的特点。另外，记录了标题化合物的IR光谱，TG-DSC曲线和理论计算。